以正硅酸四乙酯(TEOS)、3-(异丁烯酰氧)丙基三甲氧基硅烷(MPS)和甲基三乙氧基硅烷(MTES)为有机硅烷前驱体,通过溶胶-凝胶法制备了一系列有机硅包覆硬脂酸十二烷基酯(DS)相变微胶囊,考查了有机硅烷前驱体的组成、芯/壁投料质量比对微胶囊性能的影响,通过扫描电镜(SEM)、红外光谱(FT-IR)、X射线衍射(XRD)、差式扫描量热仪(DSC)和热重分析仪(TG)等对微胶囊性能进行了表征。结果表明,所制备的微胶囊由DS和有机硅壁材组成,粒径大小介于50～100nm;当TEOS/MTES质量比为95∶5、芯/壁投料比为1∶1时,微胶囊的包封效率最高可达35.45%;有机硅壁材能够有效阻止芯材融化后的泄露,同时提升相变微胶囊的热稳定性能;经过100次热循环后,相变微胶囊的熔融焓保持在94%以上,显示出良好的相变稳定性和可重复性。
A series of organosilicon-coated dodecyl stearate (DS) phase change microcapsules were prepared through the sol-gel method using tetraethyl orthosilicate (TEOS),3-methacryloxypropyltrimethoxysilane (MPS),and methyltriethoxysilane (MTES) as the organic silane precursors.The influence of the composition of the organic silane precursors and core/shell mass ratio on the microcapsule properties was investigated.The properties of the microcapsules were characterized by scanning electron microscopy (SEM),Fourier-transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD),differential scanning calorimetry (DSC),and thermogravimetric analysis (TGA).The results showed that the prepared microcapsules were composed of DS and organosilicon shell,with particle sizes ranging from 50 to 100nm.When the TEOS/MTES mass ratio was 95∶5 and the core/shell ratio was 1∶1,the highest encapsulation efficiency of the microcapsules could reach a maximum of 35.45%.The organosilicon shell effectively prevented the leakage of the core material after melting,while enhancing the thermal stability of the phase change microcapsules.After 100 thermal cycles,the melting enthalpy of the microcapsules remained above 94%,demonstrating good phase change stability and repeatability.
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基金资助
江汉大学校级科研项目(2021yb023)
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