Anionic Copolymerization of ε-Caprolactam with ω-Laurolactam

Polyamide 6/12 copolymers were prepared by employing two different initiation systems containing activator N‐benzoyl‐ε‐caprolactam (BzCL) and initiator either sodium salt of ε‐caprolactam (CLNa) or ε‐caprolactam magnesium bromide (CLMgBr). Materials prepared by initiation with CLNa show one melting endotherm and are random copolymers. Materials prepared by initiation with CLMgBr show two melting endotherms and are probably composed from random copolymer and block copolymer containing blocks of random copolymer and blocks of copolymer with ε‐caprolactam rich segments. The character of copolymers and fractionalized materials was evaluated by means of DSC and NMR.