Topic
Vinyl acetate
About: Vinyl acetate is a research topic. Over the lifetime, 15970 publications have been published within this topic receiving 162142 citations. The topic is also known as: Ethenyl acetate & Ethenyl ethanoate.
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TL;DR: In this paper, the cobalt complex was completely removed by filtration, as confirmed by the induction coupled plasma (ICP) analysis of the polymer before and after treatment, and it was shown that growing polyvinyl acetate chains can be end-functionalized either by adding an appropriately functionalized nonpolymerizable olefin or by displacement of the Co(acac)2 moiety by a functionalized nitroxide.
Abstract: Poly(vinyl acetate) (PVAc) chains prepared by cobalt-mediated radical polymerization in the presence of cobalt(II) acetylacetonate (Co(acac)2) were quenched by radical scavengers, such as thiol compounds and nitroxides, to displace the covalently bonded Co(acac)2 moiety and to end-cap them with a reactive group. The cobalt complex was completely removed by filtration, as confirmed by the induction coupled plasma (ICP) analysis of the polymer before and after treatment. Growing poly(vinyl acetate) chains can be end-functionalized either by addition of an appropriately functionalized nonpolymerizable olefin or by displacement of the Co(acac)2 moiety by a functionalized nitroxide. This strategy allows PVAc to be synthesized with a predictable molecular weight, a reasonably low polydispersity (Mw/Mn ∼ 1.1−1.3), and a functional ω end group, e.g., hydroxyl and epoxy.
104 citations
TL;DR: In this paper, a resistance-based humidity sensor was proposed using polyaniline with either polyvinyl alcohol or a butyl acrylate/vinyl acetate copolymer.
Abstract: Polyaniline was blended with either polyvinyl alcohol or a butyl acrylate/vinyl acetate copolymer and used as a sensing medium in the construction of a resistance-based humidity sensor. The design utilised 125 μm polyester-insulated platinum wire as conducting electrodes that were dip-coated in conducting polymer. The sensors had an overall final thickness of less than 150 μm and showed high sensitivity, low resistance, and good reversibility without hysteresis. Some drift in the response was attributed to slow oxidation of the polyaniline that could be reduced by the application of appropriate barrier coatings.
103 citations
01 Jan 2004
TL;DR: In this article, the MADIX/RAFT polymerization mediated by xanthates was used to create poly(vinyl alcohol) stars, which showed living characteristics with molecular weight increasing with conversion.
Abstract: Poly(vinyl acetate) stars were prepared using MADIX/RAFT polymerisation mediated by xanthates. The polymerisation shows living characteristics with molecular weight increasing with conversion. The subsequent hydrolysis of these three and four arm stars led to the formation of poly(vinyl alcohol) stars.
103 citations
Patent•
12 Apr 1976TL;DR: A surface impregnated catalyst consisting essentially of a catalyst support, a palladium-gold alloy distributed in a surface layer of the catalyst support extending less than about 0.5 millimeter from the surface, and alkali metal acetate are provided as discussed by the authors.
Abstract: A surface impregnated catalyst consisting essentially of a catalyst support, a palladium-gold alloy distributed in a surface layer of the catalyst support extending less than about 0.5 millimeter from the surface, and alkali metal acetate are provided. The catalyst has substantially higher specific activity than prior art catalysts used for the production of vinyl acetate.
102 citations
TL;DR: In this paper, the synthesis of vinyl acetate by vapor phase oxidation of ethylene-acetic acid mixtures has been studied using catalysts prepared by palladium deposition on silica or alumina supports.
102 citations