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

Polymer Chemistry Commons

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

946 Full-Text Articles 1,366 Authors 233,906 Downloads 85 Institutions

All Articles in Polymer Chemistry

Faceted Search

946 full-text articles. Page 5 of 33.

Characterization Of Polymers Containing Ferrocene And Imidazole With Density Functional Theory, Eric Mullins 2018 Pittsburg State University

Characterization Of Polymers Containing Ferrocene And Imidazole With Density Functional Theory, Eric Mullins

Electronic Thesis Collection

Electrochemical and UV-Vis studies on these polymers in the presence of aqueous solutions containing metal ions have revealed significant modifications in the electrochemical properties and absorption spectra. These modifications in electrochemical properties could be attributed to the ability of the imidazole to coordinate with metal ions, increasing its electron deficiency and enhancing oxidization of the nearby ferrocene moiety if it is in close proximity with imidazole. However, the mechanism of interaction between the imidazole and metal ions, as well as the equilibrium geometry of the resulting polymer-metal ion complex is unknown.

In this thesis, density functional theory (DFT) was used ...


Synthesis And Evaluation Of Acetylcholine Molecularly Imprinted Polymers, Nathaniel Donald Thiemann 2018 Trinity College, Hartford Connecticut

Synthesis And Evaluation Of Acetylcholine Molecularly Imprinted Polymers, Nathaniel Donald Thiemann

Masters Theses

Polymers imprinted with acetylcholine during synthesis were prepared in order to evaluate their potential for implementation as a novel recognition element in acetylcholine biosensors. Biosensors, such as the glucose monitor, are used to rapidly detect and quantify a target analyte. Acetylcholine biosensors have already been produced using enzymatic recognition elements, but they are currently expensive and plagued by short viability. Molecularly imprinted polymers are not only cheap and durable, but have also been successfully used as a recognition element in biosensors for other analytes. Therefore, computational tools were used to rationally design acetylcholine molecularly imprinted polymers. Three chemicals, itaconic acid ...


Photo-Controlled Release Of Zinc Ions In Aqueous Solution With Simultaneous Fluorescence Detection, Tyler Larson 2018 William & Mary

Photo-Controlled Release Of Zinc Ions In Aqueous Solution With Simultaneous Fluorescence Detection, Tyler Larson

Undergraduate Honors Theses

We created a system consisting of a highly fluorescent conjugated polymer nanoparticle paired with a photo-release dye. Upon irradiation at the maximum absorbance of the nanoparticle, it non-radiatively transfers its energy to the dye through the process of FRET (Fluorescence Resonance Energy Transfer), exciting the dye, which then releases a biologically relevant ion, zinc. This system enhances the photo-release process, making it kinetically faster and more efficient. The photo-event is accompanied by a change in fluorescence of the dye, allowing for simultaneous detection of photo-release. This thesis outlines nanoparticle synthesis using the reprecipitation method, synthesis of the zinc releasing dye ...


Recent Approaches In Designing Bioadhesive Materials Inspired By Mussel Adhesive Protein, Pegah Kord Forooshani, Bruce P. Lee 2018 Michigan Technological University

Recent Approaches In Designing Bioadhesive Materials Inspired By Mussel Adhesive Protein, Pegah Kord Forooshani, Bruce P. Lee

Bruce Lee

Marine mussels secret protein-based adhesives, which enable them to anchor to various surfaces in a saline, intertidal zone. Mussel foot proteins (Mfps) contain a large abundance of a unique, catecholic amino acid, Dopa, in their protein sequences. Catechol offers robust and durable adhe-sion to various substrate surfaces and contributes to the curing of the adhesive plaques. In this article, we review the unique features and the key functionalities of Mfps, catechol chemistry, and strategies for preparing catechol-functionalized poly- mers. Specifically, we reviewed recent findings on the contributions of various features of Mfps on interfacial binding, which include coacervate formation, surface ...


