聚丁烯-1（PB-1）因其优异的物理化学性能被誉为“塑料中的黄金”，其应用主要受限于加工生产中晶型II向晶型I转变引起的产品体积收缩等问题。半晶高分子聚集态结构特别是球晶的结构从某种程度上决定材料的物理性质。前期研究表明，通过控制等温结晶温度可以得到不同形貌的球晶（主要是方形和圆形），但是对于聚丁烯-1的不同形貌球晶还没有对其内部结构以及相变中的行为进行足够阐明。本项目拟在不同条件下培养不同形貌的球晶，利用先进同步辐射微束X射线广角和小角衍射技术，原位研究和解析球晶生长及从晶型II到晶型I相变过程中分子链及其片晶排列及演变机理，并且结合利用二维红外成像等技术原位探测球晶内部各向异性分布。最后，通过对不同形貌聚丁烯-1球晶进行机械性能分析，建立不同球晶形貌与力学性能的关系。以上研究不仅可以对高分子物理领域所关心的不同形貌球晶内部结构加深理解，也为实际生产中的问题提供理论指导。

Isotactic poly(butene-1) is famous of “gold of plastic” because of its pronounced physicochemical properties. But one problem is the volume shrinkage of the products due to the phase transition from form II to form I. The physical properties are determined by the aggregated structure of semicrystalline polymer especially structure of spherulite to some degree. It had been reported that various morphological spherulites (mainly square and round shapes) can be obtained by controlling the isothermal temperature. However, the inner structure in the spherulite of isotactic poly(butene-1) and the behavior during phase transition with different morphology have not been clarified well. In this project hence, various shapes of spherulite will be prepared in different conditions. By utilizing in-situ synchrotron microbeam WAXD/SAXS measurement, the mechanism of the polymer chains and stacked lamellae in the growth and phase transition process of spherulite will be studied in detail. And also, two-dimensional IR imaging technique can help us to detect the heterogeneous distribution within the spherulite. At last, various mechanical measurements will be performed in order to clarify the relation between morphology of spherulite and mechanical property. Such studies not only be helpful for understanding the inner structure of spherulite with various morphology in polymer physics, and also can provide the theoretical guidance for the industrial field.