The effects of a partially melted crystal structure (PMCS) on enhancing the cell nucleating behavior, as well as on the related foaming behavior of isotactic polypropylene (iPP), were investigated. The incorporation of PMCS and the corresponding effects were characterized by rheological, thermal and X-ray testing methods. The microcellular foaming results revealed that the addition of PMCS could dramatically increase the melt strength and the cell nucleating sites of the matrix. The synergistic effects of the PMCS and high melt strength polypropylene (HMSPP) could decrease the average cell size to approximately 2 μm and increase the cell density to 1.49×10¹¹ cells/cm³. Additionally, the gradual melting of the PMCS could also prove its enhancing effect on the melt strength and cell nucleating ability. The uniform microcellular cells obtained could positively affect the notched impact strength of the foamed iPP-HMSPP blends.

研究了部分熔融晶体结构（PMCS）对增强泡孔成核行为以及等规聚丙烯（iPP）相关起泡行为的影响。通过流变，热和X射线测试方法表征了PMCS的掺入和相应的作用。微孔泡沫化结果表明，添加PMCS可以显着提高基质的熔体强度和细胞成核位点。PMCS和高熔体强度聚丙烯（HMSPP）的协同作用可将平均孔尺寸减小到大约2μm，并将孔密度增加到1.49×10 ^11个/ cm ³。另外，PMCS的逐渐熔化也可以证明其对熔体强度和细胞成核能力的增强作用。获得的均匀的微孔细胞可以积极地影响泡沫iPP-HMSPP共混物的缺口冲击强度。