Preparation of PS‐<i>g</i>‐PA6 copolymers by anionic polymerization of ε‐caprolactam using PS precursors with <i>N</i>‐carbamated caprolactam pendants as macroactivators
摘要整理
Abstract The graft copolymer of polystyrene and polyamide 6 (PS‐ g ‐PA6) was investigated by anionic polymerization of ε‐caprolactam (CL), using the free radical copolymer of styrene and a kind of allyl monomer containing N ‐carbamated caprolactam group as macroactivator (PS‐CCL). CL monomers were grafted onto PS‐CCL backbone via initiating N ‐carbamated caprolactam (CCL) pendants along its backbone to form the graft copolymer in the presence of catalyst sodium caprolactamate. The macroactivator was characterized by Fourier‐transform infrared spectroscopy and nuclear magnetic resonance, and the graft copolymer by the selective solvent extraction technique using methanol and chloroform as solvents. PS‐ g ‐PA6 copolymers with different PS content were synthesized to study the effect of PS on morphology, crystallinity, dimensional stability, and thermal properties, using scanning electron microscopy, X‐ray diffraction, water absorption measurement, thermogravimetric analysis, and differential scanning calorimetry. The results show the percentage crystallinity of graft copolymer decreases with increasing PS content, but the addition of PS scarcely influences the crystalline structure of PA6. The graft copolymer has improved thermal properties and dimensional stability. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008