Polyvinylmethyl ether

Latex used in the manufacture of dipped goods using a heated former. The latex is heat-sensitised by addition of polyvinylmethyl ether (PVME) or certain polyglycols and the action of the hot former causes a layer of coagulated mbber to be deposited. 

The good solubility of the polyvinyl ethers in polar and nonpclar solvents was useful for the combination with nitrocellulose, whereby the water solubility of the polyvinylmethyl ether has no influence. Polyvinyl ethers have low compatibility with many polymers and therefore are mostly combined with other compatible plasticizers. As they are nontoxic they can be used in food packaging. 

The solubility of the polymer in various media is dependent on the nature of its vinyl groups. Polyvinylmethyl ether dissolves in aromatic hydrocarbons, esters, ketones, alcohols, and cold water. However, polyvinylbutylether is soluble in aliphatic hydrocarbons but not in water, methanol and ethanol. Polyvinyloctadecyl ether possesses a wax-like consistency. The polymers can be mixed with one another as well as with many natural resins and plastics. 

Lodge, Markland, and Wheeler [112] used QELSS to measure Dp of 3-armed and 12-axmed star polystyrenes in polyvinylmethylether orthofluorotoluene. The 3-armed stars had P of 379 and 1190 kDa the 12-armed stars had P of 55, 467, 1110, and 1690 kDa. Polyvinylmethyl ethers used as matrices had M of 140, 630, aud 1300 kDa. Polystyrenes all had Mp,/M < 1.1 the PVMEs had M /Mn 1.6. Light scattering measurements were made of Rg of linear, 3-axm and 12-arm stars with > IMDa in solutions of 250 kDa PVME for c < 50 g/L. Lodge, et al. [112] numerically modified their reported Dp, as described by Wheeler and Lodge [125] this modification factor has been removed here to recover the measured diffusion coefficients.. For every P M combination, a stretched exponential describes Ds c) well. 

Figure 29. Probe diffusion of (top to bottom) 50, 100, 420, and 900 kDa polystyrenes through 110 kDa polyvinylmethyl ether in toluene, based on data in Martin [113,104], Solid lines are joint fits of all data to a stretched exponential in c and P.

Polydimethylsiloxane Polycarbonate" Polyethylene terephthalate Polyacrylonitrile Poly (oxydiphenylene)-T oly (pyromellitimide) Polyvinylmethyl ether Polyvinylethyl ether Polyvinylpropyl ether Polyvinyl-n-butyl ether Polyvinyl-i-but ether Polyvinyl-t-butyl ether... 

T.R. Krishnan, and I. Abraham, Improved aqueous dissolution of clofazimine from coevaporates using polyvinylmethyl ether/maleic anhydride copolymer, Drug Dev. Ind. Pharm., 17 (13), 1823-1842,1991... 

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