Open Access. Powered by Scholars. Published by Universities.®

Polymer Chemistry Commons

Open Access. Powered by Scholars. Published by Universities.®

888 Full-Text Articles 1,250 Authors 233,906 Downloads 80 Institutions

All Articles in Polymer Chemistry

Faceted Search

888 full-text articles. Page 4 of 31.

Surface Functionalization Of Fabrics And Threads For Smart Textiles, Morgan Baima 2018 University of Massachusetts Amherst

Surface Functionalization Of Fabrics And Threads For Smart Textiles, Morgan Baima

Doctoral Dissertations

The future of electronics is moving toward wearable devices and therefore requires a shift away from hard, inflexible materials towards fibers, threads, and fabrics that conform to the shape of the body. Therefore new methods for incorporating textiles as electronic components are needed to replace conventional processing techniques used with smooth, flat substrates like glass, silicon, and many polymers. Toward this end, this work investigates different methods that can be used to tune textile surfaces for electronic functionality, including weaving, solution grafting, and initiated chemical vapor deposition (iCVD). While all of these methods were used to make triboelectrically-active textiles, iCVD ...


Light-Harvesting And Light-Responsive Materials For Optoelectronic And Biological Applications, youngju bae 2018 University of Massachusetts Amherst

Light-Harvesting And Light-Responsive Materials For Optoelectronic And Biological Applications, Youngju Bae

Doctoral Dissertations

In photodynamic therapy, several critical standards are required of photosensitizers including high singlet oxygen quantum yield, biocompatibility in dark, and long term photochemical stability. In addition, current PDT systems lack active targeting strategies to tumor cells, and instead mainly rely on the natural distribution of PS in the body following injection and application of near-infrared light treatment in the tumor region. This thesis describes a series of BODIPY-based molecules that were designed, synthesized and studied as photosensitizers with high singlet oxygen generation capacity through utilizing the heavy atom effect. Additionally, aqueous solubility and active targeting capability were introduced by photosensitizer ...


Polymeric Peptide Mimics For Protein Delivery, Coralie Backlund 2018 University of Massachusetts Amherst

Polymeric Peptide Mimics For Protein Delivery, Coralie Backlund

Doctoral Dissertations

The plasma membrane is a major obstacle in the development and use of biomacromolecules for intracellular applications. Consequently, proteins with intracellular targets represent an enormous, yet under studied avenue for therapeutics. Extended research has aimed at facilitating intracellular delivery of exogenous proteins using protein transduction domains (PTDs), which allow transport of bioactive molecules into cells. Synthetic polymers, inspired by PTDs, provide a well-controlled platform to vary molecular architecture for structure activity relationship studies. Specifically, this thesis focuses on the use of ring-opening metathesis, a facile and efficient polymerization technique, through which we can vary structural parameters to optimize delivery of ...


The Balance Between Dipole-Dipole Interactions And Steric Exclusion On Ordering In Cationic Polymers, Chinomso Nwosu 2018 University of Massachusetts Amherst

The Balance Between Dipole-Dipole Interactions And Steric Exclusion On Ordering In Cationic Polymers, Chinomso Nwosu

Doctoral Dissertations

Structure-property correlations in charged polymers is an interesting facet of polymer science. Understanding the effects of intermolecular forces on the morphologies of polymers can lead to the design of membranes with desired structures to improve properties, for example ion conductivity. In random, comb-shaped polycations, competing intermolecular forces result in two different short-range orderings. Side-chain steric repulsion results in backbone-backbone morphology characterized by periodic spacing between polymer backbones. However, dipole - dipole attraction in these polycations can facilitate the formation of ionomer cluster morphology characterized by a spacing between clustered dipoles. Although both of these short-range orderings have disparate origins, their similar ...


Synthesis Of Novel Zwitterionic Polymers: From Functional Surfactants To Therapeutics, Matthew Skinner 2018 University of Massachusetts Amherst

Synthesis Of Novel Zwitterionic Polymers: From Functional Surfactants To Therapeutics, Matthew Skinner

Doctoral Dissertations

This dissertation describes the synthesis, characterization, and investigation of novel zwitterionic polymers containing phosphorylcholine (PC), sulfobetaine (SB), and functional choline phosphate (CP) zwitterions for use as surfactants, self-assembled nanomaterials, and therapeutics. Facile, reproducible, and modular chemistries were utilized for incorporating zwitterions into a range of polymer backbones, and strategies were developed for overcoming difficult challenges encountered in zwitterionic polymer synthesis, especially related to the varying solubility of zwitterions, hydrophobic polymers, and functional comonomers. Synthetic strategies utilized in this work give access to well-defined materials with narrow molecular weight distributions, tunable compositions and architectures, and versatile chemical functionality.

Chapter 2 describes ...


