石蜡/硅藻土定型相变材料的结构和热性能

doi:10.11901/1005.3093.2016.640

材料研究学报

2017, Vol. 31

Issue (7): 502-510 DOI: 10.11901/1005.3093.2016.640

研究论文

本期目录 | 过刊浏览

石蜡/硅藻土定型相变材料的结构和热性能

赵思勰, 晏华(

), 李云涛, 汪宏涛, 胡志德

后勤工程学院化学与材料工程系重庆 401311

Structure and Thermal Performances of Paraffin/Diatomite Form-stable Phase Change Materials

Sixie ZHAO, Hua YAN(

), Yuntao LI, Hongtao WANG, Zhide HU

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

引用本文:

赵思勰, 晏华, 李云涛, 汪宏涛, 胡志德. 石蜡/硅藻土定型相变材料的结构和热性能[J]. 材料研究学报, 2017, 31(7): 502-510.
Sixie ZHAO, Hua YAN, Yuntao LI, Hongtao WANG, Zhide HU. Structure and Thermal Performances of Paraffin/Diatomite Form-stable Phase Change Materials[J]. Chinese Journal of Materials Research, 2017, 31(7): 502-510.

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摘要:

以硅藻土为载体、以石蜡为相变材料,用溶剂蒸发法制备出石蜡/硅藻土定型相变材料(PA/D-PCMs),使用SEM、FT-IR、TGA、DSC等手段对其微观结构和热性能进行了表征。结果表明：硅藻土对石蜡的毛细管力及两者之间形成的氢键能阻碍液态石蜡的渗出,使PA/D-PCMs具有很高的热稳定性,硅藻土的二级孔洞限制了部分石蜡的结晶。硅藻土内部有许多互相连通的导热通道,增强了石蜡的导热效果并提高了蓄放热速率。随着石蜡含量的增大PA/D-PCMs的X、Y和Z轴传热通道上声子的散射作用更剧烈,使其导热系数降低,但是具有更高的结晶度和相变潜热。为了保证PA/D-PCMs的结构稳定和良好的热性能,石蜡的最佳质量分数为45%。

关键词 ：材料学, 硅藻土, 石蜡/硅藻土定型相变材料, 微观结构, 结晶度, 热性能

Abstract：

The paraffin/diatomite form-stable phase change materials(PA/D-PCMs) was prepared by using solvent evaporation, diatomite as carrier and paraffin as phase change materials. The microstructure and thermal properties of PA/D-PCMs were characterized by SEM、FT-IR、DSC and TGA respectively. The results show that: Leakage of melting paraffin was hindered through both the hydrogen bonding and the capillary force of the pores of diatomite, hence PA/D-PCMs put up excellent thermal stability. At the same time, secondary pores of diatomite can restrict partial paraffin crystallization, crystallinity of which would be affected. In interior of diatomite there were a few conduction channels with intercommunication, which can enhance thermal conductivity of paraffin and accelerate paraffin heat storage and release. With increase of the paraffin content phonon scattering effect would become more fierce in X, Y and Z axis thermal conduction channel of PA/D-PCMs, so thermal conductivity of PA/D-PCMs diminish, but owning higher latent heat and crystallinity. In order to ensure PA/D-PCMs structure stable and have good thermal properties simultaneously, optimal paraffin fraction in the composite is 45%.

Key words： material science diatomite paraffin/diatomite form-stable phase change materials microstructure crystallinity thermal properties

收稿日期: 2016-11-25

ZTFLH:

TQ314

基金资助:资助项目国家自然科学基金(51272283)

作者简介:

作者简介赵思勰,男,1994年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.640 或 https://www.cjmr.org/CN/Y2017/V31/I7/502

图1 熔融凝固曲线测量示意图

图2 导热系数测定示意图和探头结构示意图

图3 DI-CA和D3的接触角

图4 DI-CP、DI-CA和PA/D-PCMs扫描电镜图片

图5 PA、DI和PA/D-PCMs的红外光谱图

图6 20℃样品的外观形貌和经热渗出实验样品的外观形貌

图7 PA、PA/DI-PCMs失重率和失重速率曲线

图8 PA/D-PCMs的DSC曲线

Code	$T onset$ /℃	$T peak$ /℃	$T end$ /℃	$Δ H D$ /Jg^-1	$Δ H T$ /Jg^-1	Crystallinity/%
PA	50.5	61.5	66.5	212.9	212.9	-
D1	50.1	60.5	65.0	63.6	74.2	85.71
D2	50.0	60.1	64.8	75.8	85.1	89.07
D3	49.8	59.5	64.5	91.5	95.5	95.81
D4	50.3	59.4	64.3	96.8	104.3	92.76

表1 PA、PA/D-PCMs的相变温度和相变潜热

图9 D1、 D3和PA的熔融凝固曲线

图10 PA和PA/D-PCMs的导热系数

图11 PA/D-PCMs导热机制的示意图

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