干法球磨原位剥离石墨对聚苯乙烯复合材料导热和力学性能的影响
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四川大学高分子研究所

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四川省国际科技创新合作项目(2022YFH0090)


Effects of In Situ Exfoliation of Graphite via Dry Ball Milling on Thermal Conductivity and Mechanical Properties of Polystyrene Composites
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    摘要:

    相较于传统的湿法球磨,干法球磨剥离石墨(Graphite, GT)制备石墨纳米片耗时更短,且无需任何溶剂,环保低能。本文选用与GT具有较强界面相互作用的聚苯乙烯(Polystyrene, PS)和氢化苯乙烯-丁二烯嵌段共聚物接枝马来酸酐(Maleic anhydride-g-(styrene-ethylene-butadiene-styrene), SEBS-g-MAH)作为固态分散介质,原位干法球磨剥离GT得到了石墨纳米片,通过密炼加工和微型注塑成型制备了PS复合材料,分析了填料在基体中的形态结构和分散状态对PS复合材料导热和力学性能的影响。实验结果表明:与未球磨GT相比,石墨纳米片与基体界面相互作用更强,分散更均匀且呈取向排列,PS复合材料导热性能提高了27.5%,缺口冲击强度提高了14.9%。

    Abstract:

    Compared with traditional wet ball milling, exfoliation of graphite (GT) via dry ball milling takes less time to prepare graphite nanosheets, does not require any solvent, and is environmentally friendly and low energy. In this paper, graphite nanosheets was obtained via in situ peeling of graphite in the presence of solid diluents, polystyrene (PS) and maleic anhydride-g-(styrene-ethylene-butadiene-styrene) (SEBS-g-MAH). The solid diluents (PS and SEBS-g-MAH) can form strong interfacial interactions with the GT surface. Then, PS composites were prepared by melt blending and micro-injection, and the effects of the morphological structure and dispersion state of fillers in the matrix on the thermal conductivity and mechanical properties of PS composites were analyzed. Compared with non-ball milled GT, the graphite nanosheets have stronger interfacial interaction with the matrix and are more uniformly dispersed in the PS matrix with oriented arrangement, the thermal conductivity of PS composites is increased by 27.5%, and the notched impact strength is increased by 14.9%.

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  • 收稿日期:2022-04-19
  • 最后修改日期:2022-05-07
  • 录用日期:2022-06-16
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