STUDIES ON BLOCK COPOLYMERS DERIVED FROM AZOBISCYANOPENTANOIC ACID .2. SYNTHESIS OF BLOCK COPOLYMERS FROM REACTIVE POLYMERS HAVING TERMINAL ACYL CHLORIDE GROUPS

A reactive polystyrene (I) having terminal acyl chloride groups was prepared by radical polymerization of styrene using azobiscyanopentanoyl chloride as an initiator. The presence of terminal acyl chloride groups at the both chain ends of I was estimated by the polycondensation of with the equimolar amount of 1,6-hexamethylenediol (II): the polycondensation resulted in thIe formation of (I-II), type copolymer, where n=3~4. Polycondensation of an equimolar mixture of I and poly (ethylene glycol) (III) gave a (I-III) type block copolymer. The copolymer, with n=1.4~1.9, was characterized by IR spectroscopy, turbidimetric titration, osmometry, and GPC. I was also reacted with an excess amount of III (5 kinds with various molecular weights), and III-I-III type block copolymers were obtained. Similarly, a reactive poly (methyl methacrylate) (IV) having terminal acyl chloride groups was prepared and reacted with II to yield a II-IV block copolymer. © 1979, The Society of Polymer Science, Japan. All rights reserved.