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研究了以尼龙12(PA12)为基体树脂,炭黑(CB)为导电填料的高转变温度正温度系数(PTC)材料。采用熔融共混方法制备了尼龙12/炭黑聚合物PTC复合材料,考查了炭黑含量,热循环等因素对材料PTC性能的影响。并采用示差扫描量热分析(DSC)、热机械曲线分析(TMA)研究了材料PTC效应与材料结构的关系。实验结果表明:尼龙12/炭黑复合材料具有高转变温度的PTC特性,将复合材料进行多次热循环实验,此复合材料仍具有较强的PTC效应。
The high temperature coefficient of transformation (PTC) materials with nylon 12 (PA12) as matrix resin and carbon black (CB) as conductive fillers were studied. A nylon 12 / carbon black polymer PTC composite was prepared by melt blending. The effects of carbon black content, thermal cycling and other factors on the PTC properties were investigated. The relationship between PTC effect and material structure was investigated by differential scanning calorimetry (DSC) and thermomechanical curve analysis (TMA). The experimental results show that the PTC material with high transition temperature is used for the nylon 12 / carbon black composites. The thermal cycling of the composites is performed several times, and the composite material still has a strong PTC effect.