关键词: 聚丙烯, 结晶, &alpha, /&beta, 复合成核剂

Abstract: Three kinds of well studied α/β compounded nucleating agents（NAs），phosphate/amide，sorbitol/amide，and phosphate/carboxylate were selected to investigate their influence on the crystallization kinetics，crystallization morphologies，and mechanical proprieties of isotactic polypropylene（iPP）. It can be summarized the key factor of affecting the α/β compounded NAs is the crystallization temperature（T_C）. The NA with higher T_C plays a leading role in the crystallization process. Competitive nucleation will occur when the difference of T_C between two NAs is not pronounced. According to this rule，the optimization method for compounding α and β NAs can be developed. An example of adjusting the stiffness and toughness of isotactic polypropylene based on different of α/β compound nucleating agents was employed.

Key words: isotactic polypropylene；crystallization；α/&beta, compounded nucleating agents