5J Kim, M E Nichols, E J Robertson. The annealing and thermal analysis of poly ( butylene terephthalate ) [ J ]. J. Polym. Sci. : Part B : Polym. Phys. , 1994,32 : 887-899.
6S Z D Cheng,R Pan,B. Thermal analysis of poly( butylene tereph- thalate) for heat capacity, rigid-amorphous content, and transition behavior[ J]. Wunderlich. Makromol. Chem., 1988, 189:2443- 2458.
7K H Illers. The two-phase structure of segmented block copoly( e- ther ester) [ J]. Colloid Polym Sci, 1980,258:117.