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 article, the adsorption of 12 different nonionic water-soluble polymers, methylcellulose (MC), polygalactomannan (PGM), polyglycidol (PGD), polyacrylamide (PAAm), methylolated polyacrithmide (MPAAm) and polymethacrylonitriou amino acid (PVA 420), were investigated under aqueous conditions with attention to functional groups in the polymers and the chemical character of the pulps.
Abstract: The adsorption of 12 different nonionic water-soluble polymers, methylcellulose (MC), hydroxypropylcellulose (HPC), polygalactomannan (PGM), polyglycidol (PGD), polyacrylamide (PAAm), methylolated polyacrylamide (MPAAm), polymethacrylamide (PMAAm), three differently hydrolyzed poly(vinyl acetate)s (PVAs), poly(vinyl) methyl ether (PVME), and poly(vinyl pyrrolidone) (PVP) onto bleached kraft pulp (BK), unbleached kraft pulp (UK), and a groundwood pulp (MP) has been investigated under aqueous conditions with attention to the functional groups in the polymers and the chemical character of the pulps. It was found that the adsorption was often selective toward one of the pulps. In order to gain some additional information on these interactions, some adsorption experiments were also performed on acetylated pulps. Some polymers (PGD, PAAm, MPAAm, and PVA 124) having both proton donating and accepting capability were not adsorbed onto any of the pulps. This was attributed to intramolecular hydrogen bonding in these polymers. Some polymers (PVA 224, PVME, and PVP) were strongly adsorbed onto UK but not at all onto BK. It was suggested that in these cases the adsorptive interaction was between phenolic and/or catecholic groups in the lignin on the UK and proton accepting sites on the polymers. However, for three polymers (MC, PGM, and PMAAm), a more general type of hydrogen bonding interaction was considered. For some polymers (HPC, PMAAm, and PVA 420) having hydrophobic groups, it was suggested that hydrophobic interactions were important for the adsorption.
43 citations
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TL;DR: In this paper, the production of activated carbon fibres from commercial acrylic textile fibres was analyzed in order to study the chemical transformations suffered by the precursor during the process, which resulted in the formation of several functional groups.
43 citations
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TL;DR: In this paper, a brittle biodegradable thermoplastic polymer, was blended with rubbery poly(cis-1,4-isoprene) (PIP), which was incompatible as indicated by two T g ’s, each stemming from PLLA and PIP domains, respectively.
43 citations
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TL;DR: The mechanism of growth of latex particles in the emulsion polymerization of vinyl acetate using a polymerizable surfactant, sodium dodecyl allyl sulfosuccinate (TREM LF-40; Henkel), was investigated in this article.
Abstract: The mechanism of growth of latex particles in the emulsion polymerization of vinyl acetate using a polymerizable surfactant, sodium dodecyl allyl sulfosuccinate (TREM LF-40; Henkel) was investigated. Both the aqueous phase and the particle/water interface were found to be loci for the copolymerization of TREM LF-40 with vinyl acetate. The results suggest that the reactions at the particle/water interface are more important and that the particlesize of the latices is a key parameter controlling the polymerization rate through copolymerization and chain transfer to the polymerizable surfactant at the particle surface
43 citations
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23 Mar 1956
TL;DR: In this paper, a copolymer of vinyl chloride, vinyl acetate and vinyl alcohol and an alcoholic type urea-formaldehyde resin is used to render synthetic resinous surfaces less permeable to organic liquids.
Abstract: A composition for application to synthetic resinous surfaces to render them less permeable to organic liquids comprises a mixture of a co-polymer of vinyl chloride, vinyl acetate and vinyl alcohol and an etherified urea-formaldehyde resin. From 20 to 90% of the former and 80 to 10% of the latter may be used. The components are mixed in an organic solvent, e.g. a toluenemethyl ethyl ketone-xylol-butanol mixture, applied to the surface and cured by heat or irradiation, or both. When curing is by irradiation, graft polymerisation between the coating and the substrate may take place. U.S.A. Reissue Specification 24,062 and U.S.A. Specifications 2,059,706, 2,069,844, 2,547,684, 2,632,921, 2,704,362, 2,715,075, 2,715,076 and 2,715,077 are referred to.ALSO:A sealable synthetic resinous article having a surface characterized by enhanced resistance to permeation by organic fluids has on its surface a cured coating of a composition consisting essentially of a copolymer of vinyl chloride, vinyl acetate and vinyl alcohol and an alcoholic type urea-formaldehyde resin. The composition may contain 20 to 90% of the copolymer and 80 to 10% of the ureaformaldehyde, and is applied in solution in an organic solvent by dipping or spraying or in the case of containers by filling and draining. The coating may be cured by heating at 160 DEG -200 DEG F. for 30-120 minutes, or by irradiation, or by both heat and irradiation. Catalysts such as sulphuric acid may be added. Examples are given of lining polyethylene and polymethylene bottles, and coating polystyrene sheets to be made into envelopes and sachets. The process is also applicable to other synthetic resins, rubber and its derivatives, and cellulose esters and ethers. The surfaces may be pre-treated with sodium dichromate and sulphuric acid, or by flaming. U.S.A. Re-issue Specification 24,062 and U.S.A. Specifications 2,059,706, 2,069,844, 2,547,684, 2,632,921, 2,704,362, 2,715,075, 2,715,076, and 2,715,077 are referred to.
43 citations