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Full-Text Articles in Polymer Chemistry

Characterizing Flame-Resistant Polymers Using Single-Sided Nmr, Anna Tsutsui May 2019

Characterizing Flame-Resistant Polymers Using Single-Sided Nmr, Anna Tsutsui

Undergraduate Honors Theses

Many commonly used polymers are inherently flammable. Manufacturers have been able to make polymers more flame-resistant by incorporating additives in polymer matrices. Current testing methods of these materials are destructive. As a result, there is a lack of data that can characterize the long-term effects of thermal exposure on these materials. This study presents single-sided NMR as an alternative technique to characterize the physical properties of these materials before and after thermal exposure. From single-sided NMR, this study finds that it is possible to characterize the molecular behavior of flame-resistant polymers and that additives cause no significant physical change to ...


Atomic Force Microscopy Measurements Of Interfacial Forces Between Boron Nitride And Polymers For Development Of An Optimum Nano-Composite, Hall Zhang May 2019

Atomic Force Microscopy Measurements Of Interfacial Forces Between Boron Nitride And Polymers For Development Of An Optimum Nano-Composite, Hall Zhang

Undergraduate Honors Theses

Boron Nitride Nanotubes (BNNT’s) and their use in a BNNT nano-composite have been the focus of an increasing number of studies due to their theorized high thermal conducitivty (3,000 W(m•K-1)) as well as high thermal stability. One of our hopes is to integrate BNNT’s into polymer composites to transfer their strength and thermal conductivity into said composites. However, there is little information on boron nitride interfacial forces with different composite polymer resins. Here, we chose to look at nanoscale interfacial forces by functionalizing an Atomic Force Microscopy (AFM) probe cantilever with a silica bead ...


Rgd-Decorated Cholesterol Stabilized Polyplexes For Targeted Sirna Delivery To Glioblastoma Cells., Bo Lou, Kate Connor, Kieron Sweeney, Ian S. Miller, Alice C. O'Farrell, Eduardo Ruiz-Hernandez, David M. Murray, Garry P. Duffy, Alan Wolfe, Enrico Mastrobattista, Annette Byrne, Wim E. Hennink Apr 2019

Rgd-Decorated Cholesterol Stabilized Polyplexes For Targeted Sirna Delivery To Glioblastoma Cells., Bo Lou, Kate Connor, Kieron Sweeney, Ian S. Miller, Alice C. O'Farrell, Eduardo Ruiz-Hernandez, David M. Murray, Garry P. Duffy, Alan Wolfe, Enrico Mastrobattista, Annette Byrne, Wim E. Hennink

Physiology and Medical Physics Articles

The development of an effective and safe treatment for glioblastoma (GBM) represents a significant challenge in oncology today. Downregulation of key mediators of cell signal transduction by RNA interference is considered a promising treatment strategy but requires efficient, intracellular delivery of siRNA into GBM tumor cells. Here, we describe novel polymeric siRNA nanocarriers functionalized with cRGD peptide that mediates targeted and efficient reporter gene silencing in U87R invasive human GBM cells. The polymer was synthesized via RAFT copolymerization of N-(2-hydroxypropyl)-methacrylamide (HPMA) and N-acryloxysuccinimide (NAS), followed by post-polymerization modification with cholesterol for stabilization, cationic amines for siRNA complexation, and ...


Synthesis And Optimization Of Novel Poly-(Β-Amino Ester) Polymer For Gene-Delivery, Maria Montes Apr 2019

Synthesis And Optimization Of Novel Poly-(Β-Amino Ester) Polymer For Gene-Delivery, Maria Montes

Kansas State University Undergraduate Research Conference

Gene delivery is one of the most promising methods to treat multiple diseases through the alteration of a genetic code to enhance or inhibit gene expression (NIH). The potential for gene delivery to be used as a treatment for cancerous cells is the beginning for advanced personalized healthcare. Current methods for cancer are costly, nonspecific, and come with major side effects that lowers quality of life in cancer patients. Previous studies have demonstrated Poly-(β-amino ester) (PBAE) to be biodegradable, non-toxic, and capable to deliver payloads in a targeted manner. For this study, PBAE was synthesized and characterized by Nuclear ...


