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Polyvinyl Acetate |
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polyvinyl acetate [¦päl·i′vīn·əl ′as·ə‚tāt]
(organic chemistry) (H2CCHOOCCH3)xA thermoplastic polymer; insoluble in water, gasoline, oils, and fats, soluble in ketones, alcohols, benzene, esters, and chlorinated hydrocarbons; used in adhesives, films, lacquers, inks, latex paints, and paper sizes. Abbreviated PVA; PVAc. polyvinyl acetate, PVA A colorless, thermoplastic, water-insoluble resin; used as a latex binder in certain paints. Polyvinyl Acetate a polymer of vinyl acetate, [—CH2—CH(OCOCH3)—]n. Polyvinyl acetate is a hard, colorless, and nontoxic substance with a molecular weight of 10,000–1,500,000, depending on preparation conditions. It is soluble in many organic solvents but not in gasoline, mineral oils, or water. Polyvinyl acetate softens at low temperatures (26°-28° C) and exhibits cold flow and high adhesion to various materials. Polyvinyl acetate is produced by the free-radical polymerization of a monomer in a solution, emulsion, or suspension. It is produced in the form of granules (beads), aqueous dispersions, or varnish solutions. Polyvinyl acetate is an intermediate product in the synthesis of polyvinyl alcohol and polyvinyl acetals. It is used in the manufacture of interior and exterior emulsion paint finishes and adhesives for wood, paper, leather, and fabrics. It is added to concrete to improve its quality and is used in the production of seamless floors and chewing gum. In the USSR, polyvinyl acetate products are known by various trade names. Alcohol solutions include brands S-4, 8,12,18, and 26 (the numbers indicate the mean viscosity in centipoises). Beads include nos. 15, 25, 50, 75, and 100, and aqueous dispersions are known as NV, SV, and VV. Outside the USSR, aqueous dispersions are primarily produced; trade names include Gelva and Vinylite (USA), Evaflex (Japan), Rhodopas (France), and Alkathene (Great Britain). World production of polyvinyl acetate in 1973 was about 1 million tons. REFERENCESSee references under .E. N. ROSTOVSKII Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Their construction usually involved glitter and too much PVA glue and they may or may not have been fully dry when we slid them, greasily in to their wonky folded envelopes. Any PVA glue, which has spilled or oozed onto the boards can easily be wiped off a lacquered or oiled board, or sanded off an unfinished floor. Anne Willis, Royal Society of Chemistry teacher fellow in clinical and forensic sciences, taught the children how to create their own bright goo by mixing PVA glue and borax solution. |
PVA glue |
PV WAVE PV&D PV+ PV- PV-AddIn-Manager PV-F PV-FET PV-PIN PV-RR PV-SB PV-WAVE PV/BSA PV/BV PV/SMV PV:IF Pv=nrt Pv=nrt Pv=nrt PV1 PV1&2 PV2 PV3 PV4E PV8 PVA PVA PVA PVA PVA and its Denatured Capsid Protein PVA glue PVA-CPPVAA PVAAC PVAAS PVAB PVAC PVAC PVACD PVAD PVADH PVAE PVAF PVAG PVAH PVAHA PVAI PVAIM PVAL Pvalue PVAM PVAMA1 PVAMC Pvamu PVANN PVAO | |||||||
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