Polymères thiocarboxyliques, 2. Synthèse par modification de polymères préformés

Dithioester groups were introduced into linear or crosslinked polystyrenes by Friedel‐Crafts reaction with ClCH2Si(CH3)3/CS2 or with ethyl chlorodithioformate, as well as thioamide groups by reaction with ethoxycarbonyl isothiocyanate. Treatment of several copolymers of acrylonitrile with ethanethiol and hydrogen chloride and subsequently with H2S led to copolymers with dithioester and thioamide groups in the side chains without cyclization. Most of these reactions occur without crosslinking.