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Preparation and Characterization of Erythritol/Graphene Oxide Shape‐Stable Composites with Improved Thermal‐Physical Property
Author(s) -
Wang Yi,
Zhang Zhengfei,
Zhang Ting,
Qin Ziyi,
Zhang Deyi,
Ji Hui
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803178
Subject(s) - materials science , supercooling , carboxymethyl cellulose , composite material , graphene , thermal stability , thermal conductivity , nucleation , degree (music) , enthalpy , oxide , physical property , chemical engineering , thermodynamics , nanotechnology , sodium , physics , acoustics , engineering , metallurgy
In order to improve thermal‐physical properties of erythritol (ET), two kinds of shape‐stabilized phase change materials (SSPCMs) were fabricated and the effects of graphene oxide (GO), carboxymethyl cellulose (CMC) on supercooling degree and heat release performance of ET were discussed. The results revealed that the encapsulated ET displays excellent shape stability and slightly improved thermal‐physical performance, while the capsules containing 0.7 wt% CMC exhibit significant enhancement in thermal‐physical properties. The optimal composites, with ET content as high as 97 wt%, melt at 121.9 °C with latent heat of 316.8 J g −1 and freeze at 104.0 °C with enthalpy of 295.1 J g −1 . The heat release percentage increased to 93.2% and the supercooling degree decreased to 17.9 °C due to the heterogeneous nucleation of GO and the inhibition of CMC on components separation. Also, the two composites present similar core–shell‐like structure, excellent thermal reliability and stability during repeated utilization. In a word, GO can be used as shell to improve thermal conductivity and prevent leakage while CMC can be employed to relax the supercooling degree of ET.