【摘要】 以碳纤维作为功能纤维，以间位芳纶为基体，通过造纸湿法成形工艺制备了具有导电和导热功能的纸基复合材料，研究了通用型PAN基碳纤维（F1）、石墨型PAN基碳纤维（F2）和中间相沥青基碳纤维（F3）对纸基复合材料电导率和导热系数的影响规律。研究结果表明，当碳纤维长度为6 mm，且以单位体积内碳纤维根数表示纸基复合材料中碳纤维含量时，添加F1、F2、F3三种碳纤维的纸基复合材料的电导率逾渗阈值接近，分别为0.9×10⁴根·cm^-3、1.2×10⁴根·cm^-3、1.1×10⁴根·cm^-3。当F3型碳纤维含量为8×10⁴根·cm^-3时，纸基复合材料的面内导热系数可达到1.06 W·m^-1·K^-1，而由于纸基复合材料厚度方向存在大量热界面，厚度方向导热系数随碳纤维种类和含量变化不明显，均为0.03～0.05 W·m^-1·K^-1左右。更多还原

【Abstract】 Paper-based composites with electrical and thermal conductive properties were prepared by paper wet forming process using carbon fibers as functional fibers and meta-aramid as matrix.The effects of general-purpose PAN-based carbon fiber（F1）,graphitized PAN-based carbon fiber（F2） and mesophase pitch-based carbon fiber（F3） on the electrical conductivity and thermal conductivity of paper-based composites were studied.The results show that when the length of carbon fibers is 6 mm and the content of carbon fibers in paper-based composites is expressed by the number of carbon fiber per unit volume,the electrical conductivity percolation threshold of paper-based composites with F1,F2 and F3 are close,which are 0.9×10⁴·fibers·cm^-3,1.2×10⁴·fibers·cm^-3and 1.1×10⁴·fibers·cm^-3,respectively.When the content of F3 is 8×10⁴·fibers·cm^-3,the in-plane thermal conductivity of paperbased composites can reach 1.06 W·m^-1·K^-1.However,due to the existence of a large number of thermal interfaces in the through plane direction of the paper-based composites,the thermal conductivity in the through plane direction does not change significantly with the type and content of carbon fiber,ranging from 0.03 to 0.05 W·m^-1·K^-1.更多还原