Herein a new polymer processing method referred to as Melt‐Mastication (MM) is presented as way to substantially improve the thermal and mechanical properties of Polypropylene (iPP) and other semi‐crystalline polymers. MM is a low temperature mixing technique that subjects molten iPP to chaotic flow under at temperatures between the melting and crystallization temperatures, thereby promoting flow induced crystallization (FIC). The resulting materials demonstrate an unusual crystal morphology that is highly crystalline by thermal calorimetry (57% crystal volume fraction), melts at a temperature 10.3 K higher than conventionally processed iPP, and demonstrates melt memory after annealing at 200°C. The highly crystalline morphology does not show birefringence in polarized optical microscopy and by SEM and AFM appears to be comprised of largely disorganized lamellar crystals, with possible stacked ordering in local (~1 μm) regions. Melt‐Masticated iPP demonstrates improved compressive modulus (+77%), strength (+40%), and strain hardening modulus in uniaxial compression, which are attributed to enhanced crystal volume fraction, lamellar crystal thickness, and network connectivity, respectively. POLYM. ENG. SCI., 60: 380–386, 2019. © 2019 Society of Plastics Engineers

中文翻译：

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等规聚丙烯的熔融咀嚼改善热和物理性能

在此，提出了一种新的称为熔体雾化（MM）的聚合物加工方法，可以从根本上改善聚丙烯（iPP）和其他半结晶聚合物的热性能和机械性能。MM是一种低温混合技术，可使熔融的iPP在熔融和结晶温度之间的温度下经受混沌流动，从而促进流动诱导结晶（FIC）。所得材料表现出不寻常的晶体形态，其通过热量热法具有高结晶度（晶体体积分数为57％），在比常规加工的iPP高10.3 K的温度下熔融，并在200°C退火后表现出熔融记忆。高度结晶的形态在偏振光学显微镜下未显示出双折射，并且通过SEM和AFM似乎由高度杂乱的层状晶体组成，并且可能在局部（〜1μm）区域内堆积。熔融-熔融iPP表现出改善的单轴压缩压缩模量（+ 77％），强度（+ 40％）和应变硬化模量，这分别归因于提高的晶体体积分数，层状晶体厚度和网络连通性。POLYM。ENG。SCI。，60：380–386，2019.©2019塑料工程师协会 层状晶体厚度和网络连通性。POLYM。ENG。SCI。，60：380–386，2019.©2019塑料工程师协会 层状晶体厚度和网络连通性。POLYM。ENG。SCI。，60：380–386，2019.©2019塑料工程师协会