论文部分内容阅读
采用界面聚合的方法,以甲苯-2,4-二异氰酸酯(TDI)和乙二胺(EDA)为反应单体,非离子表面活性剂聚乙二醇壬基苯基醚(OP)为乳化剂,合成了正二十烷为相变材料的聚脲包覆微胶囊.结果表明,二异氰酸酯和乙二胺按质量比1.9∶1进行反应.以透射电镜和激光粒度分析仪分析微胶囊,测得空心微胶囊直径约为0.2μm,含正二十烷微胶囊约为2-6μm.红外光谱分析证明,壁材料聚脲是由TDI及EDA两种单体形成的.正二十烷的包裹效率约为75%.微胶囊的熔点接近囊芯二十烷的熔点,而其储热量在壁材固定时随囊芯的量而变.热重分析表明,囊芯正二十烷、含正二十烷的微胶囊以及壁材料聚脲,能够耐受的温度分别约为130℃、170℃及270℃.
Using interfacial polymerization method, toluene-2,4-diisocyanate (TDI) and ethylenediamine (EDA) as the reaction monomer, nonionic surfactant polyethylene glycol nonylphenyl ether (OP) as emulsifier , The polye urea-coated microcapsules with n-eicosane as phase-change material were synthesized.The results showed that the reaction of diisocyanate and ethylenediamine was carried out at a mass ratio of 1.9:1.The microcapsules were analyzed by transmission electron microscopy and laser particle size analyzer Hollow microcapsules with a diameter of about 0.2μm, containing n-eicosane microcapsules is about 2-6μm. Infrared spectroscopy proved that the wall material polyurea is formed by TDI and EDA two monomers. The efficiency is about 75% .The microcapsule melting point is close to the melting point of the capsule core eicosane, and its heat storage in the wall material fixed with the amount of the capsule core change.CTR analysis shows that the capsule core is eicosane containing positive Eicosane microcapsules as well as wall material polyurea were able to withstand temperatures of about 130 ° C, 170 ° C and 270 ° C, respectively.