Vinyl polymers polyvinylacetate

Vinyl Polymers. See in Vol 8, P353-R to P358-R under Polyvinylacetate, Polyvinylalcohol, Polyvinyl Chloride or Polyvinyl Nitrate (PVN) and in this article under appropriate entries... 

A munber of other synthetic polymer networks have been developed and commercialised for liquid chromatography including polyvinylacetate cross-linked with butanediol divinyl ether, Merkogel GPC packings (Merck), polyvinylalcohol, Frac-togel and Toyopearl (Toyo Soda), a hydroxylated acrylic monomer cross-linked with a bifunctional agent, Trisacryl (Sepracor) and a hydrophilic vinyl polymer, TSKgel PW (Toyo Soda). 

Polymer emulsions, such as styrene-butadiene-rubber (SBR latex), acrylics, polyvinylalcohol, polyvinylacetate and vinyl-acrylics are used in the manufacture of a wide variety of products. Approximately 70% of the polymer emulsions are applied in four major end uses ... 

In addition to backbone modifications, the side chains of addition polymers can also be modified to generate polymer structures that would not be possible by polymerization techniques. The classic example is the preparation of polyvinyl alcohol by the deprotection of polyvinylacetate (Figure 20). In this transformation, the product polymer is the structure that would result from the polymerization of vinyl alcohol. However, vinyl alcohol is an unstable monomer that predominantly exists in its tautomeric form of acetaldehyde. Thus the polymerization of vinyl alcohol is not practical. Vinyl acetate, on the other hand, is readily polymerized and thus serves as an attractive precursor to polyvinyl alcohol. 

MAJOR POLYMER APPLICATIONS ABS, acrylics, cellulose acetate, epoxy resin, ethylene propylene diene copolymer, ethylene vinyl acetate copolymer, polyamide, polycarbonate, polyester, polymethylmethacrylate, polypropylene, polystyrene, polysulfone, polyurethane, polyvinylacetate, polyvinylchloride, proteins, rubber, SB starch ... 

Strength properties with impervious substrates as well as with wood. They are combined with thermoplastic polymers to provide both metal-to-metal or metal-to-paper or plastic bonding. It is postulated that the phenolic crosslinks to rubber through quinone methide intermediates by a 1-4 addition across the vinyl double bonds. Some of the main materials are NBR with 15-40% acrylonitrile in nitrile/phenolic resins and polyvinylacetal in vinyl/phenolic blends. In all cases the phenolic gives inherent strength, solvent resistance, and thermal stability to the adhesive. 

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