Development Of In Situ Forming Hydrogels For Intra-Articular Drug Delivery, Andy Prince Feb 2019

Development Of In Situ Forming Hydrogels For Intra-Articular Drug Delivery, Andy Prince

Electronic Thesis and Dissertation Repository

Hydrogels are 3-dimensional crosslinked polymer networks that can absorb significant amounts of water. The physical properties associated with hydrogels affords them resemblance to biological tissues making them good candidates for biomedical applications. Many pharmaceuticals, specifically non-steroidal anti-inflammatory drugs (NSAIDs), have poor aqueous solubility, which limits their bioavailability and efficacy. People suffering from chronic osteoarthritis (OA) are required to frequently take large doses to mitigate pain, which can lead to serious side effects. Hydrogels are good strategies to deliver NSAIDs via articular injection because they can form solid gels in situ. This thesis describes the synthesis, formulation, mechanical testing, in vitro ...


Pre-Methylation Of Lignin To Improve Storage Stability Of Oil Produced By Solvent Liquefaction, Jae-Young Kim, Parinaz Hafezi-Sefat, Sarah D. Cady, Ryan G. Smith, Robert C. Brown Jan 2019

Pre-Methylation Of Lignin To Improve Storage Stability Of Oil Produced By Solvent Liquefaction, Jae-Young Kim, Parinaz Hafezi-Sefat, Sarah D. Cady, Ryan G. Smith, Robert C. Brown

Mechanical Engineering Publications

In this study, we methylated hydroxyl groups (phenolic hydroxyl: Phe-OH and aliphatic hydroxyl: Aliph-OH) in soda lignin (SL) prior to solvent liquefaction to improve storage stability of the resulting oil. We investigated two methylating reagents, dimethyl sulfate (DMS) and dimethyl carbonate (DMC), for selective Phe-OH and total hydroxyl group (Phe-OH and Aliph-OH) blocking. Samples of SL, DMS-SL, and DMC-SL were depolymerized into oils under supercritical ethanol (350 °C). Both methylated lignins produced higher amounts of oils and smaller amounts of char compared to untreated SL due to suppressed charring reactions. Oil produced from SL had relatively higher functional group contents ...


Principles And Properties Of Rna Self-Assembly, Gabriel Tauber Jan 2019

Principles And Properties Of Rna Self-Assembly, Gabriel Tauber

Undergraduate Honors Theses

Ribonucleoprotein (RNP) granules are membraneless assemblies of condensed RNA and protein that form through multivalent interactions between the constituent components. Recently, RNA self-assembly has been shown to contribute to the formation of stress granules, which are RNP granules associated with the stress response and neurodegeneration. However, little is understood about the properties of self-assembled RNA. Here, I show that different RNA sequences can self- assemble into condensates with distinct material properties and partitioning preferences in vitro. Due to interactions that minimize surface free energy, RNA self-assembly can generate the spontaneous self-patterning of RNA assemblies. By reducing surface free energy, thereby ...


Therapeutic Delivery Technology And Its Economic Impact, Paul E. Savas Jr. Jan 2019

Therapeutic Delivery Technology And Its Economic Impact, Paul E. Savas Jr.

Senior Honors Theses

Therapeutic delivery technology is a current area of high interest in both university and industrial settings. These technologies are being developed in order to deliver therapeutic agents, such as genes, proteins, and drugs, to patients more efficiently. Nanoscale delivery vehicles have proven to be useful for these applications; these vehicles may either be naturally produced or chemically synthesized. The physical properties of these nanomaterials must be characterized correctly using instrumentation that evaluates their size, morphology, and potential for agglomeration. These technologies represent a high-growth economic area that fosters entrepreneurship and innovation. Because of this innovative spirit, research and economic interest ...


