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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Talc Genesis and Particle Surface on the Crystallization Kinetics of Polypropylene/Talc Composites
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Influence of Talc Genesis and Particle Surface on the Crystallization Kinetics of Polypropylene/Talc Composites

机译：滑石的产生和颗粒表面对聚丙烯/滑石复合材料结晶动力学的影响

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摘要

Talc is a laminar silicate, considered as an excellent nucleating agent for polypropylene (PP) crystallization. However, properties of PP/talc composites depend on the morphology, size, and surface of mineral particles. In this sense, talc from several ores, having different morphology, imparts specific characteristics on these materials. Also, taking into account that PP-talc adhesion is not necessarily good due to the apolar character of PP, talc surface has been modified in order to increase this parameter. In this work, the effects of talc genesis, geomorphologic aspects, and particle surface characteristics on crystallization of PP/talc composites are analyzed. Isothermal crystallization of PP/talc composites was studied by using differential scanning calorimetry, based on Avrami model. The final crystalline morphology of talc-filled PP was analyzed by means optical microscopy. The results show that the blocky talc morphology favors even more the crystallization compared to the platy one, at the same particle size. Taking into account the surface treatment studied in this work, the talc surface is made hydrophobic and the particle delami-nation is favored. As a consequence, so-modified talc is very effective in increasing the crystallization temperature of PP and the nuclei number that grow during the crystallization with respect to the untreated talc.
机译：滑石是层状硅酸盐，被认为是聚丙烯（PP）结晶的极好的成核剂。但是，PP /滑石复合材料的性能取决于矿物颗粒的形态，大小和表面。从这个意义上说，来自几种矿石的滑石具有不同的形态，赋予这些材料特殊的特性。另外，考虑到由于PP的非极性特性，PP-滑石的粘合性不一定良好，因此对滑石表面进行了改性以增加该参数。在这项工作中，分析了滑石的成因，地貌形态和颗粒表面特征对PP /滑石复合材料结晶的影响。基于Avrami模型，采用差示扫描量热法研究了PP /滑石复合材料的等温结晶。滑石填充的PP的最终晶体形态通过光学显微镜分析。结果表明，在相同粒径下，块状滑石形态比板状形态更有利于结晶。考虑到在这项工作中研究的表面处理，滑石表面被制成疏水性的，并且有利于颗粒的粉化。结果，相对于未处理的滑石，如此改性的滑石在提高PP的结晶温度和在结晶过程中生长的核数方面非常有效。

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