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以碳纤维(CF)为填料,聚偏氟乙烯(PVDF)为基体,通过熔融共混法制备PVDF/CF导电复合材料.所得复合材料具有显著的正温度系数(PTC)效应,温度上升到聚合物熔点附近时,电阻率对温度变化敏感.在转折温度区间(155.5~171.0oC,(35)(28)15.5oC)内,其体积电阻率的增加速率约为1.3×105?cm K-1.在不同CF含量下,复合材料表现出不同的PTC行为.随着CF含量的增加,其峰值电阻略有下降.高导电粒子含量下,无负温度系数(NTC)效应.在冷却循环过程,导电网络的重构性良好.复合材料即使经过多次热循环,依然表现出良好的PTC特性重现性.
PVDF / CF conductive composites were prepared by melt blending with carbon fiber (CF) as filler and polyvinylidene fluoride (PVDF) as matrix, the obtained composites had a significant positive temperature coefficient (PTC) effect, and the temperature rose to polymer The resistivity is sensitive to temperature change near the melting point, and the rate of increase of volume resistivity is about 1.3 × 105? Cm K-1 in the transition temperature range (155.5 ~ 171.0oC, (35) (28) and 15.5oC). At different CF contents, the composites showed different PTC behavior, with a slight decrease of peak resistance with the increase of CF content.No negative temperature coefficient (NTC) effect was observed in the case of high conductive particles.In the cooling cycle, the conductivity Reconfiguration of the network is good, and the composite shows good reproducibility of PTC properties even after several thermal cycles.