Multidimensional Mass Spectrometry Of Chemonic™ Ccg-6 Nonionic Surfactant With Separation By Polarity And Shape, Charles Johnson Jan 2019

Multidimensional Mass Spectrometry Of Chemonic™ Ccg-6 Nonionic Surfactant With Separation By Polarity And Shape, Charles Johnson

Williams Honors College, Honors Research Projects

Chemonic™ CCG-6 surfactant is a water-soluble poly(ethylene glycol) (PEG) conjugated alkyl glyceride emollient. This surfactant exists as a complex mixture of a glycerol cores conjugated with poly(ethylene glycol) branches (PEGylation) that were partially esterified with caprylic (C8) and capric (C10) acids. These may be esterified on one, two, or all three arms of the glyceride. The architecture of the structures in this mixture was studied using multidimensional mass spectrometry (MS). Mass spectrometry was interfaced with ultra-performance liquid chromatography (UPLC) and ion mobility (IM) separation. The mixture was separated by reversed-phase LC, oligomers of the star-branched polymer were separated ...


Polymerized Ionic Liquids By Condensation Polymerization: Stimuli Responsive Polyurethane Gels And Dispersions, Harshit Gupta Jan 2019

Polymerized Ionic Liquids By Condensation Polymerization: Stimuli Responsive Polyurethane Gels And Dispersions, Harshit Gupta

Master's Theses and Doctoral Dissertations

Ionic liquids have been used in free radical polymerizations to make polymerized ionic liquid (PIL) materials of various types. PIL gels based on imidazolium cations have been found to exhibit an anion-exchange induced stimuli responsiveness. This thesis explores incorporation of ionic liquids in polyurethane (PU) polymers to make PIL PU gels and dispersions through condensation polymerization. PIL gels are synthesized through a single-pot approach that show stimuli response to solvents. This approach allows one to make these gels rapidly and cheaply on-site. These gels can reversibly porate in different solvents and are found to be porous when analyzed by scanning ...


Polymerization Of Bromoundecylacrylate And Alkylating Methylimidazole, Shuziao Li Jan 2019

Polymerization Of Bromoundecylacrylate And Alkylating Methylimidazole, Shuziao Li

Master's Theses and Doctoral Dissertations

Polymerized ionic liquids (PIL) generally are solids, but a few examples have been reported that also exhibit liquidity in the neighborhood of room temperature called liquid polymerized ionic liquids (LPIL). The development of a platform suitable for exploring LPIL properties based on the monomer 11-bromoundecylacrylate (AcC11Br) was reported. Poly(AcC11Br) is itself a liquid polymer and can be easily used to alkylate 1-methylimidazole to produce poly(AcC11C1ImBr-co- AcC11Br). Various reaction conditions were explored to examine how extensively 1- methylimidazole can be attached to this polymer, and the extent of alkylation is determined quantitatively by silver ion potentiometry. These polymers retain ...


Copper Grafted Titanium Dioxide In Hydrogels For Photocatalysts, Salem Amsaaed Dec 2018

Copper Grafted Titanium Dioxide In Hydrogels For Photocatalysts, Salem Amsaaed

Electronic Theses & Dissertations Collection for Atlanta University & Clark Atlanta University

This study are based on the premise that the incorporation of metal ions into nano titania-PHEMA [poly (2-hydroxyethyl methacrylate)] hydrogels would enhance the desirable properties in the photodecomposition of pollutants. The investigation are centered in the use of Cu(II) as metal ion of interest. The development of TiO2-PHEMA-Cu hydrogels was conducted, and the characterization of the materials by FT-IR, XRD and fluorescence was performed. The absorption of copper(II) from the solution was monitored by UV-Vis. The FT-IR are found too, be the most effective tool too, analyze the interaction of Cu(II) with PHEMA in the ...


Synthesis Of Doxorubicin-Based Prodrug And Activatable Mr Nanoprobe For The Imaging And Treatment Of Cancer, Bayan Dous Dec 2018

Synthesis Of Doxorubicin-Based Prodrug And Activatable Mr Nanoprobe For The Imaging And Treatment Of Cancer, Bayan Dous

Electronic Thesis Collection

Magnetic Resonance Imaging (MRI) is increasingly being used as a diagnostic tool for cancer. We propose a novel molecular probe, Gadolinium-DTPA disulfide-bonded Doxorubicin (Gd-DTPA-SS-Doxo) encapsulated in iron oxide which could provide a dual modality for detecting malignant growth while simultaneously targeting treatment options. We first synthesized Gd-DTPA-SS-Doxo followed by encapsulation within the poly (acrylic acid) (PAA) coating of iron oxide nanoparticle (IONP), producing a nanoprobe (IO-Gd-DTPA-SS-Doxo) with quenched longitudinal spin lattice magnetic relaxation (T1). After receptor-mediated internalization, Gd-DTPA-SS-Doxo is released from the nanoprobe’s polymeric coating due to the acidic microenvironment of the tumor. When the molecular probe is subjected ...


