以石蜡(PA)为相变材料,苯乙烯-乙烯/丁烯-苯乙烯三嵌段共聚物(SEBS)为支撑材料,通过溶液共混高速剪切的方法制备了SEBS/PA混合物,在混合物中分别引入氮化硼(BN)和膨胀石墨(EG)作为导热添加剂,制备了2种定形复合相变材料SEBS/PA/BN和SEBS/PA/EG。通过扫描电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪分析了复合材料的微观形貌和结构,并通过差示扫描量热仪、热重分析仪以及热常数分析仪对复合材料的相变性能及导热性能进行研究。结果表明,EG对复合材料内部热传导率的促进作用明显优于BN;EG质量分数为20%时,SEBS/PA/EG复合材料的导热系数最高,达到0.92W/(m·K),比纯PA提高了约441.2%,熔融焓达到152J/g。
Using paraffin (PA) as the phase change material and styrene-ethylene/butylene-styrene triblock copolymer (SEBS) as the support material,a SEBS/PA mixture was prepared by solution blending and high-speed shear mixing.In addition,two thermally conductive additives,expanded graphite (EG) and boron nitride (BN),were introduced to obtain two types of composite form-stable phase change materials (FSPCMs):SEBS/PA/BN and SEBS/PA/EG.The microscopic morphology and structure of the composites were analyzed by scanning electron microscopy (SEM),X-ray diffraction (XRD) and Fourier transform infrared (FT-IR),and the phase transition properties and thermal conductivity of the composites were thoroughly investigated by differential scanning calorimetry (DSC),thermogravimetry (TG) and thermal constant analyzer.The results showed that EG promoted the internal thermal conductivity of the composites significantly better than BN.SEBS/PA/EG with 20wt% EG content exhibited the highest thermal conductivity of 0.92W/(m·K),which was about 441.2% higher than that of pure PA,with a melting enthalpy of 152J/g.
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基金资助
国家自然科学基金(51673154);国家自然科学基金(52273254);中央高校基本科研业务费专项资金资助(2023-vb-001)
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