Abstract: Ultrasonic degradation of chlorinated polypropylene in toluene solution obeyed the kinetic equation：1/(Mt－Mlim)－1/(M0－Mlim)=kt. It was discovered that viscosities of chlorinated polypropylene in dilute solution（1%—5%） decreased with time and finally reached a stable value. Nevertheless，in strong solution（10%—20%），viscosities decreased with time at the initial period and then approached its lowest value. After this lowest value，viscosities increased gradually. The reason why viscosity increased may be that strong solutions became irreversible rheopectic fluids under ultrasonic irradiation. Through determination of infrared spectrum and chlorine content，it was also discovered that the structure and chlorine content of chlorinated polypropylene had no change after ultrasonic irradiation. This indicated that the rupture position of chlorinated polypropylene molecular chain Loated C—C bond.

摘要： 超声波作用下，氯化聚丙烯相对分子质量随超声时间的变化规律符合二级动力学方程 1/(Mt－Mlim)－1/(M0－Mlim)=kt。低浓度氯化聚丙烯甲苯溶液（1%～5%）的黏度随超声时间的延长而降低，最终达到稳定值。高浓度氯化聚丙烯甲苯溶液（10%～20%）的黏度随超声时间的延长，开始逐渐下降，经过最低值后逐渐升高，氯化聚丙烯甲苯溶液在超声波作用下可能形成了不可逆的震凝性流体。红外分析和氯含量测定结果表明氯化聚丙烯分子链断裂位置在C—C键。