Combination Therapy: Parp Inhibitor Synergizes The Therapeutic Efficacy Of Doxorubicin In The Treatment Of Prostate Cancer, Momin Ansare Dec 2018

Combination Therapy: Parp Inhibitor Synergizes The Therapeutic Efficacy Of Doxorubicin In The Treatment Of Prostate Cancer, Momin Ansare

Electronic Thesis Collection

Men are most susceptible to prostate cancer in the United States. The general treatment options include surgery, hormone therapy, chemotherapy, and radiation therapy. But in recent days, the nanoformulation have shown promising applications in overcoming the drawbacks of the currently available treatment options. To complement, we tried to enhance the capability of the nanoparticle formulation by loading them with a novel drug combination for the treatment of prostate cancer. Herein, we synthesized folate conjugated iron oxide nanoparticles encapsulated with doxorubicin and olaparib for imaging and targeted treatment of prostate cancer. Both drugs are approved by FDA for clinical cancer treatment ...


Polyhedral Oligomeric Silsesquioxane-Phosphate Glass Matrix Nanocomposites With Additional Chapter On Phosphate Glass-Poly(Ethylene Terephthalate) Matrix Composites, Kyoungtae Kim Dec 2018

Polyhedral Oligomeric Silsesquioxane-Phosphate Glass Matrix Nanocomposites With Additional Chapter On Phosphate Glass-Poly(Ethylene Terephthalate) Matrix Composites, Kyoungtae Kim

Dissertations

Preparation and characterization of tin fluorophosphate glass (Pglass) matrix nanocomposites incorporating polyhedral oligomeric silsesquioxane (POSS) were investigated on the structural, thermal, morphological, mechanical, and rheological properties. Various processes including synthesis, extrusion and sintering processes were applied to prepare the nanocomposite samples. Another application of POSS with hydrophobic functional groups on the well-structured nanoscale silicate cage with three silanol groups was investigated to present the feasibility to use POSS molecule as a coating material on the surface of the hydrophilic inorganic glass. In addition, Poly(ethylene terephthalate) polymer matrix composites incorporating Pglass was studied to present the benefits of the Pglass ...


High-Throughput Assessment Of A Novel, Thiol-Acrylate Hydrogel For Tumor Spheroid Synthesis In A Microfluidic Device, Nathan Daniel Kersker Nov 2018

High-Throughput Assessment Of A Novel, Thiol-Acrylate Hydrogel For Tumor Spheroid Synthesis In A Microfluidic Device, Nathan Daniel Kersker

LSU Master's Theses

The extracellular environment plays an important role in regulating cell behavior. The mechanical, structural, and compositional properties of the extracellular matrix can determine the fate of the growing cells. Standard two-dimensional culturing in a flask fails to represent a native cellular environment. To create the native environment suitable for cells, hydrogels were previously studied. One of the most extensively studied synthetic hydrogels was a poly(ethylene glycol diacrylate) (PEGDA) hydrogel. However, the need for UV polymerization may introduce unwanted changes in cell morphology and viability. The hydrogel being proposed was a form of a thiol-acrylate hydrogel that can eliminate this ...


A New Generation Of Functional Polyisobutylenes For Advanced Applications, Corey M. Parada Oct 2018

A New Generation Of Functional Polyisobutylenes For Advanced Applications, Corey M. Parada

Dissertations

Polyisobutylene (PIB) is a fully saturated, aliphatic polymer of high commercial importance due to its superior gas barrier properties and high chemical/oxidative stability. One commercial end-use for PIB is in insulated glass windows (IGU), where it acts as a gas/moisture barrier and sealant. Under certain adverse conditions, catastrophic failure of the PIB sealant may result in aesthetic and functional failure of the IGU, which necessitates replacement of the unit. Thus, there exists a need to improve current generations of thermoplastic PIB sealants to be able to withstand the harsh environments found in current real-world applications.

