采用ＴＧＡ 研究了稀土化合物对聚丙稀的热稳定作用． 通过电镜观察了经铬酸蚀刻的ＰＰ球晶在不同稀土化合物含量下的变化． 用Ｘ 射线衍射法比较了加入稀土化合物前后ＰＰβ结晶峰及结晶度的变化． 结果表明， 在ｗ （ＰＰ） ／ ｗ （ＲＥＣ） ＝ １００／１－０ ～１００／２－０ 范围内， ＰＰ热稳定性较好． ＲＥＣ对ＰＰ还有一定程度的成核作用 TGA was used to study the thermal stability of rare earth compounds on polypropylene. The changes of chromic acid-etched PP spherulites under different RE contents were observed by SEM. The crystallization peak and crystallinity of PPβ were compared by X-ray diffraction before and after addition of rare earth compounds. The results showed that the thermal stability of PP was better in the range of w (PP) / w (REC) = 100 / 1-0 ~ 100 / 2-0. REC has a certain degree of nucleation on PP