HCPs基/棕榈酸复合相变材料的制备及其储热性能  

Preparation and Thermal Storage Properties of HCPs/Palmitic Acid Composite Phase Change Materials

作　　者：刘志红 吴唯 张雪薇 LIU Zhihong;WU Wei;ZHANG Xuewei(Sino-German Joint Research Center of Advanced Materials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工工大学材料科学与工程学院,中德先进材料联合研究中心,上海200237

出　　处：《华东理工大学学报（自然科学版）》2020年第3期360-367,共8页Journal of East China University of Science and Technology

摘　　要：以回收聚苯乙烯泡沫塑料(PS)为原料,三氯化铝为催化剂,通过Scholl偶联法合成了超交联微孔聚合物(HCfoams),然后以HCfoams为载体,采用真空浸渍法吸附棕榈酸(PA)得到定形复合相变材料PA@HCfoams。通过氮气吸附脱附曲线得到HCfoams比表面积和孔径分布,采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、热重分析仪(TG)和差示扫描量热仪(DSC)对PA@HCfoams的形貌、结构、热性能进行表征。结果表明:HCfoams具有丰富的孔体积(1.25 cm^3/g),合适的孔径(5.68 nm)和较大的比表面积(1 078 m^2/g);PA通过物理结合成功吸附到HCfoams的孔隙中;复合相变材料表现出较高的负载率和潜热,PA@HCfoam2负载率可达77.53%(质量分数),熔融和结晶潜热值分别为148.50、141.62 J/g;通过100次冷-热循环后负载率损失仅为1.42%,展现出良好的热循环效果。Foam-based hyper-crosslinked polymers(HCfoams)were synthesized by Scholl coupling method using recycled polystyrene foams as the raw materials and aluminium chloride(AlCl3)as the catalyst.HCfoams exhibit high specific surface area,permanent porosity and well thermal stability.Shape-stabilized phase change materials(PCMs)composites were obtained by sorption of palmitic acid(PA)into the channel of HCfoams via vacuum impregnation.The specific surface area and pore size distribution of HCfoams were characterized by a nitrogen adsorption/desorption isotherm.The morphology,structure,thermal stability and latent heat of PA@HCfoams were characterized by scanning electron microscopy(SEM),X-ray diffractometer(XRD),Fourier transform infraredspectrometer(FT-IR),thermogravimetricanalysis(TG)and differential scanning calorimeter(DSC),respectively.The results show that HCfoam2 has a rich pore volume(1.25 cm3/g),suitable pore size(5.68 nm)and a large specific surface area(1078 m2/g).PA was successfully adsorbed into the pores of HCfoams by physical binding.The composites have favorable encapsulation rate and phase enthalpies.For palmitic acid@HCfoam2(PA@HCfoam2),its encapsulation rate reaches up to 77.53%,and the latent heat values of melting and freezing were 148.50 J/g and 141.62 J/g,respectively,with the corresponding temperature of 66.9℃and 56.2℃,respectively.PA@HCfoam2 showed excellent thermal reliability,with a load decreased by only 1.42%after 100 times cycling.In addition,compared with PA,the thermal conductivity of PA@HCfoam2 increased by 12.59%.All these results that the materials have broad prospects in thermal energy storage applications.

关 键 词：相变材料 超交联微孔聚合物 棕榈酸 真空浸渍法 

分 类 号：TB34[一般工业技术—材料科学与工程]