Preparation and characterization of glyceryltristearate/DMDBS gel based form-stable phase change material

doi:10.12028/j.issn.2095-4239.2017.0007

Abstract

Abstract: A series of glyceryltristearate (GT)-1,3:2,4-di-(3,4-dimethyl) benzylidene sorbitol (DMDBS) composite phase change materials (PCMs) were prepared with the DMDBS as a gelator and GT as the PCM. Through examining the gel-sol temperature and the leakage of the PCM composites, we found that the composite PCM can be form-stable. A 3%(weight ratio) of DMDBS addition to the formulation gave a gel-sol transformation temperature of 159 ℃ and the resulted leakage was only 6%. Scanning electron microscopy (SEM) analyses were performed to observe the surface microstructure of the composites and the xerogel. The thermal properties were studied by Differential scanning calorimetry (DSC). The results indicated that the melting and freezing enthalpy of GT-3%DMDBS composite were 126.4 J/g and 105 J/g, respectively. A laser flash diffusivity apparatus was used to measure the thermal conductivity of samples. The driving force of the formation of the three-dimensional network structure due to DMDBS was studied by UV absorption spectrum and IR absorption spectrum. The effect of DMDBS addition on the molecular structure of GT was characterized by X-ray diffraction (XRD).

Key words: glyceryltristearate, DMDBS, form-stable, PCM

CHENG Xiaomin1,2, LI Ge1, HAN Jiaqiang1, YU Guoming2, LI Yuanyuan1, XU Jun1, XIANG Jiawei1. Preparation and characterization of glyceryltristearate/DMDBS gel based form-stable phase change material[J]. Energy Storage Science and Technology, 2017, 6(4): 681-687.

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