【摘要】 通过超声分散方法制备了聚偏氟乙烯/多壁碳纳米管复合材料,研究了复合材料的形态结构、导电性和热膨胀性质。扫描电镜观察表明碳纳米管被均匀地分散在聚偏氟乙烯基体中。虽然碳纳米管和聚偏氟乙烯之间存在相互作用,但超声并没有引起聚偏氟乙烯的化学交联。同时还研究了复合材料的导电性和正温度系数效应,发现这些复合材料具有较低的逾渗阈值,掺入少量碳纳米管就可使聚偏氟乙烯/碳纳米管复合材料的导电性获得明显改善。此外,碳纳米管的添加能够明显降低聚偏氟乙烯/碳纳米管复合材料的热膨胀系数。更多还原

【Abstract】 Poly(vinylidene fluoride) (PVDF)/multiwalled carbon nanotube (MWCNT) composites were prepared by ultrasonic dispersion process. The morphology,conductivity and thermal expansion of these composites were studied. Scanning electronic microscopy observations indicate that the MWCNTs are uniformly dispersed in the PVDF matrices. There is an interaction between MWCNT and PVDF,but no chemical crosslinking is detected in the sonicated composites. The measurements of conductive properties show that the composites have a low percolation threshold and exhibit high levels of electrical conductivity. Positive temperature coefficient effect of the composite with 1.5% MWCNT loading was also investigated. Furthermore,the addition of MWCNTs into PVDF matrices significantly decreases the coefficient of thermal expansion of the composites.更多还原