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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 18 of 18 for “"Polymerization kinetics"”.
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DIFFUSION CONTROLLED VINYL POLYMERIZATION
<p>It is well known that the polymerization rate and the molecular weight distribution of vinyl polymers can change markedly during the course of polymerization and that these changes are due to the influence of self-diffusion upon the termination reaction. This phenomenon is commonly referred to …
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Electrochemistry of Polypyrrole and Poly(N-methylpyrrole) and their DNA Composites.
… since the discovery of electrochemical polymerization of conducting polymers on the electrode surface. These films can be modified in order to give electrodes unique capabilities. This thesis presents an intensive study of novel conducting polymers based on the use of polypyrrole and …
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Synthesis and characterization of polydimethylsiloxane-urea segmented copolymers
… (PSX) of different molecular weights by solution polymerization. The conditions needed to synthesize well-defined and high molecular weight siloxane-urea copolymers in high yields were investigated. 2-ethoxyethyl ether (2-EEE) was a better reaction solvent than tetrahydrofuran (THF) because the …
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Predictive Modeling of Metal-Catalyzed Polyolefin Processes
… processes. Most researchers focus only on polymerization mechanisms and reaction kinetics, and neglect physical properties and phase equilibrium. Both physical properties and phase equilibrium play key roles in the accuracy and robustness of a model. This work presents the fundamental …
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Synthesis and Characterization of Tailored Macromolecules via Stable Free Radical Polymerization Methodologies
The stable free radical polymerization methodology for production of controlled macromolecules was investigated using a novel monomer, 2-vinylnaphthalene. Initial polymerizations resulted in molecular weight distributions typical of conventional free radical polymerization techniques (>2.0). …
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Effects of Poly(Catechol-Styrene) in Dental Primers and Bonding to Zirconia
… strength was shown from the shear bond tests. Polymerization kinetics of UDMA in the presence of PCS determined that PCS is possibly acting as a radical scavenger therefore, decreasing the polymerization rate. The addition of photoinitiator/co-initiator to primer formulation improved bonding, …
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A Molecular Basis for Divergent, Unstable Actin Filaments in Toxoplasma gondii
… gliding motility mechanism that is dependent on polymerization of parasite actin. However, in non-motile parasites, the majority of actin is monomeric and filaments only assemble upon initiation of gliding motility. Actin filament turnover is crucial for motility as shown by the detrimental …
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Visible Light Photocatalytic MoO3-Based Nanomaterials Synthesis, the Effect of Polymer Coatings on Their Photocatalytic Activity and Dissolution, and Their Applications in Water Treatment
… on the effects of the base nanomaterial on the polymerization of PPy and PANI, the polymerization kinetics of PPy and PANI on two different base MoO3 nanomaterials were investigated. It was determined that a higher amount of oxygen vacancies in the MoO3 base nanomaterials resulted in smaller …
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Studies of Sustainable Polymers: Novel Lignins to Reprocessable Polymers
… studies of monolignols and lignin, including polymerization and degradation. The second part reports a polymeric material that was crosslinked but can be reprocessed. In order to understand lignin from a molecular level and promote biopolymer conversion, we investigated the dehydrogenative …
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Bridging Mesoscale Phenomena and Macroscopic Properties in Block Copolymers Containing Ionic Interactions and Hydrogen Bonding
Anionic polymerization and controlled radical polymerization enabled the synthesis of novel block copolymers with non-covalent interactions (electrostatic interaction and/or hydrogen bonding) to examine the relationships between mesoscale phenomenon and macroscopic physical properties. Non-covalent …
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Development of Controlled Ring-Opening Polymerization of O-Carboxyanhydrides
… my research on the development of ring-opening polymerization (ROP) of O-carboxyanhydrides (OCAs) to synthesize functionalized, degradable polyesters. Biodegradable polyesters are promising alternatives to conventional petroleum-based non-degradable polyolefins and they are widely used in …
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Functional surface-initiated polymers: Device applications and polymerization techniques
… areas and can be patterned by combining the polymerization with soft lithographic techniques. Mobilities of organic electronic materials can also be strongly influenced by dopants in the material. In field-effect transistors the positioning of the dopant is thought to be crucial, as the …
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Polypyrrole-containing Composite Particles: Preparation, Characterization and Application
… particles by using socalled template oxidative polymerization method. As a template, water-soluble polymers, polymeric microgels, latex particles or bulk gels can be used. The morphology and properties of the composite particles can be controlled effectively by the proper use of the template. By …
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Examining Structure-Morphology-Property Relationships of Novel Styrenic-Based Macromolecules for Emerging Applications
… styrenic macromolecules using controlled radical polymerization and conventional free radical polymerization strategies, for a variety of potential applications including electromechanical devices, ionic liquids, adhesives, and lithium-ion batteries. Block copolymers have a unique architecture …
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New Purification Strategies and Monomer Platforms for Ruthenium-Initiated Living Ring-Opening Metathesis Polymerization
… Capture Purification and Ring-Opening Metathesis Polymerization In chemical spaces where difficult purifications are commonplace, innovative purification methodologies have been developed to circumvent the limitations associated with classical physiochemical property-driven purifications …
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Structure and Morphology of Photoreactive Monomer–Nanoparticle Mixtures Under Patterned Irradiation
… propagation in photoreactive media due to photopolymerization–induced rise in refractive index of the medium. Notably, LISW in polymeric materials has found use predominantly for the fabrication of optical waveguides but has not been explored in polymer–inorganic mixtures. Using through–mask …
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Fundamental Modeling of Solid-State Polymerization Process Systems for Polyesters and Polyamides
… for sound and accurate models for solid-state polymerization process systems of condensation polymers, particularly poly(ethylene terephthalate) and nylon-6. The work centers on an approach for modeling commercial-scale, as opposed to laboratory-scale, systems. The focus is not solely on …
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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 …