以天然鳞片石墨为导电骨料,乙烯基酯树脂为粘接剂,炭黑为添加剂,采用模压成型工艺制备了质子交换膜燃料电池双极板用乙烯基酯树脂/石墨复合材料.研究了树脂含量、成型工艺条件和炭黑含量对复合材料电导率和弯曲强度的影响,采用扫描电子显微镜、差示扫描量热法和热重分析等技术进行分析表征.实验结果表明:随着树脂含量的增加,材料的电导率下降,弯曲强度上升;施压温度对材料性能影响很明显;适当增大模压压力可有效改善材料的电导率和弯曲强度;成型温度和保温时间主要影响树脂的固化度;材料的电导率和弯曲强度随着炭黑含量增加均呈先增后减的趋势;在树脂质量分数为15％,施压温度为100℃,模压压力18 MPa,成型温度160℃,保温10 min,炭黑质量分数为10％的条件下,样品的电导率和弯曲强度分别可达85.7 S/cm和48.4 MPa.
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