Li Weiping, Mei Dajiang, Wang Jihu, Wu Hui, Wen Shaoguo
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Polymers (Basel). 2023 May 25;15(11):2441. doi: 10.3390/polym15112441.
Microencapsulated phase change materials (MCPCM) as a green energy storage material not only prevent leakage of phase change materials but also increase the heat transfer area of phase change materials. Extensive previous work has shown that the performance of MCPCM depends on the shell material and MCPCM with polymers, as the shell material suffers from low mechanical strength and low thermal conductivity. In this study, a novel MCPCM with hybrid shells of melamine-urea-formaldehyde (MUF) and sulfonated graphene (SG) was prepared by in situ polymerization using SG-stabilized Pickering emulsion as a template. The effects of SG content and core/shell ratio on the morphology, thermal properties, leak-proof properties, and mechanical strength of the MCPCM were investigated. The results showed that the incorporation of SG into the shell of MUF effectively improved the contact angles, leak-proof performance, and mechanical strength of the MCPCM. Specifically, the contact angles of MCPCM-3SG were reduced by 26°, the leakage rate was reduced by 80.7%, and the breakage rate after high-speed centrifugation was reduced by 63.6% compared to MCPCM without SG. These findings suggest that the MCPCM with MUF/SG hybrid shells prepared in this study has great potential for application in thermal energy storage and management systems.
微胶囊相变材料（MCPCM）作为一种绿色储能材料，不仅能防止相变材料泄漏，还能增加相变材料的传热面积。以往大量研究表明，MCPCM的性能取决于壳材，而以聚合物为壳材的MCPCM存在机械强度低和热导率低的问题。本研究以磺化石墨烯（SG）稳定的Pickering乳液为模板，通过原位聚合法制备了一种具有三聚氰胺 - 尿素 - 甲醛（MUF）和磺化石墨烯（SG）混合壳层的新型MCPCM。研究了SG含量和核壳比对MCPCM的形貌、热性能、防漏性能和机械强度的影响。结果表明，将SG引入MUF壳层有效地改善了MCPCM的接触角、防漏性能和机械强度。具体而言，与不含SG的MCPCM相比，MCPCM - 3SG的接触角降低了26°，泄漏率降低了80.7%，高速离心后的破损率降低了63.6%。这些研究结果表明，本研究制备的具有MUF/SG混合壳层的MCPCM在热能存储和管理系统中具有巨大的应用潜力。
