Silicone rubber/paraffin@silicon dioxide form-stable phase change materials with thermal energy storage and enhanced mechanical property
Silicone rubber/paraffin@silicon dioxide form-stable phase change materials with thermal energy storage and enhanced mechanical property
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硅橡胶/石蜡@二氧化硅形状稳定的相变材料，具有热能储存和增强的机械性能
DOI：
10.1016/j.solmat.2019.03.034
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发表时间：
2019-07-01
影响因子：
6.9
通讯作者：
Fan, Jinghui
中科院分区：
文献类型：
--
作者：
Guo, Yongli;Yang, Wenbin;Fan, Jinghui
研制了一种硅橡胶(SR)/石蜡(PA)@二氧化硅(SiO_2)复合稳定相变材料。以正硅酸乙酯(TEOS)和γ-氨丙基三乙氧基硅烷(APTES)为前驱体，以PA为相变材料芯材，将PA@SiO_2微胶囊包覆在SiO_2壳层中，然后将PA@SiO_2微胶囊包埋在SR基质中，制备SR/PA@SiO_2复合材料。SiO_2壳层可以为熔融的PA提供屏障，同时作为无机填料对SR具有增强作用。利用APTES对SiO_2壳层进行原位改性，不仅可以防止团聚，而且可以增强PA@SiO_2与SR之间的界面结合。通过差示扫描量热仪(DSC)和力学性能测试对形态稳定的相变材料的热性能和力学性能进行了表征。结果表明，SR/PA@SiO_2复合材料的热性能和力学性能均优于SR/PA和SR/PA/SiO_2复合材料。通过将所制备的复合材料加热到PA的熔融温度来进行泄漏测试。结果表明，SR/PA@SiO_2复合材料是一种形态稳定的低泄漏率的相变材料。SR/PA@SiO_2复合材料的相变潜热可达92.39J·g~(-1)，可用于储能。
A kind of silicone rubber (SR)/paraffin (Pa)@silicon dioxide (SiO2) composite form-stable phase change material (PCM) was developed in this paper. Pa@SiO2 was obtained by choosing Pa as PCM core microencapsulated in SiO2 shell based on tetraethoxysilane (TEOS) and gamma-aminopropyl triethoxysilane (APTES) as precursors, then Pa@SiO2 microencapsules were embedded in SR matrix to fabricate SR/Pa@SiO2 composites. The SiO2 shell can provide a barrier for the melted Pa and meanwhile have reinforcing effect on SR as inorganic filler. The in-situ modification of SiO2 shell using APTES owing to the amino groups can not only prevent agglomeration, but also increase interfacial bonding between Pa@SiO2 with SR. The thermal and mechanical properties of the form stable PCMs were characterized by differential scanning calorimetry (DSC) and mechanical tests. The results showed that the thermal and mechanical properties of SR/Pa@SiO2 composites were better than those of SR/Pa and SR/Pa/SiO2. Leakage test was conducted by heating the prepared composites over the melting temperature of Pa. The SR/Pa@SiO2 composites were found as form-stable PCM with low leakage rate. The phase change latent heat of the SR/Pa@SiO2 composites was up to 92.39 J g(-1) and the composites can be used for thermal energy storage.