In the first ...


Effect Of Network Structure On Free Volume And Gas Transport Properties Of Thiol-Ene And Epoxy-Amine Networks, Ramesh Krishnan Ramakrishnan Oct 2018

Effect Of Network Structure On Free Volume And Gas Transport Properties Of Thiol-Ene And Epoxy-Amine Networks, Ramesh Krishnan Ramakrishnan

Dissertations

Network parameters such as cross-link density or intermolecular interactions were used as effective parameters to control polymer chain packing or free volume and thereby control the mass transport properties of networks.

A series of polyethylene glycol (PEG) based thiol-ene elastomeric networks having a broad range of molecular weight between cross-links, Mc, (inverse of cross-link density) was prepared. The specific volume of the networks was studied as a function of temperature and pressure using high pressure dilatometry, and the obtained PVT data was fit using Simha-Somcynsky equation of state (S-S eos) analysis. Fractional free volume, quantified through S-S eos analysis ...


Flexible And Versatile Soft Templates For Mesoporous Silicas And Organosilicas Based On Pluronic Block Copolymer Surfactants And Their Mixtures, George Farid Sep 2018

Flexible And Versatile Soft Templates For Mesoporous Silicas And Organosilicas Based On Pluronic Block Copolymer Surfactants And Their Mixtures, George Farid

All Dissertations, Theses, and Capstone Projects

In this dissertation, the work will be discussed that was focused on the synthesis of consolidated periodic mesoporous materials such as 2-D hexgonal ordered mesoporous silicas (SBA-15) as well as single-micelle-templated silica and organosilica nanotubes and nanospheres using triblock copolymer surfactants and their mixtures in the presence of a swelling agent. The introductory section, Chapter 1, will address the current state of the tunability of single-micelle-templated silica and organosilica nanotubes and will compare it with the work presented in this dissertation on the use of a dual-surfactant templating systems. Chapter 2 of the dissertation discusses transmission electron microscopy characterization of ...


Biomass Based Monomers For Synthesis Of Renewably Sourced Polymers, Anushka E. Vithanage Aug 2018

Biomass Based Monomers For Synthesis Of Renewably Sourced Polymers, Anushka E. Vithanage

Electronic Theses and Dissertations

Limited fossil resources have raised research focus on synthesizing novel, sustainable polymers and renewably sourcing existing petroleum based polymers. This work presents the synthesis and ring opening polymerization (ROP) of a new functionalized lactone monomer, methoxy-δ-hexalactone (MDHL), to yield a functionalized polyester (polyMDHL). MDHL can be renewably sourced from hydroxymethylfurfural, a renewable platform chemical. MDHL was synthesized from methyl cyclopentanone-2-carboxylate by a five-step synthesis with a global yield of 23%. ROP of MDHL was conducted with benzyl alcohol initiator, catalyzed by diphenyl phosphate. 1H Nuclear Magnetic Resonance spectroscopy verified polyMDHL chemical structure. Targeting higher molecular weights for polyMDHL by increasing ...


Chemically Cross-Linked Polysaccharide-Based Hydrogels Via Thiol-Norbornene Reaction As Sustainable Biomaterials, Nayereh Dadoo Aug 2018

Chemically Cross-Linked Polysaccharide-Based Hydrogels Via Thiol-Norbornene Reaction As Sustainable Biomaterials, Nayereh Dadoo

Electronic Theses and Dissertations

Hydrogels are 3D polymeric networks with high water content and are widely being investigated for biomedical applications such as tissue engineering. Polysaccharides have been used to fabricate hydrogels due to their natural abundance, biocompatibility, and immunogeniety. Additionally, polysaccharide-based hydrogels can provide mechanical and biological cues similar to those of the natural environments. In this work, thiol-norbornene chemistry was used to fabricate polysaccharide-based hydrogels including hyaluronic acid (HA), carboxymethyl cellulose (CMC), and cellulose nanofibrils (CNFs). Hydrogels with tunable physical and mechanical properties were achieved. The properties of these hydrogels were spatiotemporally modified by photopatterning. Also, high stem cell viability was achieved ...


