膨胀石墨/硬脂酸复合相变材料的相变动力学*

doi:10.11901/1005.3093.2016.176

材料研究学报

2016, Vol. 30

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

本期目录 | 过刊浏览

膨胀石墨/硬脂酸复合相变材料的相变动力学*

李云涛,晏华(

),汪宏涛,王群

后勤工程学院化学与材料工程系重庆 401311

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

引用本文:

李云涛,晏华,汪宏涛,王群. 膨胀石墨/硬脂酸复合相变材料的相变动力学*[J]. 材料研究学报, 2016, 30(12): 921-930.
Yuntao LI, Hua YAN, Hongtao WANG, Qun WANG. Phase Transformation Kinetics of Phase Change Materials of Expanded Graphite/Stearic Acid Composite[J]. Chinese Journal of Materials Research, 2016, 30(12): 921-930.

全文: PDF(3548 KB) HTML

摘要:

以硬脂酸(SA)为相变材料, 以膨胀石墨(EG)为封装材料, 采用熔融共混法制备了硬脂酸/膨胀石墨复合相变材料(SA/EG-PCMs)。采用多重率DSC、SEM、FT-IR、TG等方法对SA/EG-PCMs的结构和性能进行表征, 应用非等温动力学数据处理模型进行了相变动力学研究。结果表明: EG具有大量网状结构的空洞(由10~50 μm厚的石墨片叠合而成的平行塌陷片层构成), 通过表面吸附和微孔束缚对硬脂酸进行有效封装, 使其颗粒粒径减小; 根据相变动力学分析, EG对SA分子链段的热扩散运动具有限制作用, 使SA/EG-PCMs的活化能均高于纯SA(E为535.55 kJ/mol), 热稳定性提高; 且随着EG含量的提高SA/EG-PCMs的活化能逐渐增大, 当EG含量(质量分数, 下同）高于10%时EG对SA分子链端的阻碍作用加剧, 使复合体系的相变温度和相变焓下降的幅度增大。

关键词 ：复合材料, 复合相变材料, 膨胀石墨, 硬脂酸, 相变动力学

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

收稿日期: 2016-04-05

基金资助:* 国家自然科学基金项目51272283资助

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.176 或 https://www.cjmr.org/CN/Y2016/V30/I12/921

图1 制备SA/EG-PCMs流程示意图

图2 相变材料反应过程的DSC曲线和峰形指数

图3 EG、SA/EG-PCMs的微观形貌

图4 SA、SA/EG-PCMs的红外光谱分析图

表1 不同EG含量的复合相变材料在不同升温速率(β)下初温(T0)、峰温(TP)、及终温(Tf)、相变温度(Tr)以及相变潜热H

图5 升温速率不同的SA、SA/EG-PCMs的DSC曲线

表2 SA/EG-PCMs的活化能值E和决定系数R2

图6 ln(β/TP2)与(1/TP)的关系曲线和活化能

表3 SA与EG的相互作用

图7 EG与SA相互作用的机理图

表4 不同升温速率下SA/EG-PCMs固-液相变的反应级数

图8 SA/EG-PCMs的热分析

图9 SA/EG-PCMs在冷热循环前后的红外光谱图

图10 硬脂酸结晶分子层

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