Phase Transformation Kinetics of Phase Change Materials of Expanded Graphite/Stearic Acid Composite

doi:10.11901/1005.3093.2016.176

Chinese Journal of Materials Research

2016, Vol. 30

Issue (12): 921-930 DOI: 10.11901/1005.3093.2016.176

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Phase Transformation Kinetics of Phase Change Materials of Expanded Graphite/Stearic Acid Composite

Yuntao LI,Hua YAN(

),Hongtao WANG,Qun WANG

Department of Chemistry and Material Engineering, Logistic Engineering University, Chongqing 401311, China

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Yuntao LI,Hua YAN,Hongtao WANG,Qun WANG. Phase Transformation Kinetics of Phase Change Materials of Expanded Graphite/Stearic Acid Composite. Chinese Journal of Materials Research, 2016, 30(12): 921-930.

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Abstract

Phase change materials of expanded graphite/stearic acid composite (SA/EG-PCMs) were prepared by melt-blending method with stearic acid (SA) as phase change material and expanded graphite (EG) as packing material. The structure and property of SA/EG-PCMs were characterized by SEM, FT-IR, TG and the DSC of multi rate, and their phase transformation kinetics was studied by the model of data processing of non-isothermal kinetics. The results show that there exist a lot of holes with network structures within EG, which were composed of parallel and collapsed laminas of stacked thinner graphite of 10~50 μm, with which SA was packaged thereby, the resulted particle size of SA/EG-PCMs was decreased. According to the analysis of the phase transformation kinetics, EG might play certain role in hindering the thermal migration of the molecular chains of DA; the activation energy of SA/EG-PCMs was higher than that of the pure SA (E is 535.55 kJ/mol), indicating the higher thermal stability of the former; With the increasing EG content, the activation energy of SA/EG-PCMs increased gradually, as the EG content over 10%, the blocking effect of SA/EG-PCMs on the migration of molecular chain of SA increased much more obviously, and which enable the dissension of the phase transition temperature and phase change enthalpy to be enlarged.

Key words: composite composite phase change materials expanded graphite stearic acid phase transformation kinetics

Received: 05 April 2016

Fund: *Supported by National Natural Science Foundation of China No. 51272283.

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	Yuntao LI
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https://www.cjmr.org/EN/10.11901/1005.3093.2016.176 OR https://www.cjmr.org/EN/Y2016/V30/I12/921

Fig.1 Preparation process diagram of SA/EG-PCMs

Fig.2 The DSC curve of the phase change process (A) and DSC curve of peak index (B)

Fig.3 SEM images of EG (a), S1 (b), S2 (c), S3 (d), S4 (e), S5 (f)

Fig.4 FT-IR spectra of SA and SA/EG-PCMs

Tabel 1 T₀, T_P, T_f, H of SA/EG-PCMs with different mass fraction of EG in different heating rate β

Fig.5 DSC curves of SA and SA/EG-PCMs in different heating rates (a) 0%, (b) 5%, (c) 10%, (d) 15%, (e) 20%, (f) the variation of T_r, T_P, T_f, H

Table 2 Values of E and R² of SA/EG-PCMs with different mass fraction of EG

Fig.6 Plot ln(β/T_P²) versus 1/T_p (a) and activation energy (b)

Table 3 Interactions between SA and EG

Fig.7 Schematic of the interaction of SA with EG

Table 4 Reaction order of SA/EG-PCMs in the solid-liquid change under different heating rates

Fig.8 Thermal analysis of SA/EG-PCMs, (a) TGA curve, (b) DTG curve, (c) DSC curve

Fig.9 FT-IR spectra of SA/EG-PCMs in hot and cold cycles, (a) S2, (b) S3, (c) S4, (d) S5

Fig.10 Molecular layer of stearic acid insolid

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