CAJ | 학술논문

用界面聚合法,合成了直径大约 2.5 μ m可用于热能储存含相变材料的聚脲包覆微胶囊.在含乳化剂的水溶液中,将溶有芯材正十六烷的有机相乳化成微米级油性液滴,随后加入的水溶性单体二胺与甲苯 2, 4-二异氰酸酯在胶束界面相互反应形成囊壁.分别用乙烯二胺, 1, 6-己二胺和它们的混合物作为水溶性单体进行了研究.并用红外光谱和热分析分别考察了不同胺类对微胶囊化学结构和热性质的影响.红外谱图显示合成了聚脲微胶囊,热重曲线表明含正十六烷的聚脲微胶囊能够耐受大约 300 ℃高温,差示扫描量热测试表明所有样品均具有合适的相转变热,冷热循环实验揭示微胶囊能够维持储热容量不衰减.研究表明微胶囊化的正十六烷作为相变储热材料具有良好的应用前景.
용계면취합법,합성료직경대약 2.5 μ m가용우열능저존함상변재료적취뇨포복미효낭.재함유화제적수용액중,장용유심재정십륙완적유궤상유화성미미급유성액적,수후가입적수용성단체이알여갑분 2, 4-이이청산지재효속계면상호반응형성낭벽.분별용을희이알, 1, 6-기이알화타문적혼합물작위수용성단체진행료연구.병용홍외광보화열분석분별고찰료불동알류대미효낭화학결구화열성질적영향.홍외보도현시합성료취뇨미효낭,열중곡선표명함정십륙완적취뇨미효낭능구내수대약 300 ℃고온,차시소묘량열측시표명소유양품균구유합괄적상전변열,랭열순배실험게시미효낭능구유지저열용량불쇠감.연구표명미효낭화적정십륙완작위상변저열재료구유량호적응용전경.
For thermal energy storage application,polyurea microcapsules about 2.5 μ m in diameter containing phase change material were prepared using interfacial polycondensation method.In the system droplets in microns are first formed by emulsifying an organic phase consisting of a core material (n- hexadecane) and an oil- soluble reactive monomer,toluene- 2,4- diisocyanate (TDI),in an aqueous phase.By adding water- soluble reactive monomer,diamine,monomers TDI and diamine react with each other at the interface of micelles to become a shell.Ethylenediamine (EDA),1,6- hexane diamine (HAD) and their mixture were employed as water- soluble reactive monomers.The effects of diamine type on chemical structure and thermal properties of the microcapsules were investigated by FT- IR and thermal analysis respectively.The infrared spectra indicate that polyurea microcapsules have been successfully synthesized;all the TG thermographs show microcapsules containing n- hexadecane can sustain high temperature about 300 ℃ without broken and the DSC measurements display that all samples possess a moderate heat of phase transition; thermal cyclic tests show that the encapsulated paraffin kept its energy storage capacity even after 50 cycles of operation.The results obtained from experiments show that the encapsulated n- hexadecane possesses a good potential as a thermal energy storage material.