基于结晶理论在高分子科学中的重要地位及成核剂在工业应用上的重要性，深入理解成核剂发挥功效的物理机制具有十分重要的学术及应用价值。成核剂在高分子熔体中诱导成核时的超分子组装体结构与其成核效果密切相关。对于大多数成核剂在高分子熔体中的聚集结构与其加入基体前的“初始”结构不同，因此，仅从其化学结构、晶胞参数等层面理解其成核作用并不全面。本项目以一类芳香二酰胺β成核剂为对象，澄清此类成核剂能否溶解于等规聚丙烯(iPP)熔体这一基本问题，并系统研究升温过程成核剂在熔体中的分散行为和降温过程的自组装行为及各自的物理机制，在此基础上研究其在熔体中形成超分子组装体的结构及对iPP结晶行为的影响，弄清组装结构与成核作用之间的可能关系。通过本项目工作，有望全面理解此类成核剂在iPP熔体中结构演化的规律，加深对成核剂不同层次结构与效能之间关系的认识，获得此类成核剂作用机理的新知识，丰富高分子结晶理论的内容。

For semi-crystalline polymers such as polpypropylene (iPP), crystallization has been proved to be a key factor for final physical properties and mechanical performances. The addition of nucleating agents is a highly effective method to increase the number of crystal nucleus in unit volume of polymer melt and therefore draws great interest from both academia and industry. As for most nucleating agents, the real structure of nucleating agent to induce the nucleation in polymer melt is far away from that of their original state before adding into matrix. Despite decades of research, some fundamental problems in nucleation mechanism of nucleating agent still remain mysterious. In order to determine the relatively precise structure of nucleating agent in polymer melt toward a further understanding on their nucleating mechanism, in this work, the structural evolution process of a series of aromatic bisamide nucleating agents will be systematically investigated. After clarifying the fact that whether these agents may be molecularly dissolved in iPP melt, the “dissolution” or dispersion process of the agents during heating and the supramolecular self-assembly behavior during cooling will be explored. By comparatively studying the self-assembly structure of the agent in melt as well as corresponding nucleation effectiveness, it is possible to achieve more deeply understanding on the relationship between nucleation effectiveness of the nucleating agents and their multi-scale self-assembly structures.