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首页> 外文期刊>Journal of Applied Polymer Science >Poly(propylene)-poly(propylene)-grafted maleic anhydride-organic montmorillonite (PP-PP-g-MAH-Org-MMT) nanocomposites. II. Nonisothermal crystallization kinetics
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Poly(propylene)-poly(propylene)-grafted maleic anhydride-organic montmorillonite (PP-PP-g-MAH-Org-MMT) nanocomposites. II. Nonisothermal crystallization kinetics

机译：聚（丙烯）-聚（丙烯）接枝的马来酸酐-有机蒙脱土（PP-PP-g-MAH-Org-MMT）纳米复合材料。二。非等温结晶动力学

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摘要

The nonisothermal crystallization kinetics of poly(propylene) (PP), PP-organic-montmorillonite (Org-MMT) composite, and PP-PP-grafted maleic anhydride (PPg-MAH)-Org-MMT nanocomposites were investigated by differential scanning calorimetry (DSC) at various cooling rates. Avrami analysis modified by Jeziorny and a method developed by Mo well-described the nonisothermal crystallization process of these samples. The difference in the exponent n between PP and composite (either PP-Org-MMT or PP-PP-g-MAH-Org-MMT) indicated that nonisothermal kinetic crystallization corresponded to tridimensional growth with heterogeneous nucleation. The values of half-time, Z(c); and F(T) showed that the crystallization rate increased with the increasing of cooling rates for PP and composites, but the crystallization rate of composites was faster than that of PP at a given cooling rate. The method developed by Ozawa can also be applied to describe the nonisothermal crystallization process of PP, but did not describe that of composites. Moreover, the method proposed by Kissinger was used to evaluate the activation energy of the mentioned samples. The results showed that the activation energy of PP-Org-MMT was much greater than that of PP, but the activation energy of PP-PP-g-MAH-Org-MMT was close to that of pure PP. Overall, the results indicate that the addition of Org-MMT and PP-g-MAH may accelerate the overall nonisothermal crystallization process of PP. (C) 2003 Wiley Periodicals, Inc. [References: 22]
机译：通过差示扫描量热法研究了聚丙烯（PP），PP-有机蒙脱土（Org-MMT）复合材料和PP-PP接枝马来酸酐（PPg-MAH）-Org-MMT纳米复合材料的非等温结晶动力学（ DSC）在各种冷却速率下。 Jeziorny改进的Avrami分析和Mo开发的方法很好地描述了这些样品的非等温结晶过程。 PP和复合材料（PP-Org-MMT或PP-PP-g-MAH-Org-MMT）之间的指数n的差异表明，非等温动力学结晶对应于具有异质成核的三维生长。半场时间的值Z（c）; F（T）表明，PP和复合材料的结晶速率随冷却速率的增加而增加，但在给定的冷却速率下，复合材料的结晶速率比PP快。 Ozawa开发的方法也可用于描述PP的非等温结晶过程，但未描述复合材料的非等温结晶过程。此外，基辛格提出的方法被用来评估所述样品的活化能。结果表明，PP-Org-MMT的活化能远大于PP，但PP-PP-g-MAH-Org-MMT的活化能接近纯PP。总体而言，结果表明，添加Org-MMT和PP-g-MAH可能会加速PP的整体非等温结晶过程。 （C）2003 Wiley Periodicals，Inc. [参考：22]

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