期刊
MATERIALS LETTERS
卷 234, 期 -, 页码 17-20出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.09.040
关键词
Polyethylene glycol; Expanded vermiculite; Energy storage and conversion; Phase transformation; Thermal properties; Non-isothermal crystallization kinetics
资金
- National Natural Science Foundation of China (NSFC) [U1607113]
- Program of Qinghai Science and Technology Department [2017-HZ-805]
- Fundamental Research Funds for the Central Universities [53200859163]
- National Infrastructure of Mineral, Rock and Fossil Specimen Resources [2005DKA21405]
In this work, non-isothermal crystallization behavior of polyethylene glycol (PEG)/expanded vermiculite (EVM) form-stable composite phase change material (PEG-EVM) was investigated. The activation energy of non-isothermal crystallization of PEG-EVM (-219.7 kJ/mol) was lower than that of PEG (-375.3 kJ/mol), indicating that the energy barrier of heterogeneous nucleation decreased, demonstrating that the EVM significantly accelerated the nucleation of PEG. However, the crystallization kinetic parameters (half-crystallization time, crystallization rate and required cooling rate for a designated relative crystallinity) revealed that the non-isothermal crystalline growth of PEG in PEG-EVM was constrained because the surface interactions of EVM hindered the migration and diffusion of PEG molecular chains to the surface of nucleus. (C) 2018 Elsevier B.V. All rights reserved.
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