핵자기공명 분광법을 이용한 PC/PBT 블렌드의 에스테르 교환에 관한 반응속도 연구

초록

The kinetic properties of transesterification reaction in polycarbonate/poly(butylene terephthalate) (PC/PBT) blends were investigated by H-1 NMR spectroscopy under various annealing conditions. During the TGA analysis which is commonly used for composition analysis of polymer blends, the exchange reaction occurred very actively before it reached the thermal decomposition temperature of PBT. Hence, the composition of PC in thermogram seemed to be less than the original value. The kinetic constants of transesterification in PC/PBT (50:50 wt%) blend and powder mixture at 200, 250, and 300 degrees C were calculated from the degrees of transesterification obtained while increasing the annealing time. It was found that the kinetic constants for the blend were greater than the mixture, and the exchange reaction was considerably progressed even in the short annealing time.

키워드