Higher Energy Gap Control Of Fluorescence In Conjugated Polymers, Chien-Hung Chiang 2018 Louisiana State University and Agricultural and Mechanical College

Higher Energy Gap Control Of Fluorescence In Conjugated Polymers, Chien-Hung Chiang

LSU Doctoral Dissertations

Chemo- and biosensors based on fluorescent conjugated polymer benefit from greater detection sensitivity due to amplification of the electronic perturbations produced by analyte binding. This amplification stems from the exciton-transporting properties of conjugated polymers. A conventional design paradigm relies on the analyte binding events which generate sites of lower energy relative to the polymer energy: either fluorescence quenching sites (turn-off sensors) or bathochromically shifted fluorophores (turn-on sensors). In both type sensors, the excitons migrate to the lower-energy site created by analyte binding.

This dissertation primarily focused the investigation of an alternative paradigm when analyte binding creates higher energy gap sites ...


Synthesis, Modification, Characterization And Processing Of Molded And Electrospun Thermoplastic Polymer Composites And Nanocomposites, Tamalia Julien 2018 University of South Florida

Synthesis, Modification, Characterization And Processing Of Molded And Electrospun Thermoplastic Polymer Composites And Nanocomposites, Tamalia Julien

Graduate Theses and Dissertations

This dissertation focuses on the versatility and integrity of a novel, ultrasoft polycarbonate polyurethane (PCPU) by the introduction of nanoparticles and lithium salts. Additionally, the research takes into account the use of electrospinning as a technique to create PCPU and polyimide (PI) fibers. These polymers are of interest as they offer a wide range of properties and uses within the medical and industrial fields.

An industrial batch of an ultrasoft thermoplastic polyurethane (TPU) was synthesized using a two-step process. The first was to create an end capped pre-polymer from methylene bis (4-cyclohexylisocyanate), and a polycarbonate polyol made up of 1 ...


Understanding The Functional Group-Dependent Self-Assembly And Cellular Entry Of Cationic Conjugated Polymer Nanoparticles, Prakash Manandhar 2018 Florida International University

Understanding The Functional Group-Dependent Self-Assembly And Cellular Entry Of Cationic Conjugated Polymer Nanoparticles, Prakash Manandhar

FIU Electronic Theses and Dissertations

Highly fluorescent conjugated polymers (CPs) are an important class of biomaterials used for various biological applications including labelling, sensing, and delivery of biological substances. Synthetic versatility and tunable emission make CPs a superior class of biomaterials. Understanding the structure-function relationship of CPs plays a vital role in designing high performing biomaterials. The cationic CPs are self-assembled to conjugated polymer nanoparticles (CPNs) in an aqueous environment due to their amphiphilicity. The physical and biophysical properties of CPNs are highly dependent on the chemical functionality and backbone structure of CPs. Modulation of the surface property and backbone structure of CPNs play an ...


Synthesis, Characterization, And Assessment Of Cationic Polypeptoids Toward Gene Delivery And Development Of Air Stable N-Substituted N-Thiocarboxyanhydrides, Jessica Michelle Simpson 2018 Louisiana State University and Agricultural and Mechanical College

Synthesis, Characterization, And Assessment Of Cationic Polypeptoids Toward Gene Delivery And Development Of Air Stable N-Substituted N-Thiocarboxyanhydrides, Jessica Michelle Simpson

LSU Doctoral Dissertations

Peptoids are a class of peptidomimetic polymers, which have attracted much attention over the years. Due to their structural similarity to peptides, this group of polymers affords good biocompatibility making them of interest for biomedical applications. This dissertation is largely about the design, synthesis, and characterization of cationic polypeptoids for biological applications, particularly nonviral gene delivery. The dissertation will also cover the development, characterization, and polymerization behavior of a new, air stable N-thiocarboxyanhydride (NTA) monomer.

Introducing functionality, such as small biomolecules and organic compounds can provide distinctive properties to the polymers. Chapter 1 introduces gene therapy and concepts pertinent ...


Synthesis Of Dimeric Zinc Complexes For Use As Ring Opening Polymerization Catalysts, Kyle D. Brooks, Arnlold Rheingold, David B. Green, Joe Fritsch 2018 Pepperdine University

Synthesis Of Dimeric Zinc Complexes For Use As Ring Opening Polymerization Catalysts, Kyle D. Brooks, Arnlold Rheingold, David B. Green, Joe Fritsch

Seaver College Research And Scholarly Achievement Symposium

No abstract provided.


