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 thermal properties of block copolymers were investigated with differential scanning calorimetry (DSC) and thermogravimetry, and traces showed single glass transition temperatures in between the related segments.
Abstract: Poly(glycidyl azide) (PGA) an energetic polymer and polyepichlorohydrin (PECH) were condensed with 4,4′ azobis(4-cyanopentanoyl chloride) (ACPC) to prepare macro-azo-initiators. Block copolymers containing each of these polyethers as a block segment combined with polystyrene (PS) or poly(vinyl acetate) (PVAc) have been drived by the polymerization of monomers initiated with this macro-azo-initiators. Thermal properties of block copolymers were investigated with differential scanning calorimetry (DSC) and thermogravimetry. DSC traces showed single glass transition temperatures in between the related segments of copolymers. Dynamic thermogravimetric analysis revealed the individual degradation behaviors of block segments © 1996 John Wiley & Sons, Inc.
42 citations
TL;DR: In this article, a polyvinyl alcohol/kaolinite intercalated nanocomposites (Kao-PVA) were prepared via in situ intercalation radical polymerization.
42 citations
TL;DR: In this article, six copolymers were prepared by reaction of 2-ethylhexyl methacrylate with vinyl acetate monomer by different molar ratio to produce copolymer (ν1, ν2, α, β, β and ν6).
Abstract: In the present work, six copolymers were prepared by reaction of 2-ethylhexyl methacrylate with vinyl acetate monomer by different molar ratio to produce copolymers (ν1, ν2, ν3, ν4, ν5, and ν6). The composition of these copolymers were determined by molecular weight (using Gel Permeation Chromatography (GPC) Water 600 E.) and by 1HNMR (by 300 MHz Spectrometer w-P-300, Bruker) which indicate that the copolymers are alternating copolymers with reactivity ratio of 2-ethyl hexyl methacrylate is 0.65 and vinyl acetate is 0.51. The efficiency of the prepared copolymers as viscosity index improvers for lube oil was studies. From the data obtained, it was found that the efficiency as viscosity index improvers increases by increasing the molecular weight of the prepared polymers and increasing the concentration of these copolymers. The data were discussed on light of the chemical structure and reactivity ratio of the prepared copolymers.
42 citations
TL;DR: In this paper, the authors describe the successful application of 1,3-diphosphites in the rhodium-catalysed asymmetric hydroformylation of vinyl acetate.
Abstract: Here, we describe the successful application of novel glucofuranose-derived 1,3-diphosphites in the rhodium-catalysed asymmetric hydroformylation of vinyl acetate, 2,5-dihydrofuran and 2,3-dihydrofuran. In the hydroformylation of vinyl acetate, total regioselectivity and high ee (up to 73%) were obtained. When 2,3- and 2,5-dihydrofuran were the substrates, total chemo- and regioselectivities were achieved together with ees up to 88%. These results correspond to the highest ee values reported to date in the asymmetric hydroformylation of these substrates. The HP-NMR studies of the [RhH(CO) 2 (L)] species (L=15 and 17) demonstrated that both ligands coordinate to the Rh centre in an eq-eq fashion. The complex [RhH(CO) 2 (15)] was detected as a single isomer with characteristic features of eq-eq coordination. However, the broadening of the corresponding signals indicated that this species is rapidly interchanging in solution. In contrast, complex [RhH(CO) 2 (17)] was detected as a mixture of two conformational isomers at low temperature due to the greater flexibility of the monocyclic backbone of this ligand.
42 citations
TL;DR: It was found that both the cation and anion of [bmIm]OH play important roles in the Markovnikov addition, which decrease the barrier and increase the selectivity of MarkovPutin addition.
Abstract: By performing density functional theory calculations, we have studied the Markovnikov addition of imidazole to vinyl acetate catalyzed by 1-butyl-3-methylimidazolium hydroxide, [bmIm]OH, a novel basic ionic liquid. The purpose is to show the detailed reaction mechanism, to rationalize the experimental observations, and in particular to better understand the role of [bmIm]OH played in the reaction as a catalyst. Two different reaction pathways (stepwise and concerted) have been characterized and analyzed in detail. It was found that both the cation and anion of [bmIm]OH play important roles in the Markovnikov addition, which decrease the barrier and increase the selectivity of Markovnikov addition. The present results rationalize the early experimental findings well and provide a prototype for theoretically understanding the Markovnikov addition catalyzed by room-temperature ionic liquids.
42 citations