Polypropylene (PP) foamed products have the advantages of heat and chemical resistance, but it is difficult to foam without modified PP. Traditionally, researchers have used chemical modification to increase the melt strength to improve the foaming properties of PP. In this article, we designed four kinds of screw combinations, and five regions are selected for sampling. The polytetrafluoroethylene (PTFE) and isotactic polypropylene (iPP) were blended by one-step fiber forming method, and then we tested the rheological properties and foaming properties. It is found that the rheological properties of the in situ microfiber composite are significantly improved than the iPP, and the crystallization temperature is also increased. The foaming experiment of the composite showed that the foaming performance of the composite with in situ microfiber morphology was significantly improved compared with the pure iPP performance, and the foaming temperature window of iPP was widened from 3°C to more than 6°C.

中文翻译：

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原纤化聚四氟乙烯与全同立构聚丙烯共混物的发泡性能评价

聚丙烯（PP）发泡制品具有耐热、耐化学性等优点，但没有改性PP则难以发泡。传统上，研究人员使用化学改性来增加熔体强度以改善 PP 的发泡性能。在本文中，我们设计了四种螺杆组合，并选择了五个区域进行采样。聚四氟乙烯（PTFE）和全同立构聚丙烯（iPP）通过一步成纤法共混，然后我们测试了流变性能和发泡性能。发现原位超细纤维复合材料的流变性能比iPP显着提高，结晶温度也有所提高。