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Chemical modification of poly(vinyl chloride) using sodium trisulfide

Research paper by Tomohito Kameda, Makoto Yoshihara, Guido Grause, Toshiaki Yoshioka

Indexed on: 26 Apr '15Published on: 26 Apr '15Published in: Journal of Polymer Research



Abstract

Chemically modifying after-life PVC may be a useful way of reducing plastic waste. In this work, we modified PVC using a solution of Na2S3 in ethylene glycol, diethylene glycol, and triethylene glycol at temperatures of 150–190 °C. Substitution ratios as high as 89 % were observed, especially at high temperatures. Against our expectations, only monosulfide bridges were present in the modified PVC; polysulfides were absent. This can be explained by the fission of S32− into highly reactive anion radicals. Using a lower-polarity solvent (triethylene glycol) accelerated the dechlorination but also enhanced elimination.