Preparation and properties studies of halogen-free flame retardant form-stable phase change materials based on paraffin/high density polyethylene composites
Preparation and properties studies of halogen-free flame retardant form-stable phase change materials based on paraffin/high density polyethylene composites
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DOI：
10.1016/j.apenergy.2007.10.017
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发表时间：
2008-08-01
期刊：
影响因子：
11.2
通讯作者：
Gao, Weidong
中科院分区：
文献类型：
--
作者：
Cai, Yibing;Wei, Qufu;Gao, Weidong
采用双螺杆挤出机技术制备了基于石蜡/高密度聚乙烯（HDPE）复合材料的无卤阻燃定形相变材料（PCM）。采用扫描电镜（SEM）、热重分析（TGA）、动态傅里叶变换红外光谱（FTIR）、差示扫描量热仪（DSC）和锥形量热仪（Cone Calorimeter）等测试手段，对膨胀型阻燃剂与可膨胀石墨（EG）及不同协同添加剂聚磷酸铵（APP）、硼酸锌（ZB）的复合相变材料的结构和性能进行了表征。TGA结果表明，无卤阻燃形式稳定的PCM复合材料在700 ° C下产生大量的烧焦残留物，尽管由于阻燃剂的热分解，无卤阻燃形式稳定的PCM复合材料的重量损失的开始发生在较低的温度下。DSC测试结果表明，阻燃剂的添加对复合材料的储热性能影响不大，相变峰温度和相变潜热在冷冻过程中更易出现。动态FTIR监测结果表明，随着热氧化温度的升高，主链（HDPE和石蜡）的断裂和各种残留物的形成增加。锥形量热仪测试也发现，热释放速率（PHRR）的峰值显着下降。燃烧后PHRR的降低和烧焦残渣的结构表明，EG和APP之间存在协同效应，有助于改善无卤阻燃型稳定PCM复合材料的燃烧性能。(c)2008爱思唯尔有限公司保留所有权利。
The halogen-free flame retardant form-stable phase change materials (PCM) based on paraffin/high density polyethylene (HDPE) composites were prepared by using twin-screw extruder technique. The structures and properties of the form-stable PCM composites based on intumescent flame retardant system with expandable graphite (EG) and different synergistic additives, such as ammonium polyphosphate (APP) and zinc borate (ZB) were characterized by scanning electronic microscope (SEM), thermogravimetric analyses (TGA), dynamic Fourier-transform infrared (FTIR) spectra, differential scanning calorimeter (DSC) and Cone calorimeter test. The TGA results showed that the halogen-free flame retardant form-stable PCM composites produced a larger amount of charred residue at 700 degrees C, although the onset of weight loss of the halogen-free flame retardant form-stable PCM composites occurred at a lower temperature due to the thermal decomposition of flame retardant. The DSC measurements indicated that the additives of flame retardant had little effect on the thermal energy storage property, and the temperatures of phase change peaks and the latent heat of the paraffin showed better occurrence during the freezing process. The dynamic FTIR monitoring results revealed that the breakdowns of main chains (HDPE and paraffin) and formations of various residues increased with increasing thermo-oxidation temperature. It was also found from the Cone calorimeter tests that the peak of heat release rate (PHRR) decreased significantly. Both the decrease of the PHRR and the structure of charred residue after combustion indicated that there was a synergistic effect between the EG and APP, contributing to the improved flammability of the halogen-free flame retardant form-stable PCM composites. (c) 2008 Elsevier Ltd. All rights reserved.