Computational Investigation Of The Ring-Opening Homo- And Co-Polymerizations Of Lactide And Ε-Caprolactone, Diego Garcia, Benjamin Wilson, Joe Fritsch 2018 Pepperdine University

Computational Investigation Of The Ring-Opening Homo- And Co-Polymerizations Of Lactide And Ε-Caprolactone, Diego Garcia, Benjamin Wilson, Joe Fritsch

Seaver College Research And Scholarly Achievement Symposium

The mechanism for the ring-opening polymerization of lactide and ε-caprolactone is presented here with an aluminum-centered catalyst featuring a tridentate ligand and two alkoxide initiating ligands. In each homopolymerization, the addition of electron-withdrawing groups on the tridentate ligand lowers the activation energy of the reaction by increasing the electrophilicity of the central Aluminum. We further investigated the polymerizations by comparing the energy difference between copolymerization and homopolymerization following the initial ring opening as well as the potential for dual polymer chains from the insertion of both initiating ligand. Single chain polymerization is favored in every case, due to lower bond ...


Synthesis And Characterization Of Covalent Adaptable Networks Comprised Of Dynamic Imine And Aminal Covalent Bonds, Albert Chao 2018 Louisiana State University and Agricultural and Mechanical College

Synthesis And Characterization Of Covalent Adaptable Networks Comprised Of Dynamic Imine And Aminal Covalent Bonds, Albert Chao

LSU Doctoral Dissertations

The dissertation is about the design, synthesis and characterization of materials comprised of covalent adaptable networks (CANs). There are three chapters within this dissertation.

Chapter 1 contains a short overview of conventional thermosets and thermoplastics. A new strategy of combining advantages from thermosets and thermoplastics is utilizing dynamic covalent chemistry (DCC) for material design. Dynamic covalent bonds are able to undergo dynamic exchange which allow the material to adapt to a new state when under stimuli such as stress or strain. Material comprised of such reversible networks is called covalent adaptable networks (CANs). These types of reversible covalent bonds followed ...


Polymers Course For Small Colleges And Universities, Joseph Furgal 2018 Bowling Green State University

Polymers Course For Small Colleges And Universities, Joseph Furgal

Chemistry Faculty Publications

This article describes the course design and teaching methodology for a polymer chemistry and applications lecture class specifically aimed at small college and university instruction. This intermediate course for advanced undergraduates and masters level graduate students focuses on teaching the basics of polymer history, synthesis and characterization with connections to the core chemistry curriculum in a small class size environment and without a textbook. Furthermore, an extensive overview of the applications of polymeric materials gives students a connection to real life applications. The course includes polymer case studies, informational lessons on real world objects made of polymers, and demonstrations. Student ...


Functional Emulsions Via Thiol-Ene Chemistry, Douglas Amato 2018 The University of Southern Mississippi

Functional Emulsions Via Thiol-Ene Chemistry, Douglas Amato

Dissertations

Polymer particles (micro to nano) with tunable functionality have emerged as a promising and viable technology platform for applications including coatings, cosmetics, nanomedicine, and imaging. Unfortunately, the lengthy polymerization time and lack of intrinsic functionality in the monomers used to fabricate particles is an industrial challenge. Thiol-ene chemistry cirmcumvents these limitations with very rapid polymerization kinetics, high reaction yields, with supressed side reactions and inherent functionality. This dissertation demonstrates the utility of thiol-ene/yne polymerization in miniemulsion and microfluidics to generate functional materials in a one-pot-method. The functionality is typically generated via off-stoichiometry thiol-ene (OSTE) resins which allow for either ...


Controlled Folding In Precisely Functionalized Polyethylenes: Designing Nanoscale Lamellar Structures For Ion Transport, Edward Boynton Trigg 2018 University of Pennsylvania

Controlled Folding In Precisely Functionalized Polyethylenes: Designing Nanoscale Lamellar Structures For Ion Transport, Edward Boynton Trigg

Publicly Accessible Penn Dissertations

There is great societal need for improved energy storage technology, in applications ranging from electric vehicles to grid storage to emergency power systems. New polymeric membranes with enhanced ion conductivities are needed in batteries and fuel cells to improve these technologies. Despite decades of research, these membrane materials are still not adequate for commercial use. The primary metric that requires improvement is ion or proton conductivity of the membrane under desirable operating conditions.

