Synthesis of Water-soluble Polymers Bearing Thermodegradable Aprotic Onium Salt Groups
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概要
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Since water-soluble polymers have hydrophilic groups such as carboxyl group and their films exhibit inferior water resistance, thier application to coatings is limited to a small sphere. Among many kinds of onium salts, some aprotic salts are known to be easily decomposed by heating. We have found out that the onium salts synthesized from epoxy compounds with thioethers or tertially amines and carboxylic acids show lower decomposition temperature than 140°C, The effects of the epoxy groups, acids and bases on the conversion to aprotic onium salts and on their thermal decomposition were investigated in detail. The aprotic onium salts synthesized from glycidyl epoxy compound with thioethers and acetic acid were easily dissolved in water and decomposed thermally. It was assumed that their thermal decomposition occurred according to the mechanism of the Hoffmann degradation.
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