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Nonisothermal crystallization of PPano-SiO2 composites

机译:PP /纳米SiO2复合材料的非等温结晶

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The kinetics of nonisothermal crystallization of polypropylene (PP) containing nanoparticles of silicon dioxide (SiO2) were investigated by differential scanning calorimetry (DSC) at various cooling rates. Several different analysis methods were used to describe the process of nonisothermal crystallization. The results showed that the Ozawa equation and Mo's treatment could describe the nonisothermal crystallization of the composites very well. The nano-SiO2 particles have a remarkable heterogeneous nucleation effect in the PP matrix. The rate of crystallization of PPano-SiO2 is higher than that of pure PP. By using a method proposed by Kissinger, activation energies have been evaluated to be 262.1, 226.5, 249.5, and 250.1 kJ/mol for nonisothermal crystallization of pure PP and PPano-SiO2 composites with various SiO2 loadings of 1, 3, and 5%, respectively. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1013-1019, 2004. [References: 27]
机译:通过差示扫描量热法(DSC)在各种冷却速率下研究了含有二氧化硅(SiO2)纳米颗粒的聚丙烯(PP)的非等温结晶动力学。几种不同的分析方法用于描述非等温结晶过程。结果表明,Ozawa方程和Mo的处理可以很好地描述复合材料的非等温结晶。纳米SiO2颗粒在PP基体中具有显着的异质成核作用。 PP /纳米SiO2的结晶速率高于纯PP。通过使用基辛格(Kissinger)提出的方法,对于纯PP和具有1、3和5各种SiO2负载量的纯PP和PP /纳米SiO2复合材料的非等温结晶,活化能被评估为262.1、226.5、249.5和250.1 kJ / mol。 %, 分别。 (C)2003 Wiley Periodicals,Inc. J Appl Polym Sci 91:1013-1019,2004。[参考:27]

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