Polyurethane(PU) elastomer was synthesized from poly(tetramethylene glycol) (PTMG), 4.4''-diphenylmethane diisocyanate, and 1,4-butane diol by solution polymerization, and the physical properties of PU elastomers with various molecular weights and compositions of the soft segments (PTMG''s) were studied. As the molecular weight of soft segment was increased, phase segment into two domains of haed segment and soft segment was more evident based on the measurement of thermal and tensile properties, and spectroscopy. The crystallinity of each segment was decreased as the content of the other segment was increased, but the crystallization rate was increased.

Poly(tetramethylene glycol) (PTMG). 4.4''-diphenylmethane diisocyanate, 그리고 1,4-butanediol을 사용하여 폴리우레탄 탄성체를 용액중합하여. 탄성체 내의 soft segment의 함량과 분자량의 변화에 따른 물성의 변화를 조사하였다. Soft segment인 PTMG의 분자량이 클수록 hard segment와 soft segment의 상분리 정도가 큼을 열적성질. 적외선 분광분석, 강신도 거퐁에서 관찰할 수 있었다. 각 segment의 결정화도는 상대편 segment의 함량이 증가함에 따라 감소하나. 결정화 속도는 증가하였다.

Keywords: