Preparation and characterizations of HDPE-EVA alloy/OMT nanocomposites/paraffin compounds as a shape stabilized phase change thermal energy storage material

被引:67
作者
Cai, Yibing
Hu, Yuan [1 ]
Song, Lei
Lu, Hongdian
Chen, Zuyao
Fan, Weicheng
机构
[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230027, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Chem, Hefei 230026, Anhui, Peoples R China
基金
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词
phase change nanocomposites materials (PCNM); organophilic montmorillonite (OMT); thermal stability; latent heat; flame retardant mechanism;
D O I
10.1016/j.tca.2006.08.015
中图分类号
O414.1 [热力学];
学科分类号
摘要
A kind of shape stabilized phase change nanocomposites materials (PCNM) based on high density polyethylene (HDPE)/ethylene-vinyl acetate (EVA) alloy, organophilic montmorillonite (OMT), paraffin and intumescent flame retardant (IFR) are prepared using twin-screw extruder technique. The structures of the HDPE-EVA alloy/OMT nanocomposites are evidenced by the X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that an ordered intercalated nanomorphology of the HDPE-EVA alloy/OMT nanocomposites is formed. Then the structures of the shape stabilized PCNM are characterized by scanning electron microscopy (SEM). The HDPE-EVA alloy/OMT nanocomposites act as the supporting material and form the three-dimensional network structure. The paraffin acts as a phase change material and disperses in the three-dimensional network structure. Its latent heat is given by differential scanning calorimeter (DSC) method. The SEM and DSC results show that the additives of IFR have little effect on the network structure and the latent heat of shape stabilized PCNM, respectively. The thermal stability properties are characterized by thennogravimetric analysis (TGA). The TGA analysis results indicate that the flame retardant shape stabilized PCNM produce a larger amount of char residue at 800 degrees C than that of shape stabilized PCNM, although the onset of weight loss of the flame retardant shape stabilized PCNM occur at a lower temperature. The formed multicellular char residue contributes to the improvement of thermal stability performance. The probable combustion mechanisms are also discussed in this paper. (C) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:44 / 51
页数:8
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