硬脂醇改性的氧化石墨烯/正十八烷复合相变材料的热物性研究

向正十八烷中加入高导热填充物形成复合相变材料（PCM），可以很好地提升其导热性能，同时，为了保证符合相变材料的高热导率、分散性和再循环可靠性，利用硬脂醇修饰氧化石墨烯（GO），形成改性石墨烯（MG）与正十八烷的复合相变材料。分别制备了改性石墨烯质量分数为0、1%、2%、3%、4%（质量）的改性石墨烯/正十八烷复合相变材料，并经过扫描电镜测试、红外光谱分析、差示扫描量热实验及导热分析等测试对其形貌结构及热物性进行表征和研究。实验表明制备的改性石墨烯/正十八烷复合相变材料具有很好的分散性；当纳米石墨烯片的质量分数达到4%时，复合相变材料的热导率相对于纯正十八烷高出了131.9%。

Study on thermal properties of stearyl alcohol modified graphene oxide/n-octadecane composite phase change materials

Adding high thermal conductivity fillers to n-octadecane to form a composite phase change material(PCM) can improve its thermal conductivity. At the same time, to ensure high thermal conductivity, dispersion stability and recycling reliability of PCM, a type of composite PCM has been fabricated by grafting stearic alcohol onto graphene oxide (GO). The modified graphene/n-octadecane composite PCMs with 0, 1%, 2%, 3% and 4%(mass) of modified graphene were prepared to characterize and study of feature structure and thermophysical properties by means of scanning electron microscope, infrared spectrum analysis, differential scanning calorimetry and thermal conductivity analysis, etc. Experiments show that the modified graphene/n-octadecane composite PCMs prepared in this paper has good dispersion stability. When the mass fraction of modified graphene reaches 4%, the thermal conductivity of composite PCMs is 131.9% higher than that of pure n-octadecane.