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 11 of 11 for “"polymer microstructure"”.
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Effects of Friction Stir Welding on Polymer Microstructure
… was used to examine and photograph the weld microstructure. Welds were evaluated according to 1) DVS bend angle, 2) flexural properties, and 3) weld microstructure. <p>All welds made surpassed the DVS requirements for classification as a "good weld" established for hot-gas, extrusion, and …
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Polymer Deconstructability and Recyclability via Introduction of Cleavable Si−O Bonds
… via entropy-driven ring-opening metathesis polymerization (ED-ROMP) of cyclic bifunctional silyl ether-based monomers is reported. High molecular weight polymers (up to 100 k) with narrow dispersities were achieved at modest temperature. These polymers display excellent thermal stability and …
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Enabling microscopic simulators to perform system-level analysis of viscoelastic flows
… that describes the microstructural state of the polymer. Introduction of appropriate numerical discretization and boundary conditions for these equations leads to a hybrid simulation for studying the dynamic behavior of polymeric liquids in complex geometries. This approach represents a rare …
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Effects of Fused Filament Fabrication Process Variables on Microstructural Alignment and Intra-layer Properties in PLLA
… a conventional FFF 3D printer to manipulate polymer properties during printing. In conventional macroscopic prints, first layer adhesion is prioritised. However, thin structures consisting of a single or few layers are subsequently difficult to remove from the substrate without damage. Here, …
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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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Bimetallic Main-Group Catalysts for the Synthesis of Advanced Biocompatible, Biodegradable, and Sustainable Polymers
… Among these, poly(lactic acid) (PLA) and its copolymers are especially notable for their biodegradability, sustainability, and tunable chemical and physical properties. This dissertation presents a systematic investigation into the synthesis of PLA and its copolymers with ε-caprolactone and …
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Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… regions of the semi-crystalline parent homopolymer and generates a copolymer with a blocky microstructure. Solution-state functionalization yields random copolymers which provide matched sets to the blocky analogs for fundamental investigations into the effects of polymer microstructure on …
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Living Polymerization for the Introduction of Tailored Hydrogen Bonding
… in living anionic polymerization of isoprene was used to yield well-defined chain end functional macromolecules. Using both initiating systems, polymers with good molar mass control and narrow molar mass distributions were obtained and well-defined chain end …
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Controlling the alignment and degradation of 3D printed poly-L-lactic acid for redesigned coronary stents
… PLA. This thesis explored methods to improve the polymer chain alignment and resultant Young’s modulus of 3D printed single-layer poly-L-lactic acid (PLLA). Results showed that polymer chain alignment can be increased by raising the bed temperature, lowering the nozzle temperature or increasing …
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Characterisation of drug loaded insoluble polymeric matrices prepared by hot melt extrusion technology for drug delivery applications.
… extruded solid dosage forms. Polymethacrylate polymers are frequently used within the pharmaceutical industry as film coating agents many of which offering unique pH-solubility profiles for targetted drug delivery. Eudragit RL PO and RS PO are insoluble polymers which remain intact across the …
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Microstructural and fluid transport properties of potatoes during frying
… was used for three-dimensional (3D) imaging of microstructure of porous potato discs for different frying durations. Total porosity, pore size distribution, oil content and air content of potato discs were calculated from resulting 3D data sets. Oil and air content measured by analysis of …