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1000 r/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137.6 J/g和132.8 J/g。TGA和 FIIR的分析表明,DA@PMMA微胶囊具有良好的性能。
The N-dodecanol-polymethyl-metharylate (DA@PMMA)microcapsules were prepared by suspension polymerization method with n-dodecanol (DA)as core material and polymethyl-metharylate (PMMA)as outer shell.Microcapsules were characterized by differential scanning calorimetry (DSC),scanning electron microscopy (SEM),transmission electron microscopy (TEM),fourier transform infrared spectroscopy (FTIR)and thermal gravimetric analysis (TGA),et al.The results show that the best conditions for preparation of DA@PMMA micro-capsules are:Sodium salt of styrene-maleic anhydride polymer (SMA)content is 7.5% to DA,2,2-azobisisobuty-ronitrile (AIBN)content is 7.5% to methyl methacrylate (MMA),the core/shell mass ratio is 2∶1 ,stirring speed is 1 000 r/min.DA@PMMA microcapsules are sphericalthe average particle size of DA@PMMA microcapsules is 26μm.The mass fraction of DA in DA@PMMA microcapsules is nearly 66% and the latent heats of melting and freezing are found to be 137.6 J/g and 132.8 J/g.TGA and FIIR analyses also indicate that DA@PMMA microcap-sules have good stability.
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