A two-step method was employed to prepare n-OD@SiO2/SRm composite phase change microcapsules with high energy storage density by using n-octadecane (n-OD) as the core,SiO2 as the inner wall material,and silicone rubber microspheres (SRm) as the outer wall material.FT-IR,XRD,SEM,TGA and DSC were used to characterize the chemical structure composition,crystal diffraction peak,microstructure,thermal stability and latent heat properties of the composite phase change microcapsules,and the effects of capsule wall mass ratio and monomer type on their properties were investigated.The results showed that the initial decomposition temperature of n-OD/SiO2 phase change microcapsules was higher than that of n-OD,and the introduction of SRm improved the thermal stability of the composite phase change microcapsules.The melting enthalpy and solidification enthalpy of n-OD/SiO2 phase change microcapsules were 135.5J/g and 141.8J/g,respectively.The maximum melting enthalpy and solidification enthalpy of composite phase change microcapsules could reach 112.2J/g and 112.8J/g,respectively.After 30 cycles,the melting enthalpy and solidification enthalpy of the composite phase change microcapsules did not change significantly,demonstrating excellent recyclability.
Liu Yifan, Lin Xing, Wang Bodong, Huang Xiaoling, Liu Le, Yang Wentong, Jiang Yan, Zhang Hongwen
. Preparation and characterization of n-octadecane energy storage composites[J]. New Chemical Materials, 2024
, 52(6)
: 98
-102
.
DOI: 10.19817/j.cnki.issn1006-3536.2024.06.015
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