Effect of different inorganic filler over isothermal and non-isothermal crystallization of polypropylene homopolymer

被引:0
作者
Vera Alejandra Alvarez
Claudio Javier Pérez
机构
[1] National University of Mar del Plata (UNMdP),Research Institute of Material Science and Technology (INTEMA), Engineering Faculty
来源
Journal of Thermal Analysis and Calorimetry | 2012年 / 107卷
关键词
Crystallization; Polypropylene; Modeling; Fillers; Compatibility;
D O I
暂无
中图分类号
学科分类号
摘要
In this study, the effect of several inorganic fillers: silicon oxide (SiO2), nanoclay (C20A), alumina (Al2O3), and calcium carbonate (CaCO3) on the crystallization behavior of polypropylene were analyzed for composites with fixed filler content (5 mass%) prepared by intensive mixing following by compression molding. In addition, for calcium carbonate, which produces the highest increase on toughness, PP grafted with maleic anhydride (PP-g-MA) was added to enhance the compatibility. In that case, different content of particles was used (from 5 to 20 mass%) and the synergic effect of both incorporations was demonstrated. For this purpose, isothermal and non-isothermal crystallization tests were carried out in the bulk (by differential scanning calorimetry). In addition, the spherulitic growth was studied (by optical microscopy). Different models were used to predict the relative degree of crystallinity and several parameters were analyzed. All results indicate that whereas alumina and calcium carbonate acted as nucleating agents, silica and nanoclay displayed an opposite behavior. The full models that take into account the different parameters during cooling under isothermal and non-isothermal conditions were used to construct continuous cooling transformation and time temperature transformation diagrams. Both kind of diagrams provide a fundamental tool to understand the crystallization behavior of studied composites and are useful to determine the processing conditions.
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页码:633 / 643
页数:10
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