Design And Synthesis Of Stimuli-Responsive Polymeric Nanogels Towards Therapeutic Translation, Mallory R. Gordon 2018 University of Massachusetts Amherst

Design And Synthesis Of Stimuli-Responsive Polymeric Nanogels Towards Therapeutic Translation, Mallory R. Gordon

Doctoral Dissertations

In the application of delivery of therapeutics, nanostructures of various composition have been employed due to their capacity to act as a host for lipophilic payloads. Advances in the synthetic preparation, size, morphology, and chemical or physical characteristics of polymers have impacted their development and versatility. A detailed understanding of polymeric nanoparticle host-guest properties is crucial to their practical translation to specific delivery applications. Further, these features must be highly tailorable to overcome biological barriers, stably encapsulate their therapeutic contexts, and exhibit payload release selectively in the target environment. In this dissertation, we aim to rationally design polymeric nano-scale assemblies ...


Zwitterionic Trivalent (Alkyl)Lanthanide Complexes In Ziegler-Type Butadiene Polymerization, Bradley M. Schmidt, Aradhana Pindwal, Amrit Venkatesh, Arkady Ellern, Aaron Rossini, Aaron D. Sadow 2018 Iowa State University

Zwitterionic Trivalent (Alkyl)Lanthanide Complexes In Ziegler-Type Butadiene Polymerization, Bradley M. Schmidt, Aradhana Pindwal, Amrit Venkatesh, Arkady Ellern, Aaron Rossini, Aaron D. Sadow

Chemistry Publications

The organolanthanide complexes Ln{C(SiHMe2)3}3 (Ln = La, 1a; Ce, 1b; Pr, 1c; Nd, 1d) react with one or two equiv. of B(C6F5)3 to yield the well-defined zwitterionic species Ln{C(SiHMe2)3}2HB(C6F5)3 (Ln = La, 2a; Ce, 2b; Pr, 2c; Nd, 2d) or LnC(SiHMe2)3{HB(C6F5)3}2 (Ln = La, 3a; Ce, 3b; Pr, 3c; Nd, 3d), respectively. These complexes are shown to contain labile, bridging Si–H⇀Ln and o-F->Ln interactions based upon the observation ...


Study Of The Effect Of Steric Bulk Of Side Chains On The Properties Of Conjugated Polymers, Bei Zhang 2018 University of Kentucky

Study Of The Effect Of Steric Bulk Of Side Chains On The Properties Of Conjugated Polymers, Bei Zhang

Theses and Dissertations--Chemistry

Donor-acceptor conjugated polymers opened a new era for conjugated polymer research due to the abundant selection and combination of different conjugated units. This class of polymers function as semiconductor materials with potential application in plastic consumer electronics. The frontier molecular orbital energies of the polymers are generally determined by the selection of donor and acceptor units in the backbone structure, and their substituents. The side chains attached to the backbone not only affect the solubility of the materials, but also their self-assembly and morphological characteristics, which indirectly govern optoelectronic properties. It is important therefore to consider backbone architectures and the ...


Multi-Dimensional Mass Spectrometry For The Characterization Of Glycopolymers, Maria Ganios 2018 The University of Akron

Multi-Dimensional Mass Spectrometry For The Characterization Of Glycopolymers, Maria Ganios

Williams Honors College, Honors Research Projects

Several glycopolymers synthesized by Activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP), were characterized by mass spectrometry to elucidate their microstructure and architecture. Analyses were performed using Matrix Assisted Laser Desorption Ionization- Time of Flight/ Time of Flight (MALDI-ToF/ToF) and Electrospray Ionization Mass Spectrometry (ESI-MS) instruments. The linear isopropylidenated glycopolymer (P65B1) analyzed with ESI-MS also was examined with multi-stage mass spectrometry (MSn) using collision induced dissociation (CID) to examine the tetramer parent ion. This glycopolymer was found to be either cyclic or linear (sans end groups) due to the data being fit for both forms ...


Functionalizing Titanium Implants With Bioactive Peptides To Increase Osseointegration, Neil Bernard 2018 The University of Akron

Functionalizing Titanium Implants With Bioactive Peptides To Increase Osseointegration, Neil Bernard

Williams Honors College, Honors Research Projects

Orthopedic surgeries have continued to increase, but the material of choice remains constant: titanium. Titanium has become the benchmark implant material due to its durability and non-immunogenic properties. However, while high rates of success are correlated with joint replacement surgery, certain patients with predisposed diseases such as diabetes or arthritis may have increased complications.1 This can be due to lack of osseointegration due to decreased bone formation and mineralization,2 which will lead to increased rates of infection or aseptic loosening of the implant from the bone. 3 Current methods to alleviate these complications include invasive revisional surgeries, which ...


