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研究了导电炭黑40b2填充天然橡胶复合材料的导热性能和力学性能随炭黑体积分数的变化规律,并采用扫描电子显微镜观察了炭黑橡胶体系内部的炭黑分布状况。结果表明,导热性能随炭黑体积分数的变化规律存在类似于导电逾渗现象的导热逾渗现象,逾渗阈值在8.3%～13 63%之间。在逾渗阈值之后,复合材料的拉伸强度下降。炭黑橡胶复合材料的导热性能与其微观结构紧密相关。当炭黑分数达到逾渗阈值之时,炭黑在胶料内部形成长程联结,随着炭黑体积分数进一步增加,炭黑长链数目增多,当炭黑体积分数达到26.2%时,形成了三维导热网络。继续增加炭黑体积分数,导热网络加密,导热性能改善趋于平缓。
The thermal conductivity and mechanical properties of natural rubber composites filled with conductive carbon black 40b2 were studied with the change of volume fraction of carbon black. The distribution of carbon black inside carbon black rubber system was observed by scanning electron microscopy. The results show that the percolation phenomenon of thermal conductivity with the change of volume fraction of carbon black has the similar phenomenon of percolation. The percolation threshold is between 8.3% and 13.63%. After the percolation threshold, the tensile strength of the composites decreased. The thermal conductivity of carbon black rubber composites is closely related to its microstructure. When the carbon black fraction reaches the percolation threshold, carbon black forms a long-range bond inside the rubber compound. With the further increase of the carbon black volume fraction, the number of carbon black long chains increases. When the carbon black volume fraction reaches 26.2%, a three-dimensional Thermal network. Continue to increase the volume fraction of carbon black, thermal network encryption, thermal conductivity to improve the smooth.