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以相变物质正十二醇(DA)为芯材,聚甲基丙烯酸甲酯(PMMA)为壁材,采用悬浮聚合法制备了正十二醇-聚甲基丙烯酸甲酯(DA@PMMA)微胶囊。通过差示扫描量热仪(DSC),扫描电镜(SEM),透射电镜(TEM),傅里叶变换红外光谱仪(FIIR)和热重分析仪(TGA)等仪器对微胶囊进行检测表征。结果表明:当工艺为苯乙烯-马来酸甘钠盐(SMA)加入量占DA质量的7.5%,偶氮二异丁腈(AIBN)加入量占单体甲基丙烯酸甲酯(MMA)质量的7.5%,芯材壁材质量比为2∶1,搅拌速度为1 000r/min时,所制备的微胶囊整体性能最好。DA@PMMA微胶囊为球形,平均粒径26μm,DA@PMMA微胶囊中DA的质量分数为66%。DA@PMMA微胶囊的熔化焓和结晶焓分别是137.6J/g和132.8J/g。TGA和FIIR的分析表明,DA@PMMA微胶囊具有良好的性能。
The phase change material n-dodecyl alcohol (DA) as core material and polymethylmethacrylate (PMMA) as wall material were used to prepare n-dodecyl alcohol-polymethylmethacrylate (DA @ PMMA) Microcapsules. The microcapsules were characterized by DSC, SEM, TEM, FIIR and TGA. The results showed that the addition of AIBN to the monomer MMA when the amount of SMA was 7.5% of DA, 7.5%, the mass ratio of core material to wall material is 2:1, and the best microcapsule performance is obtained when stirring speed is 1 000r / min. The DA @ PMMA microcapsules were spherical with an average particle size of 26μm. The mass fraction of DA in DA @ PMMA microcapsules was 66%. The melting enthalpy and crystallization enthalpy of DA @ PMMA microcapsules were 137.6 J / g and 132.8 J / g, respectively. Analysis of TGA and FIIR showed that DA @ PMMA microcapsules have good properties.