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Structures and properties of the compression-molded istactic-polypropylene/talc composites: Effect of cooling and rolling

机译:压缩成型的立构聚丙烯/滑石粉复合材料的结构和性能:冷却和轧制的影响

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摘要

Talc-loaded isotactic polypropylene (iPP) composites with various contents of talc were fabricated by compression molding, following slow- and fast-cooling processes, to obtain slow-cooled samples (SCS) and fast-cooled samples (FCS), respectively. Lamellar thickness of the α-crystal of iPP in the SCS is observed to be larger than that in the FCS by X-ray diffraction study. Rolled fast-cooled samples (RFCS) were also prepared at 25 ℃ in order to examine the crystal growth of iPP. An epitaxial growth mechanism of the a-crystal of iPP from the talc crystal is proposed. Surface of talc-loaded FCS appears with a smaller particle size than that of talc-loaded SCS and RFCS as observed by a scanning electron microscope. Young's modulus and tangent modulus of FCS are found lower than those of SCS with the addition of talc up to 20 wt% and higher above this concentration, except microhardness which is higher in SCS at all contents of talc. From thermal studies, talc-loaded SCS and FCS are found to show higher melting temperature than the neat samples. Effect of cooling and rolling on the structures and properties of the fabricated composites are elaborately discussed.
机译:滑石粉负载不同含量滑石粉的全同立构聚丙烯(iPP)复合材料是通过慢速和快冷过程的压缩成型制造的,分别获得慢冷样品(SCS)和快冷样品(FCS)。通过X射线衍射研究发现,SCS中iPP的α晶体的层状厚度比FCS中的大。为了检查iPP的晶体生长,还在25℃下制备了轧制的快冷样品(RFCS)。提出了滑石晶体中iPP的a晶体的外延生长机理。如通过扫描电子显微镜观察到的,滑石负载的FCS的表面出现的粒度小于滑石负载的SCS和RFCS的粒度。发现滑石粉的杨氏模量和切线模量低于SCS,而滑石粉的添加量高达20 wt%,高于该浓度,但在所有滑石粉含量下,SCS的显微硬度都较高。通过热学研究,发现滑石粉填充的SCS和FCS的熔融温度比纯样品高。详细讨论了冷却和轧制对复合材料结构和性能的影响。

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