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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.


Papers
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Journal ArticleDOI
R. J. Slocombe1
TL;DR: In this paper, the ratio of monomers charged is taken from a line joining the azeotropic copolymer compositions (designated the annealing line) as shown when the system is plotted on triangular coordinates.
Abstract: Terpolymer systems which form two azeotropic copolymers frequently give clear terpolymers when the ratio of monomers charged is taken from a line joining the azeotropic copolymer compositions (designated the azeotropic line) as shown when the system is plotted on triangular coordinates. Two terpolymer systems which form three azeotropic copolymers gave clear terpolymers from compositions lying within the area bounded by the three azeotropic lines and in one of the external triangular areas. In the 44 terpolymer systems reported, those containing styrene, various substituted styrenes, acrylic acid, acrylonitrile, methacrylonitrile, methacrylic acid and esters (methyl through butyl), maleic and fumaric esters (methyl and ethyl), vinyl methyl ketone, butadiene, isoprene, and vinyl acetate largely conformed to this behavior. Systems consisting of either two styrene monomers and one methacrylic ester or one styrene monomer and two methacrylic esters are unusual in that clear terpolymers were obtained from all compositions tested. Systems containing acrylic esters, vinylidene chloride, maleic anhydride, and trans-dichloroethylene did not conform to this behavior. A number of corresponding monomer and polymer compositions, obtained by solution of the terpolymer equations, were plotted on triangular coordinates. The graph showed that, during polymerization, the composition of the polymer species formed and the composition of the residual monomers migrate toward that of one of the pure monomers. Clarity of films cast from solutions containing two or more different polymers was used as an indication of compatibility. High compatibility was found with polymers having compositions on the azeotropic line. Incompatibility was found with polymers having compositions not on the azeotropic line. Incompatibility increased as the distance between these compositions (shown by a triangular graph) increased.

43 citations

Journal ArticleDOI
TL;DR: In this article, thin slabs of theophylline and monomer albumin were prepared by dispersing 212-300 μm and 300-25 μm particles respectively, of these bioactive agents in a methylene chloride solution of ethylene/vinyl acetate (EVAc) copolymer (40 wt% vinyl acetate), and evaporating the solvent at low temperatures according to the Langer-Folkman technique.

43 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented the production of PVA/PVAc spherical particles that can be used to occlude blood vessels, eliminating the disadvantages of commercial PVA.
Abstract: Poly(vinyl alcohol), PVA, is the most frequently used material in embolization of tumors, aneurisms and arteriovenous malformations due to its low toxicity, good biocompatibility and desirable physical properties. It is well known that PVA particles cannot be prepared by direct polymerization of vinyl alcohol. Its synthesis is typically performed by the suspension polymerization of vinyl acetate to produce poly(vinyl acetate), PVAc, followed by the saponification of the PVAc particles. This work shows that, using the suspension polymerization technique, it is possible to obtain spherical particles with a core-shell structure of PVA/PVAc with regular morphology, instead of particles with irregular shapes and sizes, as usually found in many commercial embolization products. Therefore, this work presents the production of PVA/PVAc spherical particles that can be used to occlude blood vessels, eliminating the disadvantages of commercial PVA. In vivo clinical tests with white “New Zealand” rabbits undergoing kidney inflammation reaction have shown that these spherical particles are much more efficient for vascular embolization.

43 citations

Journal ArticleDOI
TL;DR: In this paper, the initial reaction rate was found to exhibit reasonable correlation with the solvent properties such as hydrophobicity (log P ), water solubility (log S w ), electron pair acceptance (E T N ), polarisability and dielectric constant.

43 citations

Patent
06 Apr 1999
TL;DR: In this paper, the problem of obtaining a resin composition excellent in external appearances when molded and gas barrier properties by admixing plural saponified products of ethylene/vinyl acetate copolymers in a specific weight ratio with at least one thermoplastic resin in a particular weight ratio was solved.
Abstract: PROBLEM TO BE SOLVED: To obtain a resin composition excellent in external appearances when molded and gas barrier properties by admixing plural saponified products of ethylene/vinyl acetate copolymers in a specific weight ratio with at least one thermoplastic resin in a specific weight ratio. SOLUTION: The resin composition comprises plural saponified products of ethylene/vinyl acetate copolymers (A) and (B), in a component A/component B weight ratio of 90/10-10/90, and further at least one thermoplastic resin (C) selected among a low melting point nylon having a melting point of not higher than 160°C, a partially saponified product of an ethylene/vinyl acetate copolymer and a thermoplastic polyurethane in a components (A+B)/component C weight ratio of 95/5-50/50. The degrees of saponification (mole %) of the components A and B, Sv(A) and Sv(B), respectively, the ethylene contents (mole %) Et(A) and Et(B), and MFR(A) and MFR(B) (g/10 min) satisfy the relations; |SV(A)-Sv(B)|≥1, |Et(A)-Et(B)|≥5, and 4≤MFR(B)/MFR(A). COPYRIGHT: (C)2001,JPO

43 citations


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