MA/SBR/CNT定型复合相变材料的制备及其性能研究

Preparation of MA/SBR/CNT shape⁃stabilized composite phase change materials and study on their properties

以肉豆蔻酸(MA)为储能基元材料、丁苯橡胶(SBR)为储能载体、碳纳米管(CNT)为导热增强材料,通过熔融共混法制备了MA/SBR/CNT低温复合定型相变材料。采用SEM、FT-IR、XRD、DSC等测试表征手段对复合相变材料的微观结构、物化稳定性和热性能进行了分析。结果表明,SBR能很好地包裹MA,维持复合材料结构稳定且保证液相材料相变过程中不发生泄漏。CNT的加入可以有效地提高复合相变材料的热导率,当添加质量分数为7%的CNT时,复合相变材料热导率可达到0.4 W/(m·K),其导热性能大大提高;在该添加比例下,复合材料熔化、凝固相变温度分别为53.03℃、51.49℃,相变焓变分别为156.53 kJ/kg、152.35 kJ/kg。

MA/SBR/CNT,a shape⁃stabilized composite phase change material,is prepared through melt blending method with myristic acid as energy storage element material,styrene butadiene rubber(SBR)as energy storage carrier,and carbon nanotubes as thermal conductive reinforcement material.The structure,morphology,physical and chemical stabilities,and thermal properties of the phase change material are analyzed by means of SEM,FT⁃IR,XRD,and DSC.Result shows that SBR can wrap myristic acid well,which maintains the stability of composite material structure and ensures there is no leakage during the phase transition process of liquid⁃phase materials.The addition of carbon nanotubes can effectively improve the thermal conductivity of composite phase change materials.Thermal conductivity of composite phase change materials reaches 0.4 W/(m·K)as the mass loading of carbon nanotubes is 7 wt.%.Under such a composition,the melting temperature and freezing phase change temperature of the composite materials are 53.03℃and 51.49℃,and phase change enthalpies are 156.53 kJ·kg^(-1) and 152.35 kJ·kg^(-1),respectively.