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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