Preparation, thermal and flammability properties of a novel form-stable phase change materials based on high density polyethylene/poly(ethylene-co-vinyl acetate)/organophilic montmorillonite nanocomposites/paraffin compounds
Preparation, thermal and flammability properties of a novel form-stable phase change materials based on high density polyethylene/poly(ethylene-co-vinyl acetate)/organophilic montmorillonite nanocomposites/paraffin compounds
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DOI：
10.1016/j.enconman.2008.02.013
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发表时间：
2008-08
影响因子：
10.4
通讯作者：
Yibing Cai;Lei Song;Qingliang He;Dandan Yang;Yuan Hu
中科院分区：
文献类型：
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作者：
Yibing Cai;Lei Song;Qingliang He;Dandan Yang;Yuan Hu
石蜡是重要的储热材料之一，具有高熔化热、变化的相变温度、可忽略的过冷、自成核、无相偏析、廉价等特点，但热稳定性差且易燃。因此，通过双螺杆挤出机技术制备了一种基于高密度聚乙烯（HDPE）/乙烯-醋酸乙烯酯（EVA）/有机蒙脱石（OMT）纳米复合材料和石蜡的新型形状稳定的相变材料（PCM）。 X 射线衍射 (XRD)、透射电子显微镜 (TEM) 和扫描电子显微镜 (SEM) 证明了 HDPE-EVA/OMT 纳米复合材料和形状稳定的 PCM 的结构。 XRD和TEM结果表明HDPE-EVA/OMT纳米复合材料形成有序插层纳米形态。形状稳定的 PCM 由作为分散相变材料的石蜡和作为支撑材料的 HDPE-EVA/OMT 纳米复合材料组成。石蜡分散在 HDPE-EVA/OMT 纳米复合材料形成的三维网状结构中。分别通过热重分析（TGA）、动态傅立叶变换红外（FTIR）、差示扫描量热计（DSC）和锥形量热计表征其热稳定性、潜热性和可燃性。 TGA 和动态 FTIR 分析表明，在形状稳定的 PCM 中加入适量的 OMT 可以提高热稳定性。 DSC结果表明，形状稳定的PCM的潜热有一定程度的降低。锥形量热仪显示，随着形状稳定的 PCM 中添加 OMT，热释放率 (HRR) 显着降低，有助于改善可燃性。
The paraffin is one of important thermal energy storage materials with many desirable characteristics (i.e., high heat of fusion, varied phase change temperature, negligible supercooling, self-nucleating, no phase segregation and cheap, etc.), but has low thermal stability and flammable. Hence, a novel form-stable phase change materials (PCM) based on high density polyethylene (HDPE)/poly(ethylene-co-vinyl acetate) (EVA)/organophilic montmorillonite (OMT) nanocomposites and paraffin are prepared by twin-screw extruder technique. The structures of the HDPE–EVA/OMT nanocomposites and the form-stable PCM are evidenced by the X-ray diffraction (XRD), transmission electronic microscopy (TEM) and scanning electronic microscope (SEM). The results of XRD and TEM show that the HDPE–EVA/OMT nanocomposites form the ordered intercalated nanomorphology. The form-stable PCM consists of the paraffin, which acts as a dispersed phase change material and the HDPE–EVA/OMT nanocomposites, which acts as the supporting material. The paraffin disperses in the three-dimensional net structure formed by HDPE–EVA/OMT nanocomposites. The thermal stability, latent heat and flammability properties are characterized by thermogravimetry analysis (TGA), dynamic Fourier-transform infrared (FTIR), differential scanning calorimeter (DSC) and cone calorimeter, respectively. The TGA and dynamic FTIR analyses indicate that the incorporation of suitable amount of OMT into the form-stable PCM increase the thermal stability. The DSC results show that the latent heat of the form-stable PCM has a certain degree decrease. The cone calorimeter shows that the heat release rate (HRR) has remarkably decreases with loading of OMT in the form-stable PCM, contributing to the improved flammability properties.