主要研究熔融加工工艺对石墨烯在聚偏氟乙烯(PVDF)中的分散及导电、导热性能的影响。首先通过高速混合机机械搅拌，使石墨烯微片、助剂与PVDF粉料均匀分散，然后分别经由熔融模压、双辊辊压、双辊混炼、双螺杆挤出和密炼等工艺制备得到PVDF/石墨烯复合材料。利用 SEM和 TEM研究复合材料的微观形貌，并研究不同熔融制备工艺及石墨烯含量对复合材料导电性能、导热性能及热力学性能的影响。结果表明，采用高速混合、合适的助剂体系和熔融工艺，可以得到石墨烯分散良好的复合材料；经定向分散熔融制备工艺所得的复合材料导电性能和导热性能均优于不定向分散熔融工艺所得的复合材料；石墨烯的加入，可以改善复合材料的热力学稳定性，提高复合材料的结晶温度。
The paper was aimed to study the effect of various melting process on the distribution of graphene and the resultant conductivity and thermal performances.Graphene was uniformly and mechanic ally dispersed in poly(vinylidene fluoride)(PVDF)by the synergetic action of stearic acid amide,sodium dodecyl sulfate and nano calcium carbonate through the high speed mixer.PVDF/graphene composites were prepared by the follow-ing melting methods:melt molding,molding by a double roll,mixing by a double roll,extruding,mixing by a mixer.The microstructures of the composites were characterized by scanning electron microscopy and transmis-sion electron microscopy.The influences of different methods for melt blending on the conductivity,thermal performance and thermodynamic stability were investigated.The results indicate that graphene can be uniformly dispersed in PVDF to form a function network structure.The composites prepared by melt blending of direc-tional melting process have better conductivity and thermal performances than those prepared by non-directional melting process.With graphene be added,the thermodynamic stability and crystallization temperature of the composites will be improved.
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