The structural evolution of micro-injection molded high density polyethylene (HDPE) at the molecular and lamellar levels was investigated as a function of temperature during heating process using wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS) techniques. The molded sample exhibits a peculiar multilayer structure of skin and shear layers, and is marked by the existence of shish-kebab-like structure with two populations of lamellar stacks. The variations of the long period as well as the average thicknesses of lamellar and amorphous regions with temperature were determined from one-dimensional correlation functions for the respective lamellar stacks. The average length and the misorientation of shish-like formation were calculated using Ruland equation, and the results indicate that the shish-like structure grows in the longitudinal direction with increasing temperature via incorporation of several partially relaxed chains as a result of autocatalytic process. In addition, the degree of orientation of the chains in the crystalline phase was found to increase slightly with increasing temperature below 100 °C, which could be traced back to the formation of additional crystallites with a low degree of orientation after injection molding. These crystalline lamellae built up during the secondary crystallization are less thermally stable than the primary ones, and therefore are melted selectively upon annealing at relatively lower temperatures yielding an overall increase in the molecular orientation.

使用广角X射线衍射（WAXD）和小角度X射线散射（SAXS）研究了加热过程中温度和温度的微注射成型高密度聚乙烯（HDPE）在分子和层状结构的结构演变技术。模制样品表现出独特的表皮层和剪切层多层结构，并具有类似烤肉串状结构和两个层状堆叠的特征。从各个层状叠层的一维相关函数确定了长周期的变化以及层状和非晶态区域的平均厚度随温度的变化。使用Ruland方程计算出平均长度和类烟味形成的取向错误，结果表明，由于自身催化过程的缘故，通过引入一些部分松弛的链，类似烤肉的结构在纵向上随着温度的升高而生长。另外，发现结晶相中链的取向度随温度低于100°C的升高而略有增加，这可以追溯到注射成型后形成低取向度的其他微晶。这些在次要结晶过程中积聚的结晶薄片的热稳定性低于一次结晶，因此在相对较低的温度下退火时选择性地熔融，从而整体上提高了分子取向。