Online shear viscosity and microstructure of PP/nano-CaCO3 composites produced by different mixing types
Online shear viscosity and microstructure of PP/nano-CaCO3 composites produced by different mixing types
复制标题
不同混合方式制备的PP/纳米CaCO3复合材料的在线剪切粘度和微观结构
DOI：
10.1007/s10853-008-2763-2
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发表时间：
2008-06
影响因子：
4.5
通讯作者：
Jiang, Guo
中科院分区：
文献类型：
--
作者：
Huang, Han-Xiong;Jiang, Guo
本文通过测量聚丙烯/纳米碳酸钙复合材料在复合过程中的熔体剪切粘度，探讨其流变行为与微观结构的关系。分析了分散混合、分布混合和混沌混合对纳米复合材料在线剪切粘度和微观结构的影响。结果表明，当纳米caco3含量低于5%、10%和15%时，分别采用高分散混合、分散/分布混合和分散/分布/混沌混合的复合方式，纳米复合材料的在线剪切粘度低于纯PP。这与纳米颗粒在PP基体中的分散有很大关系。推导出粒径小于100 nm的纳米caco3存在临界百分比（Φcr）和临界平均直径（dcr）。当掺量大于临界掺量且平均直径小于临界直径时，剪切粘度低于纯PP。在这项工作中，临界百分比为80%，临界平均直径为60 nm。
In this work, the online melt shear viscosity of polypropylene/nano-calcium carbonate composites was measured during the compounding to investigate the relationship between their rheological behavior and microstructure. Effects of dispersive mixing, distributive mixing, and chaotic mixing on online shear viscosity and microstructure of nanocomposites were analyzed. The results showed that the online shear viscosity of nanocomposites is lower than that of pure PP, when the nano-CaCO3 content is lower than 5, 10, and 15 wt%, compounded by high dispersive mixing, dispersive/distributive mixing, and dispersive/distributive/chaotic mixing, respectively. This is greatly related with the dispersion of nanoparticles in PP matrix. It is deduced that there exists a critical percentage (Φcr) of the nano-CaCO3 with size lower than 100 nm and a critical mean diameter (dcr). The shear viscosity is lower than that of pure PP when the percentage is higher than the critical percentage and the mean diameter is lower than the critical diameter. In this work, the critical percentage is 80% and critical mean diameter is 60 nm.
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