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Showing 1 to 20 of 176 for “"radical polymerization"”.
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Controlled Radical Polymerization: Towards Industrially Relevant Conditions
Reversible deactivation radical polymerization (RDRP), also known as controlled radical polymerization (CRP), has been a significant area of polymer research for more than 20 years, allowing the facile synthesis of complex macromolecules previously unattainable by conventional free radical …
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Aerogels and films through free radical polymerization
… process we synthesized a bidentate free radical initiator (Si-AIBN) that gets attached on the skeletal nanoparticles and induces crosslinking by surface initiated polymerization (SIP). Here, we extend the scope of Si-AIBN in two directions: (a) we demonstrate extremely adhering, …
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Synthesis and controlled radical polymerization of multifunctional monomers
… and different protective groups were used. After polymerization the protective groups were removed by different methods. Various initiators for the NMP of the monomers were synthesized and the reaction conditions were optimized. The results showed that NMP was not a suitable method for …
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Investigation of Copper Wire-Mediated Controlled/Living Radical Polymerization
Copper wire mediated controlled living radical polymerization (CLRP) is a powerful tool that provides numerous opportunities for the development of new materials. It requires low catalyst loading and mild reaction conditions, but does involve use of organic solvents. There is a need for greener …
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Semiconductor Polymer Architectures using Click Chemistry and Controlled Radical Polymerization
Diese Dissertation beschäftigt sich mit der Synthese und Charakterisierung von halbleitenden Seitenkettenpolymeren und –blockcopolymeren für die Anwendung in organischen Photovoltaik-Bauelementen. Besonderer Augenmerk liegt dabei auf der Entwicklung und der Anwendung von modernen Synthesetechniken …
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Thermoresponsive Glycopolymers via Controlled Radical Polymerization (RAFT) for Biomolecular Recognition
Stimuli responsive polymers (SRP) have attracted a lot of attention, due to their potential and promising applications in many fields, as protein-ligand recognition, on-off switches for modulated drug delivery or artificial organs. Poly(N-isopropylacrylamide) (PNIPAM) is one of the most widely …
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Surface Modification of Nanoparticles Using Controlled Radical Polymerization For Designed Interfaces
<p> This research focuses on using controlled polymerization techniques such as Radical Addition Fragmentation Chain Transfer Polymerization (RAFT) to graft polymers from the surface of colloidal silica nanoparticles for incorporation in polymers to make composites. </p> <p>In the first part of …
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Reverse-selective gas-separation membranes prepared by atom transfer radical polymerization
… via surface–initiated atom transfer radical polymerization (ATRP). PEO has an excellent CO<sub>2</sub> solubility, but crystallization of PEO chains leads to low CO<sub>2</sub> permeability and minimal CO<sub>2</sub>/H<sub>2</sub> selectivity. To prevent crystallization, we …
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Polyethylene-based Polar Block Copolymers Preparation using Organometallic-Mediated Radical Polymerization
… The difference in reactivity required several polymerization techniques. The Co(salen) offers reactivities in mediating the polymerization of various monomers. This study addressed these challenges by employing polymer-Co(salen) complexes and conducting the synthesis of several …
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Stereochemical Effect of RAFT Agents on Kinetics of Reversible Deactivation Radical Polymerization
… at chain ends to generate propagating radicals, which initiate subsequent chain extensions. Since the effect of remote substituents on kinetics decreases rapidly with their distance from the reaction site (chain ends), propagating radicals could be assumed to be only determined by the …
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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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Investigation of nitroxide-mediated thermal and photochemical reactions of living free radical polymerization.
… in this thesis deals primarily with living free radical polymerization (LFRP). Two main specific areas of this process have been studied; thermal and photochemical reaction sequences. Stoichiometric unimolecular initiators were found to be ideal probes for studying the reactions involved in the …
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Synthesis and Characterization of Multi-Component Polymeric Materials Prepared via Free Radical Polymerization
… functionality was introduced via the copolymerization of MAH with several norbornene (Nb) derivatives that were synthesized from facile Diels-Alder cycloaddition reactions of cyclopentadiene with a-olefins containing electron withdrawing groups. Subsequent hydrolysis of the anhydride …
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Development of new dendritic ligands for copper mediated Atom Transfer Radical Polymerization (ATRP) of methyl methacrylate
… and used in copper mediated Atom Transfer Radical Polymerization (ATRP) of MMA. These ligands were derived from the commercially available Generation 1 polypropyleneimine dendrimer DAB-(NH2)4. The first set of ligands was synthesized by reacting DAB-(NH2)4 with aromatic aldehydes such as …
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Enhanced Architectural and Structural Regulation Using Controlled Free Radical Polymerization Techniques; Supramolecular Assemblies: Pseudorotaxanes and Polypseudorotaxanes
… A unique initiator bearing ATRP (atom transfer radical polymerization), cleavage, and condensation functionalities was prepared and attached to the hydrolyzed surface of silica gel. Preliminary results indicate that control of reversibly terminated grafts of varying degrees of polymerization …
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