Preparation of phase change microcapsules with high thermal storage and temperature sensitive for thermal management. (1st August 2023)

• Record Type: Journal Article
• Authors: Yan, Bin; Lu, Honglang; Li, Min; Wang, Xiaoyu; Wang, Zhisen; Pi, Menghan; Cui, Wei; Ran, Rong
• Is Part Of: Journal of energy storage. Volume 64(2023)
• Publication Date: 2023-08-01
• Subjects: Pickering emulsion -- Phase change material -- N-eicosane -- Polyurea; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2023.107003
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Preparing microcapsules with core-shell structure by encapsulating phase change materials (PCM) in the shell is considered as an effective method to solve the leakage problem of PCM during use. Herein, a phase change microcapsule (MPCM) based on n-eicosane core and polyurea shell was prepared. This MPCM was prepared by interfacial polymerization of isophorone diisocyanate (IPDI) and ethylenediamine (EDA) using Pickering emulsion as a template and sulfonated lignin (SL) derived from industrial by-products as an emulsifier. The morphology, chemical structure and optimal preparation conditions of the MPCM were investigated by polarized light microscopy, fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results showed that the SL emulsified n-eicosane oil-in-water emulsion particles had good dispersion and homogeneous particle size. MPCM-2 with combined optimal conditions in MPCM exhibited regular spherical shape, high enthalpy of phase change (209.8 J/g), high encapsulation ratio (82.9 %), good thermal cycling stability, and negligible leakage rate. When PDMS and MPCM-2 were compounded and applied to thermal management, the MPCM-2/PDMS composite exhibited a much slower temperature rise and fall. Moreover, a plateau period appears at the crystallization and melting temperatures. Moreover, the phase change energy storage of MPCM/PDMS could be easily observed by the change of color after the introduction of temperature-sensitive particles. In summary, the present MPCM has good thermal storage and thermal management capabilities and provides a good application prospect for thermal energy storage systems. Highlights: The MPCM had well-defined core-shell structure and high thermal stability. The most suitable ratio of n-eicosane core and PUA shell for the MPCM was determined. The enthalpy of MPCM was 209.8 J/g, and the encapsulation rate was as high as 82.9 %. The MPCM had significant thermal management and temperature response capabilities.