Block-Copolymer Assisted Fabrication Of Anisotropic Plasmonic Nanostructures, Calbi J. Gunder 2018 Missouri State University

Block-Copolymer Assisted Fabrication Of Anisotropic Plasmonic Nanostructures, Calbi J. Gunder

MSU Graduate Theses

The anisotropic nanostructures of noble metals are of great interest for plasmonic applications due to the possibility of tuning the localized surface plasmon resonance (LSPR) across the UV-VIS-NIR without sacrificing the linewidth as well as to achieve larger local field enhancement. Here, we report a simple and promising fabrication method of anisotropic gold nanostructures film using polystyrene-b-2vinylpyridine (PS-b-P2VP) block copolymers (BCP) as a template. In this approach, PS-b-P2VP spherical micelles were first synthesized as a template followed by selective deposition of Au precursor inside P2VP core of the micelles using ethanol solution of Au salt. Subsequently, heat treatment of the ...


Construction And Evaluation Of Novel Molecularly Imprinted Polymers (Mips) Using Helical Poly(3-Methyl-4-Vinylpyridine), Fatmah Alshareef 2017 Atlanta University Center

Construction And Evaluation Of Novel Molecularly Imprinted Polymers (Mips) Using Helical Poly(3-Methyl-4-Vinylpyridine), Fatmah Alshareef

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

A novel chiral helical imprinted polymer (MIP) has been prepared by bulk copolymerization of 3-methyl-4-vinylpyridine and a crosslinker using chiral S-mandelic acid as template. The resulting MIPs after removing the template show optical activity that is derived from the presence of chiral helical structures of poly(3-methyl-4-vinylpyridine) (P3M4VP) embedded within the MIP matrix. The basic functional monomer 3-methyl-4-vinylpyridine (3M4VP) was utilized with the acidic template to ensure good interaction between the template and the polymer. Divinylbenzene (DVB) and ethyleneglycoldimethacrylate (EGDMA) with widely varying degree of rigidity, flexibility, and polarity were selected as crosslinking agents. Using two different crosslinkers, it was ...


Liquid Organic Electrolytes: Blends Of Low Molecular Weight Methoxyoligooxyethylene (Mpegs)/Litfsi Salt, Rasha Alshahrani 2017 Atlanta University Center

Liquid Organic Electrolytes: Blends Of Low Molecular Weight Methoxyoligooxyethylene (Mpegs)/Litfsi Salt, Rasha Alshahrani

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

Blends containing methoxyoligooxyethyleneglycol (MPEGs) (MW 350 and 550) and bis(trifluoromethane)sulfonimide lithium (LiTFSI) salt were prepared by solution blending process using tetrahydrofuran (THF) as a solvent. The ionic conductivity of the blends of different compositions were determined at four temperatures i.e. 25°C, 40°C, 60°C and 70°C. A maximum ionic conductivity value of 3.9x10-3 S cm-1 at 25°C was obtained for the blends containing MPEG-350 at an ethylene oxide to lithium salt ratio of 1:10. The ionic conductivity increases with increasing temperature and shows that the ion transport is aided ...


Preparation And Characterization Of Poly(Ethylene Oxide)(Mw 35k And 100k)/ Silica Nanoparticle Composites, Reem Alfinaikh 2017 Atlanta University Center

Preparation And Characterization Of Poly(Ethylene Oxide)(Mw 35k And 100k)/ Silica Nanoparticle Composites, Reem Alfinaikh

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

In recent years, polymer-inorganic nanoparticle compositions have been a subject of considerable interest in order to achieve desired chemical, physical properties and mechanical properties. In this study a polymer nanocomposites have been prepared by incorporating silica nanoparticles (~20 nm) as fillers into poly(ethylene oxide) matrix. The composites of poly(ethylene oxide) and silica nanoparticles were prepared by solution blending. The product composites were powders. The thermal properties of the composites were investigated using the Differential Scanning Calorimetry. The Nuclear Magnetic Resonance (13C solid state, T), Atomic Force Microscopy, X-ray diffraction and Fourier Transform Infrared Spectroscopy were used ...


Cellulose Nanofiber-Reinforced Impact Modified Polypropylene: Assessing Material Properties From Fused Layer Modeling And Injection Molding Processing, Jordan Elliott Sanders 2017 University of maine

Cellulose Nanofiber-Reinforced Impact Modified Polypropylene: Assessing Material Properties From Fused Layer Modeling And Injection Molding Processing, Jordan Elliott Sanders

Electronic Theses and Dissertations

The purpose of this research was to investigate the use of cellulose nanofibers (CNF) compounded into an impact modified polypropylene (IMPP) matrix. A IMPP was used because it shrinks less than a PP homopolymer during FLM processing. An assessment of material properties from fused layer modeling (FLM), an additive manufacturing (AM) method, and injection molding (IM) was conducted. Results showed that material property measurements in neat PP were statistically similar between IM and FLM for density, strain at yield and flexural stiffness. Additionally, PP plus the coupling agent maleic anhydride (MA) showed statistically similar results in comparison of IM and ...