Highly Conductive Solid Polymer Electrolytes: Poly(Ethylene Oxide)/Litfsi Blends, Zahra Alquraini Aug 2018

Highly Conductive Solid Polymer Electrolytes: Poly(Ethylene Oxide)/Litfsi Blends, Zahra Alquraini

Electronic Theses & Dissertations Collection for Atlanta University & Clark Atlanta University

In this study, highly ionic conductive solid polymer electrolytes have been prepared by blending high molecular weight polyethylene oxide (PEO: MW 35,000 and 100,000) and bis(trifluoromethane)sulfonamide lithium (LiTFSI) salt. The ionic conductivities were determined for several compositions of the blends at different temperatures. A maximum ionic conductivity of 9.45 x 10-6 S cm-1 at 25 °C has been obtained for the blends containing PEO-35,000/LiTFSI at an ethylene oxide to lithium salt ratio (EO/Li+) of 5, whereas a maximum ionic conductivity 7.7 x 10-6 S cm-1 at 25 ...


Thienoisatin Oligomers As N-Type Molecular Semiconductors, Natalie M. Kadlubowski, Xuyi Luo, Jianguo Mei Aug 2018

Thienoisatin Oligomers As N-Type Molecular Semiconductors, Natalie M. Kadlubowski, Xuyi Luo, Jianguo Mei

The Summer Undergraduate Research Fellowship (SURF) Symposium

Organic field effect transistors (OFETs) offer many advantages compared to traditional inorganic transistors, such as flexibility and solution processability. In this study we design and synthesize two thienoisatin-based organic semiconducting small molecules, then investigate their electronic properties in n-type OFETs. To introduce n-type charge transport, electron-withdrawing dicarbonitrile moieties were installed on thienoisoindigo and bis-thienoisatin molecules, which led to a quinoidal conjugation on thienoisoindigo, while maintaining an aromatic conjugation on the bis-thienoisatin. Following the syntheses, the molecules were characterized to determine highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels via cyclic voltammetry, as well as any potential ...


Applications Of Diels-Alder Chemistry In Polymer Synthesis, Joshua C. Stambaugh, Philip J. Costanzo, Sierra E. Gosting Aug 2018

Applications Of Diels-Alder Chemistry In Polymer Synthesis, Joshua C. Stambaugh, Philip J. Costanzo, Sierra E. Gosting

STAR (STEM Teacher and Researcher) Presentations

Diels-Alder chemistry is utilized for a myriad of commercial applications during polymer synthesis, ranging from self-healing materials to heat responsive materials to emulsion coatings. In particular, the ability to regulate and control the amount and type of functional group linkages is key component for polymer applications. A common strategy that is employed is the use of phenolic maleimide as a dienophile during Diels-Alder synthesis to control the linkages on a polymer, which determines its properties and functionality. This summer was the beginning of a project to prepare a commercial scale, water-based emulsion floor coating/polish. The first step in this ...


Development Of Mof@Polymer Composite Materials Through Bottom-Up Self-Assembly Techniques, Roberto C. Arbulu Jul 2018

Development Of Mof@Polymer Composite Materials Through Bottom-Up Self-Assembly Techniques, Roberto C. Arbulu

Chemistry ETDs

MOF-based mixed matrix membranes (MMMs) are a promising new class of MOF/polymer composite materials. Currently, fabrication of MMMs is based on top-down methods with limited control over MOF positioning, integration, or morphology. This work focuses on the growth of well-defined one-dimensional (1-D) MOF nanostructures within the pores of a nanoporous polymer template, either commercially available or through the self-assembly of block co-polymers having tailor-designed surface functionalities. Studies were conducted using zeolitic imidazole framework-8 (ZIF-8) and polycarbonate track etched (PCTE) membranes, which demonstrated the feasibility of the outlined approach, and revealed the formation of distinct super- and nanostructures with controlled ...


