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首页> 外文会议>Proceedings of 2007 International Conference on Advanced Fibers and Polymer Materials >Effect of Nano-SiO<,2> Filler on Crystal Nucleation and Morphology of Polypropylene
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Effect of Nano-SiO<,2> Filler on Crystal Nucleation and Morphology of Polypropylene

机译：纳米SiO 2填料对聚丙烯晶体成核和形貌的影响

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Polymer based nano-composites are a new class of materials exhibiting better property improvements as compared to the polymer-conventional particle composites. Considerable research has been devoted to the understanding of the mechanism of property improvement as well as to the development of physical structure during solidification of the resin in presence of the filler particles. In crystalline polymers structure development during solidification from the melt involves crystallization, and the effect of the filler particles on crystallization behaviour of the matrix polymer is of immense importance in ultimate properties of the composite. In this paper, we present a study of crystallization of polypropylene (PP) in PPano-SiO<,2> composite. Crystallization behaviour was studied by differential scanning calorimetry (DSC), through measurement of nonisothermal crystallization exotherms. Changes produced in the crystallization exotherms were analysed and interpreted for the effect of nano-SiO <,2> filler on nucleation and growth rates, degree of crystallinity and crystal size distribution at varying filler content of the composite. The results are discussed in the light of already reported effects of other conventional fillers to highlight the specific role of the nano-filler. Non-isothermal crystallization data recorded at varying cooling rates were analysed by Avrami equation modified by Jeziorny to determine the effect of the nano-particle filler on nucleation and crystallization growth of PP crystallization. The results clearly indicated that the nano-silica filler acted as a effective nucleating agent for PP and the efficiency of nucleating effect varied with the cooling rate. Corresponding changes in crystallization parameters and morphology are also discussed.
机译：基于聚合物的纳米复合材料是一类新型材料，与传统的聚合物复合材料相比，其性能得到了改善。已经有大量的研究致力于理解性能改进的机理以及在填料颗粒存在下树脂固化过程中物理结构的发展。在结晶聚合物中，从熔体凝固的过程中结构的发展涉及结晶，并且填料颗粒对基体聚合物结晶行为的影响对于复合材料的最终性能极为重要。在本文中，我们提出了在PP /纳米SiO，2复合材料中聚丙烯（PP）结晶的研究。通过差示扫描量热法（DSC），通过测量非等温结晶放热来研究结晶行为。分析和解释了在结晶放热中产生的变化，以了解纳米SiO 2，2填料对复合材料中不同填料含量的成核和生长速率，结晶度和晶体尺寸分布的影响。根据已经报道的其他常规填料的作用来讨论结果，以突出纳米填料的特殊作用。通过Jeziorny修正的Avrami方程分析了在不同冷却速率下记录的非等温结晶数据，以确定纳米颗粒填料对PP结晶的成核和结晶生长的影响。结果清楚地表明，纳米二氧化硅填料充当PP的有效成核剂，并且成核效果的效率随冷却速率而变化。还讨论了结晶参数和形态的相应变化。

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