Electrophilic Cleavage And Functionalization Of Polyisobutylenes Bearing Unsaturations In The Backbone And Synthesis Of Polymers For This Process, Christopher Campbell 2017 The University of Southern Mississippi

Electrophilic Cleavage And Functionalization Of Polyisobutylenes Bearing Unsaturations In The Backbone And Synthesis Of Polymers For This Process, Christopher Campbell

Dissertations

In the first project, we demonstrated a new reaction, which is a subset of the Friedel‑Crafts alkylation reaction, in which the alkylating carbocation undergoes a cleavage reaction prior to reaction with the aromatic substrate. This reaction was discovered by the observation that when a PIB containing a large amount of coupled fraction was subjected to a mixture of protic and Lewis acids (HCl/TiCl4) in the presence of an alkoxybenzene compound, the coupled fraction was quantitatively converted to its constituent monofunctional chains, which became functionalized by the alkoxybenzene.

In the second project, a commercial polymer, poly(isobutylene-co ...


Development Of High-Performing Polydimethylsiloxane-Based Membranes For Carbon Dioxide Separation, Tao Hong 2017 University of Tennessee, Knoxville

Development Of High-Performing Polydimethylsiloxane-Based Membranes For Carbon Dioxide Separation, Tao Hong

Doctoral Dissertations

Membrane separation is highlighted as one of the most promising approaches to mitigate the excessive CO2 [carbon dioxide] emission, due to its significant reduction of energy cost compared with many conventional separation techniques. Unfortunately, the separation performance of current membranes does not meet the practical CO2/N2 [nitrogen] separation requirements. And due to the huge volume of industrial flue gas, membranes with exceptionally high permeability are needed for practical reasons.

Currently, the separation mechanism of most polymeric membranes is based on size-sieving. However, this method is not sufficient for CO2/N2 separations due to the ...


Development And Implementation Of Redox-Active Olefin Polymerization Catalysts, William Curtis Anderson Jr. 2017 University of Tennessee, Knoxville

Development And Implementation Of Redox-Active Olefin Polymerization Catalysts, William Curtis Anderson Jr.

Doctoral Dissertations

Investigating homogeneous polymerization catalysts has been a thriving area of chemistry in the academic realm for several decades now, and has helped drive the development of a range of materials, from designer plastics to cheap commodity polymers. Billions of pounds of these materials are produced every year, which ensures that continuing research in the area will be necessary to improve current processes and enable more economic use of our resources.

This dissertation showcases the Long group’s research in homogeneous polymerization catalysis and our impact on the field thus far. We show that intelligent design of redox-active catalysts allows for ...


Synthesis And Electrochemical Characterization Of Pani/Ni And Pani/Au/Ni Composites, Morgan Emily Pacini 2017 University of Nevada, Las Vegas

Synthesis And Electrochemical Characterization Of Pani/Ni And Pani/Au/Ni Composites, Morgan Emily Pacini

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this research is to show that the electrochemically controlled formation of monometallic and bimetallic catalysts in polyaniline (PANI) can directly influence the efficiency and reproducibility of the catalytic oxidation of methanol. PANI is a conductive polymer that provides a three-dimensional template for the metallic catalysts deposition at nitrogen sites. The controlled deposition of metallic species can be achieved using the normal oxidation/reduction cycles of PANI. The deposition of metallic species relies on anion precursors that are electrostatically bound by the polymer during the oxidation cycle. The precursor is reduced directly at the nitrogen sites in the ...


The Effect Of Plant Source On Lignin-Based Polyurethanes And The Interdiffusion Dynamics Of Semi-Rigid Polymers, Jason Michael Lang 2017 University of Tennessee, Knoxville

The Effect Of Plant Source On Lignin-Based Polyurethanes And The Interdiffusion Dynamics Of Semi-Rigid Polymers, Jason Michael Lang

Masters Theses

The work reported in this thesis increases our understanding of the effect of lignin plant source on the mechanical and morphological properties of lignin-based polyurethanes and the interdiffusion of glassy/liquid bilayer thin films. The interdiffusion of glassy/liquid polymer pairs has received much less attention than liquid/liquid bilayers, leading to conflicting results and unresolved discrepancies. Therefore, the reported study of interdiffusion between polysulfone glassy/liquid polymer layers provides insight into the dynamics of these systems.

This thesis first reports the correlation between the mechanical properties of lignin-based polyurethanes and the lignin plant source. Lignin is a molecule that ...


Digital Commons powered by bepress