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.

Material for packaging light-sensitive materials

Abstract: A material for packaging light-sensitive materials including a composite sheet (laminate) of a substrate and a thermoplastic resin layer, a layer of said sheet including light-shielding materials, wherein said thermoplastic resin layer includes a surface layer and an intermediate layer which are melt-coextruded, said surface layer being comprised of thermoplastic resin of polyolefins or ethylene copolymer containing substantially no less than 95 mol % of ethylene, said intermediate layer being comprised of one or more copolymers selected from: (a) a copolymer including 7-30 mol % of acrylic ester and/or methacrylic ester with the balance being ethylene provided that the ester is comprised of an alkyl group having 1-8 carbon atoms, and (b) a copolymer (EVA) including 7-20 mol % of vinyl acetate with the balance being ethylene.

Reactive Surfactants in Heterophase Polymerization. 9.† Optimum Surfmer Behavior in Emulsion Polymerization

Abstract: In an attempt to define the conditions for the optimum use of polymerizable surfactants (surfmers), two anionic maleate surfmers were applied in various emulsion copolymerization systems including styrene/butyl acrylate/acrylic acid, vinyl acetate/VEOVA 10/acrylic acid, vinyl acetate/butyl acrylate/acrylic acid, and methyl methacrylate/butyl acrylate/vinyl acetate. It was found that the reactivity ratios were the most important variable controlling the incorporation of the surfmer into the polymer chains. The surfmer conversion also depended on the particle size: the larger the particle size, the lower the surfmer conversion. It was also found that when the surfmer copolymerized well with the monomers attaining high conversions from the beginning of the process onward, a significant part of the surfmer was buried in the particle interior, leading to unstable latexes. On the basis of the results, an optimum surfmer behavior was defined. Some preferable combinations of surfmer reactive groups and comonomer...

Two Calorimetric Glass Transitions in Miscible Blends Containing Poly(ethylene oxide)

Abstract: Miscible blends containing poly(ethylene oxide) (PEO) have been examined over the entire composition range using differential scanning calorimetry to explore further the reported presence of two glass transitions. Three systems, poly(ethylene oxide)−dimethyl ether (PEO−DME)/poly(methyl methacrylate) (PMMA), PEO/poly(lactide) (PLA), and PEO/poly(vinyl acetate) (PVAc), were chosen in order to study the effects of end-group chemistry, annealing time, and crystallinity on the calorimetric behavior of the blends. The molecular weight of PEO was kept low to minimize the interference due to crystallization. Two distinct glass transitions were observed in the mid-composition range for all three systems. The glass transition temperatures varied smoothly with blend composition between the glass transition temperatures of the two homopolymer components. It was found that the self-concentration model describes the composition dependence of these glass transitions well. Further investigation on selected PEO/PVAc blend...