Polyvinyl Alcohol 1,2-glycol group

The same considerations can be applied in regard to the initiator concentration. In the extreme case, the initiator can be adsorbed by the template coils or can be a part of the template. Bamford has suggested initiation of polymerization by the end-groups of the polyvinyl alcohol template. Also, polyethylene glycol with azo-groups has been used for initiation of template polymerization of methacrylic acid. Initiation was possible... 

Reynolds (19) has given a preliminary report of experiments which show that persulphate resembles periodate In oxidising the l 2-glycol groups of which there are about 2% In polyvinyl alcohol although the reaction Is not quantitative. Conjugated unsaturated ketone groups axa also formed these may retard polymerisation. 

Over many years, nonionic surfactants have become more and more important in the pharmaceutical held because of their ability to solubilize poorly soluble substances and their low toxicity (36). The principal group.s used in this domain are polyol derivatives, polyoxyethylene esters and ethers, and poloxamers. but other surfactants are also included in this classification, such as nonyiphenyl ethers, polyvinyl alcohol, propylene glycol diacetate, or alkanolamides. 

Finally, a decrease of the periodic acid concentration can be a measure of 2-glycol groups and of head to head bonds in polyvinyl alcohol. 

Other polymers which have been the subject of thermal degradation studies include ethylene-vinyl acetate [29, 66, 67], ethylene-vinyl alcohol [68], poly(aryl-ether ketone) [69], poly-2-vinyl-naphthalene-co-methyl maleate [34], polyphenylenes based on diethyl-benzophenone [70], polyglycollide [71-73], poly(a-methylstyrene tricarbonyl chromium [74], polytetrahydrofuran [75], polylactide [76-78], poly(vinyl) cyclohexane [79], styrene-vinyl cyclohexane [80], isopropenylacetate-maleic dianhydride [80], polyethylene glycol containing a 1,3-disubstituted phenolic group [81], poly-2-vinyl naphthalene-co-methacrylate [34], collagen biopolymers [82], chitin graft poly (2-methyl-oxazoline - polyvinyl chloride blends [83], cellulose [32, 83-88] and side-chain cholestric elastomers [89, 90]. 

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