碳纳米管填充不相容共混物的双PTC效应*

doi:10.11901/1005.3093.2013.668

材料研究学报

2014, Vol. 28

Issue (5): 380-386 DOI: 10.11901/1005.3093.2013.668

本期目录 | 过刊浏览

碳纳米管填充不相容共混物的双PTC效应*

陆昶(

),杨典,王睿,刘继纯,张玉清

河南科技大学化工与制药学院高分子科学与纳米技术校重点实验室洛阳 471003

Double PTC Effect of Carbon Nanotubes Filled Immiscible Polymer Blends

Chang LU(

),Dian YANG,Rui WANG,Jichun LIU,Yuqing ZHANG

Key Lab of Polymer Science and Nanotechnology, Chemical Engineering &Pharmaceutics School, Henan University of Science and Technology, Luoyang 471003

引用本文:

陆昶,杨典,王睿,刘继纯,张玉清. 碳纳米管填充不相容共混物的双PTC效应*[J]. 材料研究学报, 2014, 28(5): 380-386.
Chang LU, Dian YANG, Rui WANG, Jichun LIU, Yuqing ZHANG. Double PTC Effect of Carbon Nanotubes Filled Immiscible Polymer Blends[J]. Chinese Journal of Materials Research, 2014, 28(5): 380-386.

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摘要:

将碳纳米管(CNTs)、苯乙烯马来酸酐无规共聚物(SMA)改性后的CNTs分别与PS/PA6不相容共混体系熔融共混, 制备出PS/PA6/CNTs及PS/PA6/SMA-CNTs导电高分子复合材料, 并研究其PTC效应。结果表明, 对于PS/PA6/CNTs体系, CNTs选择性分布于PA6相, 体系的逾渗阈值为5%(质量分数), 且PTC效应不明显。对于PS/PA6/SMA-CNTs体系, 由于SMA的诱导作用, 使得CNTs分布于PS/PA6共混物相界面及PA6相, 导致体系的逾渗阈值降低至0.112%。PS/PA6/SMA-CNTs体系具有独特的“双PTC效应”, 且其形态结构影响PTC效应的形成机制。对于PA6相为分散相的体系, 其PTC效应是由于PS相的玻璃化转变及PA6相的熔融造成的。对于PS相为分散相及PS/PA6形成双连续相的体系, 其PTC效应是由于PA6相的熔融造成的。

关键词 ：复合材料, 导电高分子复合材料, 碳纳米管, 形态结构, 逾渗阈值, PTC效应

Abstract：

Carbon nanotubes (CNTs) and poly(styrene-co-maleic anhydride) modified CNTs (SMA- CNTs) were blended with an immiscible system polystyrene/nylon6 (PS/PA6) to prepare conductive polymer composites PS/PA6/CNTs and PS/PA6/SMA-CNTs respectively. The PTC (positive temperature coefficient) effect of the composites was investigated. For PS/PA6/CNTs composites, CNTs were selectively distributed in PA6 phase; the percolation threshold was 5% (mass fraction) and a weak PTC effect was observed. For PS/PA6/SMA-CNTs composites, TEM results showed that CNTs were distributed both at the PS/PA6 interface and in PA6 phase due to the induced effect of SMA on CNTs. As a consequence, the percolation threshold decreased to 0.112%. Meanwhile, an especial double PTC effect was observed. The PTC effect was affected by the morphology of PS/PA6 blends. The emerge of PTC effect of the composites with dispersed PA6 phase was attributed to the glass transition of PS phase and the melt of PA6 phase. However, for blends with PS as disperse phase and PS/PA6 as bicontinuous phases, the emerge of PTC effect was due to the melt of PA6 phase.

Key words： composites conductive polymer composites carbon nanotubes morphology percolation threshold positive temperature coefficient

收稿日期: 2013-09-16

基金资助:* 国家自然科学基金51003024和河南省高等学校青年骨干教师资助计划资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.668 或 https://www.cjmr.org/CN/Y2014/V28/I5/380

图1 5% CNTs填充PS/PA6 (40/60)共混体系OM像

图2 采用不同溶剂刻蚀5% CNTs填充PS/PA6 (40/60) 共混体系后的溶液

图3 CNTs及SMA改性CNTs的HRTEM像

图4 6% SMA-CNTs填充PS/PA6 (40/60)共混体系TEM像

图5 CNTs含量的变化对复合体系室温电阻率的影响

图6 不同PA6含量下6% SMA/CNTs填充PS/PA6体系SEM像

图7 不同PA6含量下PS/PA6/SMA-CNTs体系形态结构示意图

图8 PS/PA6/CNTs及PS/PA6/SMA-CNTs体系温阻曲线

图9 PS及PA6的DSC曲线

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