十八酸对正十八烷微胶囊的过冷行为及性能的影响  

Effect of stearic acid on supercooling behavior and properties of n-octadecane microcapsules

作　　者：王建平 褚梦君[1,2] 张雅婷 王学晨 张兴祥[1,2] WANG Jian-ping;CHU Meng-jun;ZHANG Ya-ting;WANG Xue-chen;ZHANG Xing-xiang(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjin Key Laboratory of Advanced Fibers and Energy Storage,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学天津市先进纤维与储能技术重点实验室,天津300387

出　　处：《天津工业大学学报》2021年第1期1-5,共5页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(51573135)。

摘　　要：为了抑制正十八烷相变材料微胶囊的过冷行为,利用原位聚合法制备了添加十八酸的以正十八烷为芯材、氨基树脂为壁材的相变材料微胶囊,并利用傅里叶红外光谱仪(FTIR)、冷场扫描电镜(SEM)、差示扫描量热仪(DSC)、热重分析(TG)和X-射线衍射仪(XRD)等手段对微胶囊的结构、形貌、热性能及结晶性能等进行表征。结果表明:十八酸的添加使正十八烷微胶囊表面光洁度变差,过冷现象明显减弱;当十八酸的加入质量为芯材的4.2%时,过冷度从22.6℃降至10.0℃,异相成核结晶峰占比ΔHcα/ΔHc和包覆率分别达到75.2%和57.0%,且不影响微胶囊的耐热性能。这表明十八酸是正十八烷微胶囊较理想的过冷抑制剂。In order to suppress the supercooling behavior of microencapsulation n-octadecane,microcapsules were prepared by in-situ polymerization with n-octadecane as the core material in which stearic acid was added,and amino resin as the wall material.Fourier transform infrared spectrometer(FTIR),cold field scanning electron microscope(SEM),differential scanning calorimeter(DSC),thermogravimetric analysis(TG),and X-ray diffraction(XRD)were used to analyze the structure,the morphology,thermal properties,and crystallization properties of microcapsules.The results showed that the addition of octadecanoic acid made the surface smoothness of octadecane microcapsules worse,and the supercooling phenomenon weaken obviously.When the mass of octadecanoic acid was 4.2%of the core material,the supercooling degree decreased from 22.6℃to 10.0℃,and the ratio of heterogeneous nucleation peak,ΔHcα/ΔHc and the coating rate reached 75.2%and 57.0%,respectively,the heat resistance of microcapsules was not affected,which indicated that octadecanoic acid was an ideal supercooling inhibitor for octadecane microcapsules.

关 键 词：十八酸 正十八烷 相变材料微胶囊 过冷 

分 类 号：TB34[一般工业技术—材料科学与工程]