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首页> 外文期刊>Journal of Applied Polymer Science >The microencapsulation of calcium chloride hexahydrate as a phase-change material by using the hybrid coupler of organoalkoxysilanes
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The microencapsulation of calcium chloride hexahydrate as a phase-change material by using the hybrid coupler of organoalkoxysilanes

机译：通过使用有机烷氧基硅烷的杂合偶联剂将氯化钙六水合物作为相变材料的微胶囊

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摘要

A novel method of microencapsulation for inorganic salt hydrates as phase-change material (PCM), which is essential for their broad application, was pursued by combining sol-gel process with interfacial polymerization. Calcium chloride hexahydrate (CCH), chosen as a representative PCM of salt hydrates, was used as a core material, and organoalkoxysilane was applied to provide hybrid properties of mediating the hydrophilic core and hydrophobic shell material. The Fourier transform infrared spectra and SEM images confirmed that the siloxane and polyurea shell material successfully capsulated the CCH core. Fine morphology of microcapsules was further investigated with SEM, and it presented almost-spherical shape and a well-defined core-shell structure. Thermogravimetric analysis indicated that microcapsules containing CCH have sufficient thermal stability, which usually degraded in four steps. Differential scanning calorimeter investigation confirmed additionally that the microencapsulated CCH absorbs thermal energy with phase change during the melt process but undergo a severe super cooling phenomenon in the crystallizing process. In addition, the durability test was conducted to evaluate the siloxane polymer and polyurea as a shell material, protecting CCH from leaking. The effect of pH and the ratio of ingredients were studied in terms of encapsulation possibility and performance of core PCM, which include morphology of core-shell particles and essential thermal properties as a PCM. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45821.
机译：通过将溶胶 - 凝胶工艺与界面聚合组合，通过将溶胶 - 凝胶法与界面聚合组合来追求作为相变材料（PCM）作为相变材料（PCM）的微型涂料的微胶囊化合物。选择作为盐水合物的代表性PCM的氯化钙六水合物（CCH）用作芯材料，并施加有机烷氧基硅烷以提供介导亲水芯和疏水壳材料的杂化性能。傅里叶变换红外光谱和SEM图像证实了硅氧烷和聚脲壳材料成功地填充了CCH芯。进一步用SEM研究微胶囊的细形态，并呈现几乎是球形的形状和明确定义的芯壳结构。热重分析表明，含CCH的微胶囊具有足够的热稳定性，其通常以四个步骤降解。差分扫描量热计研究另外证实，微胶囊化CCH在熔体过程中吸收热能，在熔体过程中具有相变，但在结晶过程中经历严重的超级冷却现象。此外，进行耐久性测试以评估硅氧烷聚合物和聚脲作为壳体材料，保护CCH免受泄漏。在封装的可能性和核心PCM的性能方面研究了pH的影响和成分的比例，包括核 - 壳颗粒的形态和作为PCM的必需热性能。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45821。

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