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Showing 1 to 20 of 58 for “"free radical polymerization"”.
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Aerogels and films through free radical polymerization
… crosslinking 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 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 …
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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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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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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 …
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Composite cathodes for lithium rechargeable batteries
… periodicity of -35 nm made by atom transfer radical polymerization, and poly[(oxyethylene)9 methacrylate]-graft-poly(dimethyl siloxane) (POEM-g-PDMS) with a domain periodicity of-17 nm made by free radical polymerization. The resulting microphase-separated polymer is a structure of …
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Initiated chemical vapor deposition of functional polyacrylic thin films
… kinetics and molecular weights indicate a free radical polymerization mechanism and provide guide for vapor-phase synthesis of other vinyl monomers. The retained epoxy groups can crosslink under e-beam irradiation, resulting in e-beam patterning of iCVD PGMA thin films with 80 nm …
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Touch-and-go chemistry: development of materials for and demonstration of a contact-initiated polymerization
… benzoyl peroxide (BPO) groups which co-initiate free radical polymerizations. The mechanism by which they co-initiate requires contact between the DMA and BPO molecules. When DMA and BPO were conjugated to complementary particles, a free radical polymerization was observed following contact …
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Initiated chemical vapor deposition of fluoropolymer coatings for the surface modification of complex geometries
… methacrylate (hydrophilic). The proposed polymerization mechanism is the classical free radical polymerization mechanism of vinyl monomers. Monomer and initiator gases are fed into a vacuum chamber where resistively heated wires are used to thermally decompose the initiator molecules into …
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Construction of an Initiated Chemical Vapor Deposition (iCVD) Reactor and Deposition of Polytetrafluoroethylene (Ptfe) Thin Films Using Perfluoro-1-Octanesulfonyl Fluoride as the Initiator
… Chemical Vapor Deposition (iCVD) is a surface polymerization technique that is different from other traditional chemical vapor deposition (CVD) techniques. iCVD is carried under a vacuum without the use of solvents, therefore eliminating contaminations. An initiator and a monomer are metered …
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Oxidative Addition As A New Route To Organometallic Polymers And Dendrimers
… vinylbenzyl chloride{dollar}{rcub}{dollar}.;The free radical polymerization of the monomer 2-bromoethyl methacrylate gives the organic polymer which oxidatively adds to 1a to give a partially platinated polymer, or, alternatively, oxidative addition of the organic monomer to 1a gives the …
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Aerogels as diverse nanomaterials
… solid skeletal framework and porosity. Also, the free space can become host for functional guests such as pharmaceuticals. In chapter I, we investigated randomly mesoporous bio-compatible polymer-crosslinked dysprosia aerogels as drug delivery vehicles and demonstrated storage and release of drugs …
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Copolymerization of a P-Vinylbenzyl-Ended Poly(Oxyethylene) With Vinyl Monomers and Some Reactions of Poly(Oxyethylene) Derivatives
Controlled free radical polymerization has gained in importance in recent years because it enables one to synthesize polymers with controlled molecular weight, narrow molecular weight distribution, and well defined architectures. In this work we have studied controlled copolymerizations of …
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Magnetic Resonance Studies of Free Radicals Generation and their Impact in Different Polymers
<p>Studies of free radicals in the physics, chemistry, biology, and materials science have contributed to advancements in those fields. The presence of radicals can damage the material and system in some instances and, in some cases, they may enhance the property of the material as well. Knowledge …
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Enabling technologies for multiplexed biomolecule analysis and cell sorting
… in the synthesis of bead-patterned hydrogels, free-radical polymerization is inhibited near microfluidic channel walls due to oxygen diffusion through the porous polydimethoxysilane (PDMS) elastomer composing devices.
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Cure induced stress generation and viscoelasticity in polymer coatings.
Coatings solidified by free-radical polymerization and crosslinking (curing) reactions initiated with ultraviolet (UV) light do so quickly and at room temperature. Low viscosity monomer or oligiomer makes the use of volatile solvent unnecessary, decreasing energy use and making the process more …
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Amphiphilic BAB-triblock copolymers bearing fluorocarbon groups : synthesis and self-organization in aqueous media
… were tested for their efficiency to moderate the free radical polymerization process by polymerizing styrene (M3). Besides characterization of the homopolymers by GPC measurements, end- group analysis of the synthesized block copolymers via 1H-, 19F-NMR, and in some cases also UV-vis spectroscopy, …
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Synthesis and Characterization of Nanoporous Copolymers with Potential Gas Storage Applications
… phenyl maleimide were synthesized via free radical suspension polymerization. The incorporation of these functionalized, chain stiffening, Tg enhancing comonomers raised the Tgs of precursor polymers before they were crosslinked. Surface areas of these HCPs, obtained from nitrogen …
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