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高分子材料作为一种新型导热材料,弥补了传统导热材料如金属、金属合金等抗腐蚀性弱、力学性能差等缺陷,但其导热系数的低下导致了应用范围的局限性,而将高分子材料复合后则能很好的解决这个问题。本文以聚乙烯醇为复合材料基体,氧化石墨烯为无机填充物,经反复冷冻解冻法制备出不同体积分数梯度的氧化石墨烯/聚乙烯醇复合材料。实验采用瞬态电热测试技术对其进行导热性能测试,得出该材料达到导热系数最优点时对应的填料体积分数为25%。在实验的基础上,利用软件拟合得出导热系数值曲线图并建立导热公式,加以验证与分析。
As a new type of thermal conductive material, polymer materials make up for the defects of traditional thermal conductive materials such as metal and metal alloy which have weak corrosion resistance and poor mechanical properties. However, the low thermal conductivity leads to the limitation of the application range. However, After the composite material can be a good solution to this problem. In this paper, polyvinyl alcohol (PVA) matrix was used as the matrix and graphene oxide was used as inorganic filler. Graphene oxide / polyvinyl alcohol composites with different volume fractions were prepared by repeated freezing and thawing methods. The experiment uses the transient electrothermal test technology to conduct the thermal conductivity test, and obtains that the corresponding filler volume fraction when the material reaches the optimal thermal conductivity is 25%. On the basis of experiments, the thermal conductivity curve is obtained by software fitting and the thermal conductivity formula is established, which is verified and analyzed.