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- 2015
石墨/酚醛树脂复合材料双极板的制备与性能
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Abstract:
双极板是质子交换膜燃料电池的重要组成部分, 石墨与聚合物的复合材料双极板是目前研究的重要方向。采用模压热固化二步法, 以酚醛树脂为粘结剂、天然鳞片石墨为导电骨料、炭黑为添加剂制备了质子交换膜燃料电池用复合材料双极板。系统研究了不同种类石墨对石墨/酚醛树脂复合材料电性能和抗弯强度的影响。结果表明: 以天然鳞片石墨为导电原料时, 所制备的石墨/酚醛树脂双极板的性能最好; 添加导电炭黑能有效提高石墨/酚醛树脂复合材料的电导率; 在复合材料制备中加入4wt%的碳纤维, 碳纤维-石墨/酚醛树脂复合材料的抗弯强度提高了29%; 碳纤维表面液相氧化处理能有效提高纤维与基体间的结合强度, 随着处理时间的延长与处理温度的升高, 碳纤维-石墨/酚醛树脂复合材料的电导率和抗弯强度都有很大程度的提高; 最终固化温度主要影响酚醛树脂的交联程度, 随着最终固化温度的升高, 酚醛树脂的交联程度增加, 电导率增大, 但抗弯强度有一定程度减小。 Bipolar plate is an important part of proton exchange membrane fuel cell. The composite bipolar plate of graphite and polymer is the main direction of research. With phenolic resin as binder, natural flake graphite as conductive aggregate, carbon black as additive, the composite bipolar plate for proton exchange membrane fuel cell was prepared by using the molding and thermosetting two-step method. The effects of graphite species on conductive properties and flexural strength of graphite/phenolic resin composites were investigated and analyzed systematically. The results show that there will be the best performance when the natural flake graphite is used as conductive raw material. The electrical conductivity of the graphite/phenolic resin composites can be effectively improved if conductive carbon black is added. By adding 4wt% carbon fiber into composites, the flexural strength of the carbon fiber-graphite/phenolic resin composites is improved by 29%. The liquid phase oxidation processing of carbon fiber surface can effectively improve the bonding strength between the fibers and matrix. With the extending of processing time and elevating of processing temperature, electrical conductivity and flexural strength of carbon fiber-graphite/phenolic resin composites are greatly improved. The final curing temperature mainly affects the cross-linking degree of phenolic resins. With the increase of final curing temperature, the crosslinking degree of phenolic resin gets increased, and the electrical conductivity increases while flexural strength decreases to a certain extent. 湖南省科技重大专项(2013FJ1001-2);高校青年教师成长计划(531107040186)
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