The role of mold temperature on the morphology and properties of rotational shearing polyethylene (PE) pipes was studied via a self-developed rotational shear system (RSS). The result indicated that when the mold temperature was 150 °C, the hoop tensile strength and Vicat softening temperature were enhanced rapidly, which were 383.6% and 137.9% higher than those of the conventional PE pipes, respectively. Morphology and crystal structure studies by SEM and DSC revealed that once the rotational shear was applied, the shish-kebab structure began to appear. With the increase of the mold temperature, due to the relaxation of most of the oriented molecular chains, the preservation of shish-kebab structure became difficult. When the mold temperature was 190 °C, only the inner layer of the pipes, where the cooling rate was the largest, could preserve the shish-kebab structure. According to WAXD, there was less shish structure, and the growth of kebab was distorted in the inner layer of the pipes at 210 °C. The result of SAXS suggested that the length of shish changed most within the temperature range from 170 °C to 190 °C. The results of DSC and WAXD showed less change in crystallinity and degree of orientation between the two temperatures. It can be concluded that the reduction of shish length leads to a decrease in mechanical properties and heat-resistance.

模具温度对形态和旋转剪切聚乙烯的性能的作用（PE）管进行了研究通过自行开发的旋转剪切系统（RSS）。结果表明，当模具温度为150°C时，环向拉伸强度和维卡软化温度迅速提高，分别比常规PE管高383.6％和137.9％。通过SEM和DSC进行的形貌和晶体结构研究表明，一旦施加旋转剪切力，烤肉串结构便开始出现。随着模具温度的升高，由于大多数取向分子链的松弛，烤肉串结构的保存变得困难。当模具温度为190°C时，只有冷却速度最大的管道内层才能保留烤肉串结构。根据WAXD的说法，shish结构较少，210°C时，烤肉串的生长在管道内层变形。SAXS的结果表明，光泽长度在170°C至190°C的温度范围内变化最大。DSC和WAXD的结果表明在两个温度之间结晶度和取向度的变化较小。可以得出结论，缩短长度会导致机械性能和耐热性降低。