Synthesis of Nylon 6-SBR-Nylon 6 Block Copolymers

[摘要] Isocyanate-terminated SBR-prepolymers were prepared from SBR-diol and excess toluene diisocyanate. These prepolymers were then used as initiators for the sodium-catalyzed polymerization of ¥å-caprolactam. The resulting block copolymers, presumably the structure of nylon 6-SBR-nylon 6, were confirmed from their IR spectra. The viscosities of these polymers were measured in phenol/tetrachloroethane and the molecular weights were estimated. The polymerization reaction was not affected by the change in concentration of catalyst, but significantly faster at 185¡É than at 150¡É. And the initiator concentration of 0.5 mole % gave good results.

[学科分类] 化学（综合）