Bischloroformates of hydroxy‐terminated poly(tetramethylene glycol) (PTG) and polystyrene (PSt) were prepared and used as the initiators for the anionic polymerization of α‐pyrrolidone and ε‐caprolactam in bulk at 30°C and 80°C, respectively. Initiation efficiency was sufficiently high to give well‐defined nylon–PTG(or PSt)–nylon block copolymers. Both the yield and the viscosity of the block copolymer increased with polymerization time up to 50% conversion of the lactam.
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Yamashita et al. (1972) studied this question.
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