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采用静电纺丝技术制备了多壁碳纳米管/聚氨酯(MWNTs/PU)复合超细纤维,并收集成无纺布薄膜,采用热失重分析仪(TGA)和动态力学分析仪(DMA)分析了纤维的热稳定性。利用数字高阻计(PC68)和LorestaGP电阻计测量了纤维薄膜的直流电导率随MWNTs含量的变化关系。为了研究该多孔薄膜的动态电学性能,同时采用Agilent 4294A阻抗分析仪测试了纤维薄膜的电导率在40 Hz~110 MHz频率范围内的变化关系,并与浇注试样的结果进行比较。结果表明,随MWNTs在PU纤维中含量的增加,复合纤维的热稳定性提高。当MWNTs质量分数达40%时,PU的电导率提高近1010倍。
The multi-walled carbon nanotubes / polyurethane (MWNTs / PU) composite ultrafine fibers were prepared by electrospinning technology and were collected into non-woven fabric films. The films were characterized by TGA and DMA Thermal stability of the fiber. The relationship between the DC conductivity and the MWNTs content of the fiber films was measured by using digital resistivity meter (PC68) and LorestaGP resistance meter. In order to study the dynamic electrical properties of the porous film, the conductivity of the fiber membrane was tested in the frequency range from 40 Hz to 110 MHz with the Agilent 4294A impedance analyzer. The results were compared with those of the cast samples. The results show that with the increase of MWNTs content in PU fibers, the thermal stability of the composite fibers increases. When the mass fraction of MWNTs reaches 40%, the conductivity of PU increases nearly 1010 times.