Polyurethane (PU) was synthesized from 4,4'-diphenylmethane diisocyanate, 1,4-butanediol, and poly(ethylene adipate) or poly(butylene adipate) diol (M_n= 2000) as a soft segment by prepolymer method in N,N-dimethylformamide. Hard segment content of PU was varied from 24 to 100 wt%. The synthesized PU was blended with bisphenol-A polycarbon-ate (PC) from a solution by casting method. PU/PC blends exhibited either two or single phase behavior depending on temperature and duration time of annealing by a differential scanning calorimeter. Such a behavior was attributed to the transreaction between PU and PC, and was studied further by thermal analysis methods.

4,4'-Diphenylmethane diisocyanate, 1,4-butanediol, 및 poly(ethylene adipate) biol 또는 poly(butylene adipate) diol (M_n=2000)을 사용하고, N,N-dimethylformamide를 용매로 하여 2단계 중합법에 의해 hard segment 함량이 24∼100wt%인 폴리우레탄(PU)을 합성하였다. 합성된 PU를 용액 블렌드법으로 bisphenol-A polycarbonate(PC)와 블렌드하여 그 상용 거동을 고찰하였다. PU/PC 블렌드물은 시차열량분석 시의 용융 온도 잊 가열 시간에 따라 단일상 또는 두 개의 상을 가지는 거동을 나타내었다. 이와 같은 거동의 이유는 PU와 PC간에 교환 반응이 일어나기 때문으로 판단되었고, 그 거동을 열분석 방법에 의해 관찰하였다.

Keywords: polyurethane; polycarbonate; miscibility; transreaction