A customized micro-injection molding apparatus with a pair of diamond windows in the filling cavity was specifically designed to simulate the extreme processing conditions inherent in the practical micro-molding process. This setup combined with synchrotron radiation allows real-time investigation of multi-scale structural development during the manufacturing process, which enables evaluation of flow-induced crystallization features for a range of polymeric materials. In this study, the structural evolution of high density polyethylene at the nanoscale was investigated by in situ synchrotron small angle X-ray scattering technique under injection molding. The respective structural parameters of kebab lamellae (including the long period, and the average thickness of crystalline lamellae and amorphous phase) and shish formation (such as the radius of gyration, length, and misorientation of the shish) were extensively analyzed from the resulting data. The growth of kebab crystals was found to exhibit a two-step behavior: melting of thin crystallites followed by a recrystallization process occur at the onset of molding whereas an annealing-induced perfectioning of the lamellae is activated at a later stage. In spite of the initial decrease of the shish length and radius, there is an overall increase in the length and misorientation of the shish structure at later times, which can be attributed to a crystallization of partially oriented chains onto the longitudinal surface of the existing shish. The results acquired by the unique combination of this apparatus and synchrotron radiation can provide an effective means to predict the structural formation and modulate the morphology of final products in practical micro-injection molding process of polymers.

专门设计的定制微注射成型设备在填充腔中具有一对金刚石窗口，以模拟实际微成型过程中固有的极端加工条件。这种设置与同步加速器辐射相结合，可以在制造过程中实时研究多尺度结构的发展，从而能够评估一系列聚合物材料的流致结晶特征。在这项研究中，通过原位研究了纳米级高密度聚乙烯的结构演变注射成型同步加速器小角度X射线散射技术 从结果数据中广泛分析了烤肉串片的各个结构参数（包括较长的时间，以及结晶片和无定形相的平均厚度）和烤肉串的形成（例如回转半径，长度和烤肉串的取向错误）。 。发现烤肉串晶体的生长表现出两步行为：在成型开始时发生薄晶粒的熔化，然后发生重结晶过程，而在随后的阶段激活薄片退火退火。尽管初始长度减少了，但在以后的时间中，总体长度却增加了，并且排列方向错误。这可以归因于部分取向的链在现有烟丝的纵向表面上的结晶。通过该装置和同步加速器辐射的独特组合获得的结果可以提供一种有效的手段，以预测聚合物的实际微注射成型工艺中的结构形成并调节最终产品的形态。