Polymethyl vinyl ether

Nair and Chien [44] compared patches and tablets of different polymers (sodium carboxymethylcellulose, carbopol, polyethylene oxide, polymethyl vinyl ether-maleic anhydride, tragacanth) regarding their release characteristics of four drugs (chlorheximide, clotrimazole, benzocaine, and hydrocortisone). They observed sus-... 

This is also true of vinyl alkyl ethers. Thus the Tg of polyethyl vinyl ether is lower (244 K) than the Tg of polymethyl vinyl ether (263 K). However, branched alkyl groups increase the Tg, mainly through imparted steric restrictions. Hence the Tg values of polyvinyl -butyl ether, polyvinyl isobutyl ether, and polyvinyl /er/-butyl ether are 221, 255, and 361 K, respectively. 

PEO and polymethyl vinyl ether were UV irradiated in hydrogen peroxide solutions. Hydroxy and hydroperoxy radicals accelerate the oxidative degradation of these polymers. Hydroxy and possibly hydroperoxy radicals can abstract hydrogen from methylene groups in both polymers. As a result of further oxidative reactions, different carbonyl, hydroxy and hydroperoxy groups are formed (297). 

For example, it has been demonstrated that normal SEC behavior can be obtained for polymethyl vinyl ether-comaleic acid using a mobile phase consisting a of pH 9 buffer system [prepared from tris(hydro-xymethyl) aminomethane and nitric acid] modified with 0.2 M LiNOj (5). Halide salts should be completely avoided they tend to corrode the stainless steel inner surfaces of the SEC system, which in turn causes injector fouling and column contamination. 

Tacticity studies have been conducted on poly(3-methyl-l-butene) [120], poly(p-isopropyl-a-methyl styrene) [121], a-methyl styrene [122], polytetrafluoroethylene [123], polyacrylic acid [124], polymethylvinyl ethers [125], polyacrylonitrile [126, 127], polyvinyltrifluoro acetate [128], polyvinyl alcohol and its ethers [129, 130], isobutene-maleic anhydride [111], isobutene dimethyl fumerate [131], isobutene dimethyl maleate [131], polyacrylonitrile [127], ethylene - vinyl acetate [132-135], polyalkyl vinyl ethers [136, 137], ethyl-2-chloroacetate [133], poly-trans-1,3-pentadiene [138], isotactic-l-butene - propylene [139], butadiene - propylene [140], polybutene [141], polychloroprene [142], ethylene - vinyl chloride [143], chlorinated polyethylene [144, 145], poly-a-methyl styrene [146], styrene acrylic acid [147], a-methyl styrene - methacylonitrile [148], styrene acrylonitrile [149], styrene isobutene [150], poly(p-fluoro-a-methyl styrene) [151], polyarylamide-6 [152], PP - polyamide-6 [152], polystyrene oxide [153], polybutene [154], atraconic anhydride - p-chlorostyrene [155], styrene - maleic anhydride [156, 157], ethylene - vinyl acetate [158], polymethyl vinyl ether [159], propene - carbon monoxide [160], methyl(3,3,3-trifluoropropyl)siloxane [161], poly(diallyldimethyl ammonium chloride) [162], polypropene [163, 164], polyepichlorohydrin [165], maleic anhydride-p-chlorostyrene [166], polymethacrylonitrile [167] and polyvinyl acetate [168]. 

Structural studies of polymer surfaces materials that have been studied include polymethyl methacrylate (PMMA) [22], PMMA-polypyrrole composites [23], poly(chloromethyl styrene) bound 1,4,8,11 tetrazacrylotetra decane poly(chloromethyl styrene) bound theonyl trifluoroacetone [24], polydimethyl siloxane-polyamide copolymers [25], PS [26], ion-implanted PE [27], monoazido-terminated polyethylene oxide [28], polyurethanes [29], polyaniline [30], fluorinated polymer films [31], poly(o-toluidine) [32], polyetherimide and polybenzimidazole [33], polyfullerene palladium [34], imidazole-containing imidazolylethyl maleamic acid - octadecyl vinyl ether copolymer [35], polyphenylene vinylene ether [36], thiphene oligomers [37], fluorinated styrene-isoprene derivative of a methyl methacrylate-hydroxyethyl methacrylate copolymer [38], polythiophene [39], dibromoalkane-hexafluorisopropylidene diphenol and bisphenol A [40], and geopolymers [41],... 

ManufJDiM). ABCR Alfa Aesar Chemos GmbH Gelest United Chem. Tech. Trade Nemes FMS-121 FMS-123 FMS-131 FMS-141 Polymethyl-3,3,3-tiifluoropropylsiloxanefdiinethylsiloxane copolymer. See 3,3>Trilluoropropylmethylsiloxane/dimethylsiloxane copolymer Poly (methyl vinyl ether-aK-maleic acid). See Methyl vinyl etherfmaleic acid copolymer... 

Parallel approaches have been described for the preparation of polyacrylate-protease conjugates [396-400]. Acryloylation of subtilisin and a-chymotrypsin, followed by mixed polymerization with methyl methacrylate, vinyl acetate, styrene, or ethylvinyl ether, provides insoluble, doped polymethyl methacrylate, polyvinyl acetate, polystyrene, and polyethyl vinyl ether polymers [396]. These biocatalytic plastics perform especially well in hydrophilic and hydrophobic solvents, and have been used for peptide synthesis and the regioselective acylation of sugars and nucleosides. Similarly, modification of subtilisin and thermolysin with PEG monomethacrylate, then copolymerization with methyl methacrylate and trimethylolpropane trimethacrylate furnishes protease-polymethyl methacrylate plastics, which show good activities and stabilities in aqueous, mixed, and low-water and anhydrous organic media [397-400]. The protein-acrylate composites are unique in that they enable catalytic densities as high as 50% w/w. 

Vinyl resins (1934) n. According to common chemical nomenclature, all resins and polymers made from monomers containing the vinyl group, H2C=CHX. In the chemical literature, polystyrene, polyolefins, polymethyl methacrylate and many other styrenic, ethenic, and acrylic co-polymers are classified as vinyls. In the plastics literature, the above materials are given their own classifications and the term vinyl is restricted to compounds in which X, above, is not H, a hydrocarbon radical, nor an acrylic-type ester. In daily use, the term vinyl plastics refers primarily to polyvinyl chloride and its co-polymers, and secondarily to the following polyvinyl acetal, polyvinyl acetate, poly-vinyl alcohol, polyvinyl but-yral, poly(n-vinylcar-bazole), polyvinyl dichloride, polyvinyl formal, polyvinylidene chloride, polyisobutylvinyl ether, and poly (1-vinylpyrrolidone). Mishra MKM, Yagd Y (1998) Handbook of vinyl polymerization. Marcel Dekker, New York. 

ABS Acrylontrile-butadiene-styrene EVA Ethylene-vinyl acetate PAI Polyamide-imide PC Polycarbonate PE Polyethylene PEEK Polyether ether ketone PES Polyether sulfone PET Polyethylene terephthalate PI Polyimide PMMA Polymethyl methacrylate PPO Polyphenylene oxide PPS Polyphenyl sulfide XLPE Crosslinked polyethylene Source Author s own files ... 

Ethylene Glycol Monoethyl Ether Acetate n (Cellosolve acetate) C2H5OC2H4OOCCH3. A solvent for cellulose nitrate, ethyl cellulose, vinyl polymers and copolymers, polymethyl methacrylate, polystyrene, epoxy, coumarone-indene, and alkyd resins. 

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