2种导电炭黑复合橡胶体系的导热性能研究

研究了2种导电炭黑复合天然橡胶材料的导热性能随着温度和填料用量的变化规律。结果表明,温度对于导电炭黑复合体系导热性能的影响不大。乙炔黑复合体系具有极高的导热性能,随着炭黑用量的增加,其导热性能优势越加明显。据透射电镜观察填料的微观形态,乙炔黑链枝状结构丰富,聚集体之间以面接触为主,这是其复合橡胶导热性能优异的原因,乙炔黑复合材料的热导率与炭黑体积分数呈线性关系。40B2复合体系的热导率与炭黑体积分数呈现逾渗规律,逾渗阈值在炭黑体积分数8.30%至13.63%之间。据扫描电镜观察复合材料的微观结构,逾渗现象与炭黑在基体内的分布密切相关。为更精确地描述填料用量与复合体系热导率的关系,对2种复合体系的热导率与炭黑的体积分数进行了回归。

Research on thermal conductivity of two kinds of conductive carbon black separately filled rubber composites

The relationship about temperature and filler content with thermal conductivity of two kinds of conductive carbon black separately filled natural rubber composites was studied.It showed that temperature has little effect on thermal conductivity.Thermal conductivity of acetylene black filled natural rubber composite is much better,and as filler content increases,the advantage on thermal conductivity becomes increasingly obvious.According to transmission electron microscope,the morphology of filler showed that acetylene black has more botryoidal structure,and particles contact by surface mainly,which maybe the reason for the very good thermal conductivity of composite.And a linear relationship exists in between thermal conductivity of composites and volume percent of carbon black.Percolation phenomenon is found on relationship of thermal conductivity of another Conductive Carbon Black 40B2 filled rubber composites with volume percent of the filler,and percolation threshold is in between 8.3% and 13.63%.According to scanning electron microscope,the morphology of composites showed that the distribution of carbon black in rubber matrix is closely related to the percolation behavior.In order to describe the relationship of filler content and thermal conductivity more accurately,regression equations of both composites were achieved.