Modifying linear polyethylene by the addition of precisely periodic functional groups leads to a rich array of intriguing morphologies and properties. Depending on the functional group chemistry ...


Enhanced Analysis Of Lignin Dehydrogenation Oligomers Via Mass Spectrometry, Amber Suzanne Bowman 2018 University of Kentucky

Enhanced Analysis Of Lignin Dehydrogenation Oligomers Via Mass Spectrometry, Amber Suzanne Bowman

Theses and Dissertations--Chemistry

Effective analytical techniques need to be developed to characterize the products of lignin degradation experiments to be able to generate renewable products from lignin. Mass spectrometry is an valuable analytical approach for lignin characterizaion, but it is hindered by lignin’s poor ionization efficiency, especially in the positive ion mode. In this work, we attempt to improve lignin’s ionization by utilizing electrospray and laser desorption mass spectrometry coupled with the addition of cations and chemical derivatives. We confronted the ionization problem from both a top-down and bottom-up analytical approach by analyzing synthesized monomers, dimers, and polymers along with natural ...


Triazole-Based Polymers Via Photo-Initiated Copper-Catalyzed Azide-Alkyne Cycloaddition, Han Byul Song 2018 University of Colorado at Boulder

Triazole-Based Polymers Via Photo-Initiated Copper-Catalyzed Azide-Alkyne Cycloaddition, Han Byul Song

Chemical & Biological Engineering Graduate Theses & Dissertations

Conventional thermosetting photopolymers are ubiquitous in a wide array of industrial applications such as UV coatings and adhesives, 3D printed objects, and dental composites, and these reactions are largely based on acrylate or methacrylate chain-growth free radical photopolymerizations. Despite the significant demand for (meth-) acrylate-based thermosets, problematic characteristics that are inherent in the nature of this polymerization still persist especially in bioapplications. For instance, incomplete conversion of monomers upon early gelation and vitrification in heterogenous networks containing hydrolytically labile ester functionalities, considerable shrinkage stress developed during polymerization, and brittleness of these highly crosslinked (meth-) acrylate-based polymers hinder both the biological ...


Synthesis, Characterization And Evaluation Of Photo/ Thermal Base Generators For Thiol-Michael Addition Polymerization Reactions, Xinpeng Zhang 2018 University of Colorado at Boulder

Synthesis, Characterization And Evaluation Of Photo/ Thermal Base Generators For Thiol-Michael Addition Polymerization Reactions, Xinpeng Zhang

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

The focus of this thesis is to develop effective methodologies to achieve spatiotemporal control over the thiol-Michael addition reaction and to enhance the fundamental understanding of this reaction as well as to broaden its applicable range. With the attributes of quantitative reaction yield, rapid reaction rate, and the ability to be conducted at mild reaction conditions, thiol-Michael click reaction acts as a powerful tool for material synthesis, bio-conjugation and polymer functionalization. Firstly, the control of the thiol-Michael addition polymerization was achieved by the development of two visible light sensitive photobase generators, namely Coumarin-TMG and MNPPOC-TMG. By measuring the photolytic efficiency ...


Synthesis Of Ordered, Phase-Separated, Organic And Metal-Containing Ionic Liquid-Based Block Copolymers Via Controlled Radical Polymerization, Zhangxing Shi 2018 University of Colorado at Boulder

Synthesis Of Ordered, Phase-Separated, Organic And Metal-Containing Ionic Liquid-Based Block Copolymers Via Controlled Radical Polymerization, Zhangxing Shi

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

Polymerized ionic liquids (PILs) are a class of polyelectrolytes that contain an ionic liquid (IL) moiety in each monomer repeating unit that are connected through a polymeric backbone. Since ILs are small-molecule liquid materials with a unique combination of properties (e.g., negligible vapor pressure, high thermal stability, ion conductivity, high solubility for certain light gases, etc.), the development of ordered, phase-separated polymeric systems containing PIL segments has considerable implications with respect to a range of transport-dependent, energy-based technology applications. The work presented in this thesis was focused on the synthesis of two IL-based block copolymer (BCPs) platforms: (1) a ...


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 ...


Digital Commons powered by bepress