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OALib Journal期刊
ISSN: 2333-9721
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碳纳米管填充不相容共混物的双ptc效应*
Keywords: 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:
？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。
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