[题名] 石墨烯-全氟烷氧基复合材料的制备及其热力学性能

[作者] Wanlong Zhang , Haibin Zuo , Xinru ZhangI , Jingsong Wang , Longfei Guo and Xing Peng

[摘要] 全氟烷氧基（PFA）材料在酸性或碱性环境下都具有良好的耐腐蚀性；因此，钢制热交换器被PFA制成的换热器所取代。然而，PFA的低导热率降低了其传热效率。基于石墨烯极高的导热性，提出了一种能同时满足传热和耐腐蚀要求的新型石墨烯-pfa复合材料。采用超声波分散技术分散复合材料中聚集的石墨烯。采用热压法制备了不同石墨烯含量、不同分散溶剂的石墨烯-聚氟脂肪酸复合材料，并研究了其导热性、耐磨性、结晶性和热解性能。石墨烯含量为20 wt %的PFA复合材料的导热系数达到5.017W（m·k）−1，为纯PFA的21.88倍。得到了不同石墨烯含量下复合材料的磨损损失与摩擦系数的关系。采用热重分析仪对低温材料进行了研究。

[关键词] PFA、石墨烯、分散性、复合材料、耐磨性、导热系数

[Title] Preparation of Graphene-Perfluoroalkoxy Composite and Thermal and Mechanical Properties

[Author] Wanlong Zhang, Haibin Zuo, Xinru Zhang , Jingsong Wang , Longfei Guo and Xing Peng

[Abstract] Perfluoroalkoxy (PFA) material exhibits perfect corrosion resistance under both acid or alkaline circumstances; thus, steel heat exchangers are being substituted by those made of PFA in high corrosion atmospheres. However, the low thermal conductivity of PFA degrades its heat transfer efficiency. Based on the extremely high heat conductivity of graphene, a novel grapheme-PFA composite was proposed to simultaneously meet the demands of heat transfer and corrosion resistance. Ultrasonic dispersion technology was used to disperse the aggregated graphene in the composite. Graphene–PFA composites with different graphene contents and using different dispersing solvents were prepared with a hot pressing method, and thermal conductivity, abrasion resistance, crystallization and pyrolysis properties were investigated. The thermal conductivity of PFA composites with graphene content of 20 wt % reached 5.017 W (m·k)−1 , which is 21.88 times that of pure PFA. The relationship between the abrasion loss and the friction coefficient of the composites with different graphene contents was obtained. A thermogravimetric analyzer was used to investigate the crystallization and pyrolysis behavior of the composites; correspondingly, the temperature range that composites work in was determined. The heat conduction mechanism was analyzed through the thermal conductivity model of composite materials. The composite material is expected to play an important role in the development of high-performance thermal equipment.

 [Keywords] graphene; dispersion; composites; wear-resistant; thermal conductivity