Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"polymer architecture"”.
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Polymer architecture effects on mechanochemical reactions
Long chain polymers have a unique ability to become highly extended in elongational flow fields. The forces developed along the backbone give rise to scission of the chains near their center. Recently, this unique property of polymers has been adopted to explore new chemical transformations by …
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Engineering approaches to control polymer architecture
The synthesis of well-defined polymers offers great potential for improving society as there is nearly an infinite spectrum of tailored materials that can be made. Traditionally, the polymer community has mainly focused on purely chemistry driven methods for controlling polymer molecular weight, …
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The control of polymer architecture and composition through kinetic studies
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Fundamental and applied studies of polymeric photonic crystals: the role of polymer architecture and 3D printing
Block copolymers (BCP) provide a bottom-up, economical approach to synthesizing polymeric photonic crystals (PC) through the process of self-assembly. Photonic crystals (PC) are defined as periodic, dielectric nanostructures able to reflect certain wavelengths of light within a photonic band gap. …
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Comb Polymer Architecture and Particle Size Effects on the Behavior of Biphasic Nanoparticle Inks for Direct -Write Assembly
Finally, the printing behavior of biphasic nanoparticle inks is investigated as a function of attractive-to-repulsive volume fraction and particle size ratio. Ink flow behavior is characterized by extrusion measurements, which reveals that the suspension viscosity, and, hence, pressure drop within …
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Large Polymers that Behave Like Small Polymers
Polymer architecture dictates the physical properties and therefore the function of a material. Consequently, structural changes in the polymer backbone have drastic influences on macromolecular physical properties. For example, rigid monomer units create stiff polymer chains with excellent thermal …
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Synthesis and Characterization of Novel Polymers for Functional and Stimuli Responsive Silicon Surfaces
… synthesis of a variety of novel functionalized polymers using living polymerization techniques to achieve functional and stimuli responsive coatings on silica surfaces are described. Since microscopic features on a surface influence the overall wetting properties of the surface, a systematic …
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Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films
Amphiphilic comb-type graft copolymers comprising a poly(methyl methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, resulting in quasi-2D confinement of the backbone at the immediate surface. The …
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Developing Materials for Rare-Earth–Element Chelation: Synthesis, Solution Thermodynamics, and Applications
… are in ever-increasing demand. Metal-chelating polymers have great potential in these applications due to their relatively low cost and high affinity for target elements. However, while much research has focused on specific ligands attached to polymers, little is known about the effect of …
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Mechanical and optical characterization of force induced chemical reactions in solid state linear polymers
… chemical species (mechanophores) into polymer backbones, mechanical force can drive chemical reactions. Mechanophores have been developed with potential as damage sensing, self-healing, and self-reinforcing materials. This research investigates the conditions for promoting mechanophore …
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Hierarchical control of hydrogel dynamics via choice of ligand chemistry
… from the choice of metal chemistry and polymer architecture via choice of ligand chemistry and that this choice can be guided by the activation energy barrier for the dissociation of the metal-ligand complex. In addition, the range of accessible gel dynamics can be further expanded by …
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Correlation of Polymer Performance and Hansen Solubility Parameters
… without going beyond critical PVC (CPVC).</p> <p>Polymer architecture was also determined to be extremely important, but difficult to predict. Properties such as tensile strength and elongation can be adequately modeled by polymer T<sub>g</sub>, however, T<sub>g</sub> alone is not a good predictor …
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From Nanoplates to Bottlebrushes: Engineering Thermodynamics in Polymer Nanocomposites
Polymer nanocomposites (PNCs) represent a diverse class of materials where manipulating design parameters is crucial for tailoring material properties. Of utmost importance for nanocomposites is nanoparticle dispersion, which is affected by the nanoparticle itself as well as the overall polymer …
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A 'Toolkit' of Small Molecules for Polymer Assembly and Post-Synthetic Modification Using 'Click' and Photoactive Chemistries
… toward the goals of constructing and modifying polymeric materials according to simple, generalizeable, and universal processes. The prepared compounds rely upon a combination of photochemistry and the 'click' philosophy to alter the architecture, bulk properties, or surface chemistry of …
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Additive Manufacturing of Commercial Polypropylene Grades of Similar Molecular Weight and Molecular Weight Distribution
… manufacturing (AM). However, semicrystalline polymers, such as polypropylene (PP), have limited commercial use in MEAM processes in the past due to their rapid crystallization kinetics and the subsequent effect on the integrity of the generated structures. The rapid crystallization of PP can …
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Synthesis of novel methacrylate-containing polymers by anionic polymerization
The advent of anionic "living" polymerization in the late 1950’s lead to developments in synthetic control not yet approached by other polymerization mechanisms. Parameters such as molecular weight, molecular weight distribution, stereochemistry, chain end functional groups, polymer architecture …
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Design and development of Brush-Arm Star Polymers for applications in drug delivery
… thesis describes the development of a unique polymer architecture - the Brush-Arm Star Polymer (BASP) - that represents a modular, customizable therapeutic platform with potential in drug delivery. In this thesis, BASPs are synthesized by ring opening metathesis polymerization (ROMP) of a …
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A Simulation Approach to Thermodynamics in Interfacial Phenomena
… such as production of high performance polymer-nanocomposites, semiconductor fabrication, and catalysis involve molecular level phenomena governed by interfacial interactions. Precise control of these interactions will leverage the performance of materials in these applications. However, …
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Development of thermal field-flow fractionation for the characterization of hybrid nanoparticles and polymers with complex architecture
… for not only separation of nanoparticles and polymers but also as a characterization tool to obtain physiochemical distributions. Thermal FFF is unique as the separation mechanism is based on the differential transport of analytes in the presence of a temperature gradient. This thermophoresis …
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Bio-inspired Design and Self-Assembly of Nucleobase- and Ion-Containing Polymers
… ionic group allowed synthesis of supramolecular polymers using free radical polymerization and controlled radical polymerization techniques. Comprehensive investigations for the structure-property-morphology relationships of these supramolecular polymers elucidated the effect of noncovalent …
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