Electrospinning And Electrospraying Of Unsaturated Poly(Macrolatone)S: Alternative Material For Biomedical Applications., Fernando Cabral Sales De Oliveira Jul 2018

Electrospinning And Electrospraying Of Unsaturated Poly(Macrolatone)S: Alternative Material For Biomedical Applications., Fernando Cabral Sales De Oliveira

PhD theses

Chapter 1 – Introduction Lactones are a promising class of monomers which enable production of a large number of polymers with different properties. This thesis aims to investigate materials derived from the unsaturated macrolactone globalide and their processing into variable structures by electrospinning and electrospraying. The first chapter provides an overview of the polymerisation techniques, spinning and spraying technology as well as the application of aliphatic polyesters in biomedical applications.

Chapter 2 – Optimization of electrospinning process using poly(globalide). Poly(globalide) (PGl) has not be used in electrospinning to date. In this chapter the spinning conditions were optimised with the goal ...


The Effect Of Soxhlet Extraction And Synthesis Temperature On Properties Of Polyaniline, Samuel Watson Stahl Jul 2018

The Effect Of Soxhlet Extraction And Synthesis Temperature On Properties Of Polyaniline, Samuel Watson Stahl

Chemistry & Biochemistry Theses & Dissertations

Polyaniline was synthesized by the chemical oxidation of aniline in an HCl solution by ammonium persulfate. The temperature of the synthesis was varied to increase the molecular weight of the polymer from 37,600 Da to 52,400 Da. Soxhlet extraction using methanol as the primary solvent was performed on half the sample in order to further increase the average molecular weight by approximately 3150 Da and decrease the polydispersity index by 0.8. Films were cast from 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU) and N-methyl-2-pyrrolidone (NMP) and then doped with trifluoromethanesulfonic acid.

The effect of the ...


An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn Jun 2018

An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn

The International Student Science Fair 2018

In this research, an entirely new molecular glue is reported. This ‘coordination polymer glue’ is synthesized from zinc metal and BDC-NPE(2,5-bis{4-[1-(4-nitrophenyl)ethylamino]butoxy}terephthalic acid). Molecular glue transforms from 1D coordination polymer to a 3D cross-linked framework, resulting in a phase change of solution to solid. The carboxylate group of this glue makes the preformed MOF bind to its framework. Therefore, when the solution of molecular glue is mixed with preformed MOF powder and heated, homogeneous and thin MOF film – MOF/ZnNPE film – is fabricated. The film is irrelevant to the kind of its substrate ...


Glucosamine From Hydrolysis Of 3d Printing Chitosan For Osteoarthritis Treatment, Ruj Dansriboon, Laphon Premcharoen Jun 2018

Glucosamine From Hydrolysis Of 3d Printing Chitosan For Osteoarthritis Treatment, Ruj Dansriboon, Laphon Premcharoen

The International Student Science Fair 2018

This project aims to introduce a new way for osteoarthritis treatment which is expected to increase in the future. Glucosamine is the main subject for a treatment, which can be derived by hydrolyzing chitosan. This project also includes extraction of chitosan from shrimp waste to make a worthy use of food waste from industry. In this project, 3D printer is applied to print chitosan gel since 3D printing is adjustable to form various shapes of the gel.

The research process begins with the extraction of chitosan from shrimp shells. For the next step, the percent of deacetylation of chitosan was ...


An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn Jun 2018

An Entirely New Molecular Glue For Mof Using Unusual Structural Transformation Of A Coordination Polymer, Sukwoo Jung, Hangyeol Kim, Junseok Ahn

The International Student Science Fair 2018

In this research, an entirely new molecular glue is reported. This ‘coordination polymer glue’ is synthesized from zinc metal and BDC-NPE(2,5-bis{4-[1-(4-nitrophenyl)ethylamino]butoxy}terephthalic acid). Molecular glue transforms from 1D coordination polymer to a 3D cross-linked framework, resulting in a phase change of solution to solid. The carboxylate group of this glue makes the preformed MOF bind to its framework. Therefore, when the solution of molecular glue is mixed with preformed MOF powder and heated, homogeneous and thin MOF film – MOF/ZnNPE film – is fabricated. The film is irrelevant to the kind of its substrate ...