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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 14 of 14 for “"chain transfer agent"”.
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Copolymerizing Acrylonitrile and Methyl Acrylate by RAFT for Melt Processing Applications: A Synthetic Investigation of the Effects of Chain Transfer Agent, Initiator, Temperature, and Solvent
… using reversible addition-fragmentation chain transfer (RAFT) copolymerization. A typical copolymer was charged with 15 wt. % MA content. This thesis describes a systematic variation of the RAFT copolymerization variables to optimize this system. In particular, the effects of chain …
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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
… the system. In particular, the effects of chain transfer agent, initiator, and surfactant concentration on the polymer properties were studied.
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Developing green processes for the conversion of biobased materials into pyrones
… with reversible addition fragmentation chain transfer RAFT polymerization by the development of macro-chain transfer agent. The conversion of anionic polystyrene to block acrylic copolymers had an efficiency as high as 97%. This was completed by coupling -bromoisobutryl bromide, …
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Controlling the end groups and rates of catalytic polymerization
… synthesized through multiple methods including chain transfer polymerization. Chain transfer polymerization involves a catalyst that is capable of polymerizing a monomer, reacting with a chain transfer agent to cleave the polymer chain from the catalyst, and reinitiate the growth of a new …
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Ion containing copolymers via the emulsion copolymerization of polar and ionic vinyl monomers
… be particularly rapid. With the proper choice of chain transfer agent soluble polymers with enhanced rubbery plateaus have been synthesized. The best conditions for the polymerizations were a reaction temperature of 70°C and reaction times up to 8 hours with TWEEN 20 used as the emulsifier. …
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Novel Precursors for Polymer-Protein-Conjugate Synthesis via Reversible Addition-Fragmentation Chain Transfer Polymerization
… of N-isopropylacrylamide with two different chain transfer agents, namely benzyl 1-pyrrolecarbodithioate and cumyl 1-pyrrolecarbodithioate, yielded polymers with narrow molecular weight distributions as well as Mn values that were in good agreement with the calculated ones. A comparison …
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Dendronized Amphiphilic Copolymers Synthesized from Methacrylate Derivatives as Potential Topical Microbicides
The need for a preventative agent to curtail the rampant spread of HIV, other STDs and mucosal pathogens is urgent. Topical microbicides based on amphiphilic compounds have been identified as an attractive means toward this goal. Novel dendritic methacrylate macromonomers––di-tert-butyl …
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Investigation Of Parameters Enabling Admicellar Reversible Addition-Fragmentation Chain Transfer (Raft) Polymerization
… early termination and increases the rate of dead chain formation. Admicellar polymerizations using the water-soluble initiator exhibited higher Mw polymer compared to the systems using the water-insoluble initiator due to less degree of partitioning of water-soluble initiator in the admicelle …
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Imidazole-Containing Polymerized Ionic Liquids for Emerging Applications: From Gene Delivery to Thermoplastic Elastomers
… Nitroxide-mediated polymerization (NMP) and atom transfer radical polymerization (ATRP) failed to control 4VIM homopolymerizations; however, reversible addition-fragmentation chain transfer (RAFT) demonstrated unprecedented control. Linear pseudo-first order kinetics were observed and successful …
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Design, Synthesis and Application of Cylindrical Polymer Brushes: From Nanostructures to Advanced Materials
… CPBs via reversible addition-fragmentation chain transfer (RAFT) polymerization, designed and prepared complex functional CPBs for light-harvesting and energy transfer, and utilized CPBs as templates for the synthesis of novel one-dimensional (1D) organic/inorganic hybrid nanostructures. The …
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Syntheses and characterization of copper(I) complexes for study of dynamic supramolecular ring-chain equilibria and application as photoredox catalysts
… was induced to partake in a dynamic ring-chain equilibration in the presence of an acyclic chain transfer agent, with bulky chain ends, to yield a copper-chelated [2]rotaxane. A catalytic olefin metathesis was utilized to effect the dynamic ring-chain equilibration with an accompanying …
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Linear and Cross-linked UCST-Type Polymers : Synthesis and Properties
… of polymer characters such as composition, chain ends and molar mass on the UCST behavior; (2) chemistry for grafting polymers with UCST-type thermoresponsivity onto metal nanoparticles; (3) UCST-type volume changes of chemically cross-linked hydrogels; and (4) photo cross-linkable polymer …
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AB DIBLOCK COPOLYMER NANOPARTICLES VIA RAFT-MEDIATED POLYMERIZATION AS A PSEUDOSTATIONARY PHASE FOR ELECTROKINETIC CHROMATOGRAPHY
… utilizing the Reversible addition−fragmentation chain-transfer polymerization (RAFT) process, have overcome the aforementioned problems. This study furthers the research of latex nanoparticles as PSPs. 2-Acrylamido-2-methylpropane sulfonic acid (AMPS) was chosen as a novel ionic nanoparticle …
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AB DIBLOCK COPOLYMER NANOPARTICLES VIA RAFT-MEDIATED POLYMERIZATION AS A PSEUDOSTATIONARY PHASE FOR ELECTROKINETIC CHROMATOGRAPHY
… utilizing the Reversible addition−fragmentation chain-transfer polymerization (RAFT) process, have overcome the aforementioned problems. This study furthers the research of latex nanoparticles as PSPs. 2-Acrylamido-2-methylpropane sulfonic acid (AMPS) was chosen as a novel ionic nanoparticle …