In this work, 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propylphenyl) methylene]-nonitol (TBPMN) was conscripted as the clarifying agent, the influence of the injection pressure on optical properties of PP were investigated, and results documented that increasing the injection pressure could not improve the transparency of the transparent PP. Thereafter, the crystallization behavior and morphological changes of transparent PP in condensed structure under different injection pressures were studied by the differential scanning calorimetry (DSC), the scanning electron microscopy (SEM) and the dynamic thermomechanical analysis (DMA), respectively, and results presented that change in injection pressure influence crystallization properties significantly. Besed on analyzing of the relationship between structure and optical properties, the effect of pressure on the optical properties was explained as follows: low injection pressure would be facilitated to the transparency of transparent PP, because under low injection pressure, the clarifier fiber could be dispersed uniformly and the network structure was formed and preserved well, and molecular chains of transparent PP was crystallized to the nanometer-level fiber on the surface of nucleation sites, which greatly reduces the scattering of light. However, increasing the injection pressure would promote the fiber itself accumulation into a scatterer point, which not only reduces the effect of the clarifier, but also causes the preferential arrangement of the PP molecules to produce an oriented structure due to strong external force and shearing action, thereby increasing light scattering.

在这项工作中，1,2,3-三苯氧基-4,6：5,7-双-O-[（4-丙基苯基）亚甲基]-壬醇（TBPMN）被定义为澄清剂，受注射压力的影响对PP的光学性能进行了研究，结果表明增加注射压力不能改善透明PP的透明性。此后，分别通过差示扫描量热法（DSC），扫描电镜（SEM）和动态热力学分析（DMA）研究了在不同注入压力下透明PP在缩合结构中的结晶行为和形态变化。注射压力的变化会显着影响结晶性能。通过分析结构和光学特性之间的关系，压力对光学性能的影响解释如下：低注射压力有利于透明PP的透明性，因为在低注射压力下，澄清剂纤维可以均匀分散，网络结构良好形成并保存，并且透明PP的分子链在成核位点表面结晶为纳米级纤维，从而大大减少了光的散射。但是，增加注射压力将促进纤维本身积累到散射点，这不仅降低了澄清剂的作用，而且由于强大的外力和剪切作用，导致PP分子的优先排列以产生定向结构。 ，从而增加了光散射。