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: Lipase PS-catalyzed kinetic resolution of vicinal azidoalcohols was accomplished and the enzymatic reaction rates and the enantioselectivities were significantly enhanced under the ultrasonic irradiation.
Abstract: Lipase PS-catalyzed kinetic resolution of vicinal azidoalcohols was accomplished. The enzymatic reaction rates and the enantioselectivities were significantly enhanced under the ultrasonic irradiation.
41 citations
TL;DR: In this paper, the intrinsic kinetic properties of MsAcT for the hydrolysis and transesterification of esters in water as well as the thermodynamics of the reaction were investigated.
Abstract: MsAcT catalyzes the esterification of primary alcohols in water. When utilizing acid and alcohol as starting materials low yields dictated by thermodynamics were observed. However, with activated esters such as ethyl acetate and vinyl acetate very high yields of the desired ester can be achieved in combination with the appropriate alcohol. This study investigated both the intrinsic kinetic properties of MsAcT for the hydrolysis and transesterification of esters in water as well as the thermodynamics of the reaction. In comparison to the chemical or enzymatic ester synthesis using either toxic reagent, and harsh organic solvents, the MsAcT-catalyzed synthesis of esters of primary alcohols can be achieved efficiently in water without neutralization steps.
41 citations
TL;DR: In this paper, a laboratory evaluation of conventional, fundamental, rheological, and morphological characteristics of styrene-butadiene-styrene (SBS) andethylene vinyl acetate (EVA) polymer modified bitumens is presented.
Abstract: Received 6 March 2010; accepted 28 January 2011DOI 10.1002/app.34282Published online 7 July 2011 in Wiley Online Library (wileyonlinelibrary.com).ABSTRACT: This article presents a laboratory evaluationof conventional, fundamental, rheological, and morpholog-ical characteristics of styrene-butadiene-styrene (SBS) andethylene vinyl acetate (EVA) polymer modified bitumens.Polymer modified bitumen (PMB) samples have been pro-duced by mixing a 50/70 penetration grade unmodified(base) bitumen with SBS and EVA copolymer at differentpolymer contents. The fundamental viscoelastic propertiesof the PMBs were determined using dynamic (oscillatory)mechanical analysis and presented in the form of tempera-ture and frequency-dependent rheological parameters.The morphology of the samples as well as the percentarea distribution of polymers throughout the base bitumenhave been characterized and determined by means offluorescent light optic microscopy and Qwin Plus imageanalysis software, respectively. The results indicated thatpolymer modification improved the conventional andrheological properties of the base bitumen. It was alsoconcluded that the temperature and frequency had a sig-nificant effect on complex modulus of PMBs. The behaviorof EVA and SBS PMBs had exhibited quite difference at50 C. Moreover, it was found out that at low polymercontents, the samples revealed the existence of dispersedpolymer particles in a continuous bitumen phase, whereasat high polymer contents a continuous polymer phase hasbeen observed.
41 citations
TL;DR: The compositions and sequence distributions of vinyl acetate-butyl acrylate copolymers obtained with batch and semicontinuous emulsion polymerizations have been studied by 1H and 13C NMR as mentioned in this paper.
Abstract: The compositions and sequence distributions of vinyl acetate–butyl acrylate copolymers obtained with batch and semicontinuous emulsion polymerizations have been studied by 1H and 13C NMR. The batch process gives heterogeneous copolymers while with the semicontinuous one the sequence distribution is statistical. These differences in sequence distributions have been related to the physical properties of the copolymers.
41 citations
TL;DR: In this paper, the air surfaces of semi-crystalline EVA and EAA co-polymers with high wt% ethylene (9 − 27.5 wt%) were studied using XPS at three take-off angles, representing three depths of penetration from 15 − 58 A.
41 citations