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 17 of 17 for “"polymer morphology"”.
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Multi-scale morphology development in solution coated conjugated polymers
… role in solution coating of conjugated polymers. On the one hand, interfacial molecular orientation and alignment critically influence the electronic performance in organic semiconductor thin films. On the other hand, the air-liquid meniscus instability lead to various coating morphology …
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Micro/nanoscale modeling of anisotropic mechanical properties of polymer/layered-silicate nanocomposites
Polymer nano-clay composites have been observed to exhibit dramatic enhancements in mechanical properties with relatively low filler loadings (1-4 percent volume fraction). These property enhancements have been speculated to be a result of the change in polymer morphology and properties within the …
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Synthesis and supramolecular assembly of biomimetic polymers
… chemistry is the synthesis of macromolecules and polymers with precise shapes and architectures. Polymer microstructure and architecture strongly affect the resulting functionality of advanced materials, yet understanding the static and dynamic properties of these complex macromolecules in bulk …
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Polymer and carbon nanotube materials for chemical sensors and organic electronics
… sites and configurational changes in the polymers. Temkin isotherm is utilized to successfully explain the relationship between the analyte concentration and sensor response. In Chapter 3, we develop a chemiresistive material based on SWCNTs wrapped with a calixarene-substituted …
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Amphiphilic block copolymer micelles : creation of functional nanocavities and their use as nanocontainers for controlled release
Block copolymers in solution can self-assemble in to a variety of morphologies, with features on the nanometer length scale. This has lead to significant recent research into this assembly process and a wide range of potential applications. The exchange of block copolymer molecules between micelles …
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Development of a Novel Drug Delivery System Based on Conducting Polymers
… improving compliance. Intrinsically Conducting Polymers (ICP) are organic materials that have electrical, magnetic and optical properties usually associated with metals, whilst retaining the advantageous mechanical properties and ease of processing usually associated with polymers. A novel drug …
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Morphology and Mechanical Properties of High Density Polyethylene Exposed to Chlorinated Water
… the effect of an oxidative environment on HDPE morphology and mechanical performance is evaluated. Extruded thin 70 micron HDPE samples (as-extruded and heat treated) are exposed to 5ppm chlorinated water at 70 degrees Celsius for up to 1250 hours. Changes in semicrystalline polymer morphology …
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A Study of Crystallization in Bisphenol-A Polycarbonate
… Bisphenol-A polycarbonate was the polymer chosen for this study because of its slow crystallization rate. With slow crystallization kinetics, the polymer morphology does not change when quenched below its glass transition temperature, enabling the study of different stages of …
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Functional Block Copolymers via Anionic Polymerization for Electroactive Membranes
Ion-containing block copolymers blend ionic liquid properties with well-defined polymer architectures. This provides conductive materials with robust mechanical stability, efficient processability, and tunable macromolecular design. Conventional free radical polymerization and anion exchange …
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Applications of room temperature ionic liquids in interfacial polymerization
… nanostructures were synthesized by interfacial polymerization (IP) with ILs without stirring. Both polymers were prepared at the interface between n-hexane and a series of 1 -alkyl-3-methylimidazolium ILs. Nanoporous or nanofibrous polymer morphologies with various sizes ranging from 50 to 500 …
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Electrochemical wiring of cyanobacteria to anodes using polymers towards biohybrid devices for solar-chemical production
… exchange efficiencies with the electrode. Polymeric mediators may be introduced at the cell-electrode interface to improve charge transfer by providing a direct route for electrons to reach the electrode, overcoming sluggish diffusional kinetics. At present, the polymer properties that are …
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Mixed Polysaccharide Esters for Amorphous Solid Dispersion Oral Drug Delivery Vehicles
… for the manufacturability of these different polymer derivatives. We incorporated different degrees of substitution of ω-carboxyl groups to impart a range of water solubility in these polymers. The derivatives displayed excellent <i>T</i>g values for ASD applications, adequate water …
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Tailoring Structure and Function of Imidazole-Containing Block Copolymers for Emerging Applications from Gene Delivery to Electromechanical Devices
… actuators, and novel monomers and polymers. The imidazole ring provides a unique building block for these applications due to its thermal stability, aromatic nature, ability to form ionic salts, and ease of functionalization. Free radical polymerization of 1-vinylimidazole (1-VIm) …
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Molecular Encapsulation of Conjugated Polymers for Organic Electronics
Conjugated polymers have been the subject of extensive research, particularly for their application in the field of organic electronics. Attributes such as their semiconducting nature, solution processability, degree of flexibility, and infinite tunability have led to their successful …
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Crystallization Behavior, Tailored Microstructure, and Structure-Property Relationships of Poly(Ether Ketone Ketone) and Polyolefins
… and chemical properties of fast crystallizing polymers. The primary objectives were to 1) utilize advanced methodologies to accurately determine the fundamental thermodynamic value of equilibrium melting temperature (Tmo) for the semi-crystalline polymer poly(ether ketone ketone) (PEKK), 2) …