本文研究了交联不饱和聚酯在低于T_g温度下退火处理,过剩热焓松弛过程及其物理和力学性能的变化。结果表明,随退火时间的增加,从T_g转变区吸热峰所确定的过剩热焓松弛量、T_g温度、实数杨氏模量和密度都提高,而虚数模量、内耗下降。从退火温度与过剩热焓松弛的速率确定了过剩热焓松弛过程的活化能为7千卡/充分子。讨论了这一松弛过程的分子机理。 In this paper, the crosslinking process of unsaturated polyester under T_g temperature annealing, excess enthalpy relaxation process and its physical and mechanical properties changes. The results show that as the annealing time increases, the excess enthalpy relaxation, T_g temperature, real Young’s modulus and density determined by the endothermic peak in the T_g transition region increase, while the imaginary modulus and internal friction decrease. From the annealing temperature and the rate of excess enthalpy relaxation, the activation energy of the process of excess enthalpy relaxation is determined to be 7 kcal / charge. The molecular mechanism of this relaxation process is discussed.