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, a branched polyvinyl alcohol (PVOH) is synthesized via conventional free radical copolymerization of vinyl acetate (VAc) and triallyl-triazine-trione (TTT), in 2-isopropoxy ethanol (IPE) solvent in the presence of appropriate thiol free radical chain transfer agents, followed by alcoholysis of the so-formed branchered poly(vinyl acetates)s (PVAcs) with methanol.
Abstract: Poly(vinyl alcohol) (PVOH) is a ubiquitous synthetic polymer that finds widespread application in biological and medical products through to personal, domestic, and industrial products. The currently available range of materials all have linear backbone architectures with interesting solubility, rheological, and interfacial properties. The latter might be significantly broadened if complementary polymers with branched backbone architectures could be synthesized, especially if the methodology involved only minor changes from that currently practiced. We have now synthesized branched PVOHs via conventional free radical copolymerization of vinyl acetate (VAc) and triallyl-triazine-trione (TTT), in 2-isopropoxy ethanol (IPE) solvent in the presence of appropriate thiol free radical chain transfer agents, followed by alcoholysis of the so-formed branched poly(vinyl acetates)s (PVAc)s with methanol. Balancing the mole ratio of TTT to thiol allows high conversion to branched materials to be achieved while inhibiting cross-linking and gelation of the products. The branch points derived from the TTT comonomer have been shown to be conserved during the alcoholysis step, and extensive characterization of the PVAc precursors and the derived PVOHs using multiple detector size exclusion chromatographic (SEC) instrumentation has confirmed the highly branched nature of both groups of polymers. Final confirmation of the branched architecture of the PVOH samples has been made by reacetylation of some samples, in effect to regenerate their PVAc precursors. SEC analysis of the latter has indeed shown these to be architecturally very similar to the original precursor PVAcs. This novel methodology for synthesizing branched PVOHs involves relatively minor adjustments to the currently used industrial process for linear PVOHs and so offers good prospects for scale-up and exploitation.
60 citations
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60 citations
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TL;DR: Immobilization of Candida cylindracea lipase by covalent linkage involving the Iµ-amino residues of lysine leads to a five-fold increase of selectivity which is entirely preserved against deactivation caused by acetaldehyde, an unavoidable by-product in acyl transfer reactions with vinyl acetate.
Abstract: Immobilization of Candida cylindracea lipase by covalent linkage involving the Iµ-amino residues of lysine leads to a five-fold increase of selectivity which is entirely preserved against deactivation caused by acetaldehyde, an unavoidable by-product in acyl transfer reactions with vinyl acetate.
60 citations
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TL;DR: Bis(triarylphosphite) ligands 1−4 were prepared in optically pure forms from (R)- or (S)-binaphthol and (ArO) 2 PCl, and their Rh(I) complexes have been used as catalysis for hydroformylation of vinyl acetate as discussed by the authors.
Abstract: Bis(triarylphosphite) ligands 1–4 were prepared in optically pure forms from (R)- or (S)-binaphthol and (ArO) 2 PCl, and their Rh(I) complexes have been used as catalysis for hydroformylation of vinyl acetate. The corresponding branched aldehyde, 2-acetoxypropanal, was given in up to 95% regioselectivity and in 49% ee.
60 citations
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25 Jul 1991
TL;DR: In this article, a dynamically vulcanized composition is provided which comprises a polyolefin resin, an elastomer, and an ethylene copolymer resin such as a copolymers of ethylene and vinyl acetate or an alkyl acrylate.
Abstract: A dynamically vulcanized composition is provided which comprises a polyolefin resin, an elastomer, and an ethylene copolymer resin such as a copolymer of ethylene and vinyl acetate or an alkyl acrylate. A process for producing the dynamically vulcanized composition is also provided, which process includes the addition of the ethylene copolymer resin after the dynamic vulcanization step. The resulting composition comprises the ethylene copolymer resin predominantly in the polyolefin resin phase. The compositions have improved surface appearance and softness.
60 citations