采用高温炼制法,以苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)及多层石墨烯(MLG)为支撑材料,对石蜡(PW)进行封装,制备了SBS／MLG／PW三元复合定型相变材料(SSPCMs)。利用扫描电子显微镜、傅里叶红外光谱、差式扫描量热和热失重等手段来表征定型相变材料的微观结构及热物性。结果表明:定型相变材料各组分之间属于物理混合;石蜡含量为89%的样品综合性能最优,滴点高达176.3℃,钢网分油率低至0%,相变焓值为157.7J/g,表现出良好的热稳定性、胶体稳定性及储能性能;经过50次相变循环后,定型相变材料的储能性能仍然保持稳定,循环使用性能良好;在100℃的高温环境下仍能保持稳定的形状,显著减小了石蜡渗漏率;定型相变材料的热导率较纯石蜡提高了20.51%。
Using styrene-butadiene-styrene block copolymer (SBS) and multilayer graphene (MLG) as supporting materials,the SBS/MLG/PW ternary composite formalized phase change materials (SSPCMs) were prepared by high temperature refining.Scanning electron microscopy (SEM),fourier infrared spectroscopy (FT-IR),differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) were used to characterize the microstructure and thermophysical properties of the PCM.The results shown that between the components of PCM was belong to physical mixing.The sample containing 89% paraffin wax had the best comprehensive properties,the drop point was as high as 176.3℃,the oil separation rate of the steel mesh was as low as 0%,and the enthalpy of phase transformation was 157.7J/g,showing good thermal stability,colloidal stability and energy storage performance.After 50 phase change cycles,the energy storage performance of the finalized PCM remained stable,and the recycling performance was good.Under the high temperature environment of 100℃,it still kept stable shape and significantly reduced the leakage rate of paraffin wax.The thermal conductivity of the finalized PCM was increased by 20.51% compared with that of pure paraffin wax.
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基金资助
国家自然科学基金面上项目(20973022和11472048)
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