BLOCK-COPOLYMERS OF 6-HEXANELACTAM AND 12-DODECANELACTAM

Poly(6-hexanelactam)-block-poly(12-dodecanelactam) (polyamide-6-block- polyamide-12) diblock copolymers containing a small portion of the cor responding homopolymers were prepared by the anionic polymerization of 6-hexanelactam using poly(12-dodecanelactam)s with diacylamine branch ing sites as precursors of polymeric initiators (PPI). The PPI were pr epared by the acidolytic copolymerization of 12-dodecanelactam with N- benzoyl-12-dodecanelactam. The effect of PPI molecular structure on th e composition and properties of the block copolymers was followed. (C) 1996 Elsevier Science Ltd.