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以天然鳞片石墨为原料,PVB为黏结剂,PEG和DBP混合物为增塑剂,通过流延工艺在室温下制备了定向排列的石墨/聚合物片层复合材料。系统分析了不同黏结剂用量和流延刀口高度下复合片层材料的定向排列状况,并探讨了定向排列程度对其热导率的影响。XRD和SEM的结果表明,石墨/聚合物复合片层材料显示了不同程度的定向排列。热导率测试结果表明,片层复合材料的热导率随着定向排列程度的提高而增大。通过优化黏结剂的用量和流延刀口高度制备了具有较高热导率的片层复合材料,其热导率最高可达490 W/(m.K)。
Using natural flake graphite as raw material, PVB as binder, and PEG and DBP mixture as plasticizer, oriented graphite / polymer sheet composites were prepared by casting at room temperature. The orientation of the composite sheet material under different adhesive dosage and casting blade height was systematically analyzed, and the influence of orientation degree on the thermal conductivity was also discussed. The results of XRD and SEM show that the graphite / polymer composite sheets show different degrees of orientation. The results of thermal conductivity test show that the thermal conductivity of the composite sheet increases with the degree of orientation. The composite with high thermal conductivity was prepared by optimizing the amount of binder and the height of the casting blade, and its thermal conductivity was up to 490 W / (m · K).