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 43 for “"polymer properties"”.
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Impact of end groups of PLGA on polymer properties and ocular implant performance
… of current therapies questionable. Biodegradable polymeric implants offer potential for exact drug delivery at the intraocular target site. The FDA‑approved PLGA has been investigated for implantable ocular dosage forms. From a manufacturing stand point, the copolymer provides several merits. …
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Property-Process-Property Relationships in Powder Bed Fusion Additive Manufacturing of Poly(phenylene sulfide): A Case Study Toward Predicting Printability from Polymer Properties
… paradigm common to all types of AM, polymer PBF shows potential for significant industrial relevance through exploiting the technique's characteristic powder-filled bed (a.k.a. build piston) to utilize the full printer volume for batch-style production. Although PBF should be a …
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Synthesis, Characterization, Processing and Physical Behavior of Melt-Processible Acrylonitrile Co- and Terpolymers for Carbon Fibers: Effect of Synthetic Variables on Copolymer Synthesis
… novel photocrosslinkable and melt processible terpolymer precursor for carbon fibers has been successfully synthesized and characterized. The terpolymer was synthesized by an efficient emulsion polymerization route and has a typical composition of acrylonitrile/ methyl acrylate/acryloyl …
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Structure-Property Relationships of Polyester Regioisomers and Pendant Functionalized Polyetherimides
Step-growth polymerization enabled the synthesis of novel polyester regioisomers and pendant functionalized polyetherimides (PEI)s. Novel monomers incorporated at targeted mol % produced series of polyesters and PEIs, suitable for systematic analysis of key polymer properties. Subsequent …
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Oral Drug Delivery -- Molecular Design and Transport Modeling
… on the biopharmaceutical and pharmacokinetic properties. This helps in precipitating early development failures in the early drug discovery and candidate selection processes and reduces the rate of late-stage failures, which is more expensive. In our research, we successfully integrated two …
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A Study of Polymer-Small Molecule Interactions for Solid-Liquid Two Phase Partitioning Bioreactors With Emphasis on the Bioproduction of 2-Phenylethanol
… alternative is a solid-liquid system in which polymer beads are used, absorbing and removing target compounds from the aqueous phase while maintaining equilibrium conditions. In such systems, the capability of a polymer to absorb the compound of interest is an important parameter. This work has …
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Properties of Absorbent Polymer Extractants for the Selective Removal of Target Molecules from Fermentation Systems
This thesis investigated polymer properties for their application as extractants in two-phase partitioning bioreactors (TPPBs), which are intended to remove inhibitory fermentation products as they are produced. Three applications of polymer TPPB extractants were studied, followed by an …
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Determination of Wear in Polymers Using Multiple Scratch Test.
… an important phenomenon that occurs in all the polymer applications in one form or the other. However, important links between materials properties and wear remain illusive. Thus optimization of material properties requires proper understanding of polymer properties. Studies to date have …
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A Model for Abrasive Polymer Wear
The abrasive mechanism of polymer wear is dominant in the startup, or "breakin", stage of polymer/steel sliding systems. This mechanism controls the polymer wear rate until the voids in the hard metal surface are filled, much like the filling observed with a file when used on soft metals. This …
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pH-Responsive Polymers for Biosurfaces: An Investigation of Solution Properties and Surface Modifying Performance
<p>Gantrez® copolymers are used widely in the personal care industry, but their mechanisms of interaction with dental surfaces are poorly understood. In this study, we determined a number of the solution and polymer properties that control deposition, adsorption and adhesion in Gantrez® polymer …
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ENHANCING POLYMER INFORMATICS: A STUDY ON THE IMPACT OF FINGERPRINTING METHODS AND MACHINE LEARNING MODELS
… design and selection require accurate polymerproperty prediction. This study will evaluate machine learning model performance prediction accuracy using single-task and multi-task learning methods. We examined eight polymer properties and added polymer genome (PG) fingerprints to Morgan …
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High-throughput platforms for investigating bioadhesion and cell migration
… acrylamide) brushes. Large format polymer gradients were used to screen grafting densities and substrate chemistries that alter both cell adhesion and rapid, reversible release by switching temperature. The study demonstrated the interplay between protein adsorption mechanisms, …
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Critical thickness in silicone thermosets
… to achieve high fracture toughness in brittle polymers. The postulate of critical thickness, which is: "Macroscopically brittle polymers deform in a ductile fashion below a critical dimension" is validated for silicone thermosets and polystyrene using novel "direct" methods by measuring failure …
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Anionic synthesis and characterization of alkyl methacrylate containing polymeric systems
… with the ester functionality during anionic polymerization. However, by very carefully controlling various synthetic parameters and utilizing rigorously purified monomers, one can take advantage of the "living" nature of this polymerization to synthesize a variety of well-defined polymeric …
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Quantitative Analysis of Additives in Low Density Polyethylene Using On-line Supercritical Fluid Extraction /Supercritical Fluid Chromatography
Polymer additives exemplify many classes of compounds which possess a wide variety of chemical (i.e., phenols, amides, esters) and physical (i.e., volatility, solubility) properties. They are incorporated into polyolefins and other such polymeric materials for a number reasons: (a) to prevent …
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Implementation of Chemical Flooding Module into the General Purpose Adaptive Simulator
… species added to the simulator were tracer, polymer and surfactant. The methodology adopted was to treat each of these species as an aqueous component with special properties calculated in a chemical module. This chemical module takes into account the flux across each grid interface, the …
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Synthesis and characterization of phosphorus containing poly(arylene ether) systems
… along the backbone were investigated and unique properties derived from the presence of this moiety were identified. The preparation of crucial phosphine oxide containing monomers which would be susceptible to the desired nucleophilic aromatic substitution polycondensation was achieved via …
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Regulated release of a novel non-viral gene delivery vector from electrospun coaxial fiber mesh scaffolds
… tissue engineering entails the evolution of biopolymers into multifunctional constructs that can support the proliferation of cells and stimulate their differentiation into functional tissues. With that in mind, biocompatible polymers were fabricated into a novel gene delivery agent as well as …
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Two-Dimensional and High-Throughput Electrophoretic Separation of Proteins Using Polymeric Microchips
… play in cellular functioning and drug discovery. Polymeric microchips possess a variety of physiochemical properties to match the intended application and their ease of fabrication increases the accessibility of technology to a large research base. In this dissertation, a comprehensive 2-D …
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