The structure and physical properties of anionically polymerized nylon 6 crosslinked by bislactams

Crosslinked polyamides prepared by copolymerization of ϵ‐caprolactam with bislactams under conditions of activated anionic polymerization proceeding adiabatically below their melting point show differences in physico‐mechanical properties. Owing to varying copolymerization rates of bislactams, depending on the position of the connecting bridge of the bislactam in relation to the amido group, copolymers with different morphological structure are formed. The differences in the mechanical properties of the copolymers are explained on the basis of the differences in the morphological structure. This explanation is supported by results obtained by measuring the thermal and dynamic properties.