Study of the physicochemical properties and film structure of ternary graft copolymers of aromatic polyimide, ɛ-caprolactam, and ω-dodecanelactam

The microstructure of films of ternary graft copolymers of aromatic polyimide, ɛ-caprolactam, and ω-dodecanelactam has been studied by atomic force microscopy. It is shown that an increase in the content of ω-dodecanelactam units in copolymers leads to an increase in the diameter of spherulites composed of fibrils. Simultaneously, water absorption decreases and the mechanical properties and crystallinity of copolymer films change.