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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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Journal ArticleDOI
TL;DR: In this paper, the authors explored a novel avenue to glycopolymer-block-poly( vinyl acetate) polymers by a combination of reversible addition fragmentation chain transfer (RAFT) chemistry and Huisgen 1,3-dipolar cycloaddition under mild reaction conditions.
Abstract: The present communication explores a novel avenue to glycopolymer-block-poly( vinyl acetate) polymers by a combination of reversible addition fragmentation chain transfer ( RAFT) chemistry and Huisgen 1,3-dipolar cycloaddition (i.e., so-called 'click' chemistry) under mild reaction conditions. Such block copolymers are - because of the strongly disparate reactivity of the two monomers - otherwise not obtainable. Poly( vinyl acetate) that has an azide end group (M-n 6800 g mol(-1), PDI 1.15) was treated with poly(6-O-methacryloyl mannose) (M-n 7600 g mol(-1), PDI 1.11) in the presence of 1,8-diaza[5,4,0] bicycloundec-7-ene and copper(I) iodide. The resulting poly( vinyl acetate)- block-poly( 6-O-methacryloyl mannose) had a number-average molecular weight of 15 400 g mol(-1) and a PDI of 1.48, which indicates that while the cycloaddition had occurred the resulting polymer distribution featured a considerable width. The resulting slightly amphiphilic block copolymer was subsequently investigated with regard to its self-assembly in aqueous solution. Dynamic light scattering studies indicated a hydrodynamic diameter of close to 200 nm. Transmission electron microscopy studies indicate the formation of rods as well as spheres with transitions between these two phases. However, the segregation between core and shell in the spheres is not pronounced; such behaviour is expected for weakly amphiphilic block copolymers.

78 citations

Journal ArticleDOI
TL;DR: In this article, the thermal degradation of pure ethylene-vinyl acetate copolymer (EVA, 12% vinyl acetate) and electron beam radiation-cured EVA, cured in the presence of a small amount of sensitizer, has been studied by non-isothermal thermogravimetry and infrared spectroscopy.

78 citations

Journal ArticleDOI
TL;DR: In this article, the authors reported new acid/base switchable N-aryl-N-pyridyl dithiocarbamates (R = −CH2CN, Z = −N(Py)(Ar)) which vary in substituent at the 4 position of the aryl ring and the use of these to control molecular weight and dispersity.
Abstract: The structures of the “Z” and “R” substituents of a RAFT agent (Z–C(S)S–R) determine a RAFT agent’s ability to control radical polymerization. In this paper we report new acid/base switchable N-aryl-N-pyridyl dithiocarbamates (R = −CH2CN, Z = −N(Py)(Ar)) which vary in substituent at the 4-position of the aryl ring and the use of these to control molecular weight and dispersity. In their protonated form, the new RAFT agents are more effective in controlling polymerization of the more activated monomer, methyl acrylate (MA), whereas in their neutral form they provide more effective control of the polymerization of less activated monomers, N-vinyl carbazole (NVC) and vinyl acetate (VAc). For each polymerization, the apparent chain transfer coefficient (Ctrapp) shows a good correlation with Hammett parameters. Dithiocarbamates with more electron-withdrawing aryl ring substituents have the higher Ctrapp. This demonstrates the influence of polar effects on Ctrapp and supports the hypothesis that the activity of...

78 citations

Journal ArticleDOI
TL;DR: Capillary column inverse gas chromatography (CCIGC) has been used for the measurement of diffusion coefficients in polymer-solvent systems at conditions approaching on a solvent diffusion in two polymers, poly(methyl methacrylate) (PMMA) and poly(vinyl acetate) (PVAc) as mentioned in this paper.
Abstract: Capillary column inverse gas chromatography (CCIGC) has been used for the measurement of diffusion coefficients in polymer-solvent systems at conditions approaching on a solvent diffusion in two polymers, poly(methyl methacrylate) (PMMA) and poly(vinyl acetate) (PVAc, measuremnets of diffusion coeffiients were made at temperatures ranging from T g to 70 K above T g . Over 30 solvents were evaluated: alkanes, alkenes, aromatic hydrocarbons, and aliphatic esters.

77 citations

Journal ArticleDOI
TL;DR: In this article, thermoplastic elastomers from blends of ethylene-vinyl acetate copolymer and polypropylene have been prepared by melt blending in a Brabender Plasticorder.

77 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202389
2022142
2021157
2020199
2019277
2018351