Influence of polymer particle size on the percolation threshold of electrically conductive latex-based composites
Influence of polymer particle size on the percolation threshold of electrically conductive latex-based composites
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DOI：
10.1002/polb.22344
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发表时间：
2011-11
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影响因子：
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通讯作者：
Gregory P. Moriarty;J. H. Whittemore;Katherine Ann Sun;J. W. Rawlins;J. Grunlan
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文献类型：
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作者：
Gregory P. Moriarty;J. H. Whittemore;Katherine Ann Sun;J. W. Rawlins;J. Grunlan
单分散共聚物乳液，每一个具有不同的聚合物颗粒尺寸，被用来研究粒子尺寸对炭黑（CB）填充的隔离网络复合材料的电学和热机械性能的影响。这些乳液是用等摩尔的甲基丙烯酸甲酯和丙烯酸丁酯合成的，胶乳粒径范围为83至771 nm。电逾渗阈值被发现从2.7至1.1体积% CB的胶乳粒径增加。显微结构图像显示减少胶乳聚结，并改善CB偏析，随着胶乳粒径的增加。在一般情况下，聚结被证明是增加所有系统的CB浓度的增加。此外，所有体系都表现出相似的最大电导率平台，为0.7 S cm-1，尽管对于较大的胶乳粒径，浓度较低。这种能力，以定制逾渗阈值与乳胶粒径提供了一个重要的工具，用于操纵的电和机械性能的聚合物纳米复合材料。© 2011 Wiley Periodicals，Inc.聚合物科学杂志B部分：聚合物物理49：1547-1554，2011
Monodispersed copolymer emulsions, each with a different polymer particle size, were used to investigate the effect of particle size on the electrical and thermomechanical properties of carbon black (CB)-filled segregated network composites. These emulsions were synthesized with equal moles of methyl methacrylate and butyl acrylate, with latex particle size ranging from 83 to 771 nm. The electrical percolation threshold was found to decrease from 2.7 to 1.1 vol % CB as the latex particle size was increased. Microstructural images reveal diminished latex coalescence, and improved CB segregation, with increasing latex particle size. In general, coalescence is shown to increase for all systems with increasing CB concentration. Furthermore, all systems exhibited a similar maximum electrical conductivity plateau of 0.7 S cm−1, albeit at lower concentration for larger latex particle size. This ability to tailor percolation threshold with latex particle size provides an important tool for manipulating electrical and mechanical properties of polymer nanocomposites. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 1547–1554, 2011