材料科学
结晶
聚乙二醇
聚合物
化学工程
共价键
PEG比率
异氰酸酯
热能储存
复合材料
有机化学
聚氨酯
化学
经济
工程类
生物
生态学
财务
作者
Weibo Kong,Yunyun Yang,Anqian Yuan,Liang Jiang,Xiaowei Fu,Yuechuan Wang,Hualiang Xu,Zhimeng Liu,Jingxin Lei
出处
期刊:Energy
[Elsevier]
日期:2021-10-01
卷期号:232: 121070-121070
被引量:33
标识
DOI:10.1016/j.energy.2021.121070
摘要
Generally, the chemically crosslinking solid-solid phase change materials (PCMs) are fabricated to address the issues of leakage and poor mechanical properties of traditional PCMs. However, the solid-solid PCMs also bring environmental pollution and resources waste as the permanent chemically crosslinking polymers cannot be recycled and reprocessed once molded. Herein, we reported a dynamic-covalent- crosslinking PCMs (V-PCMs) consisting of polyethylene glycol (PEG) as phase change ingredient, polyaryl polymethylene isocyanate (PAPI) as crosslinking points and disulfide as dynamic bonds. The as-prepared V-PCMs can reversibly store and release heat via melting and crystallization of PEG chains, and exhibit anti-leakage performance and solid-solid phase change merit due to chemically crosslinking networks even above melting point (Tm) of PEG. Besides, the V-PCMs show recycling and reprocessing ability from association mechanism of dynamic disulfide bonds. Also, the recycled V-PCMs can reversibly store and release heat and exhibit solid-solid phase change characteristic as original V-PCMs. This method provides a promising way for the fabrication of chemically crosslinking solid-solid PCMs with recyclability and multi-functionalization.
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