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首页> 外文期刊>Energy Conversion & Management >Preparation and characterization of form-stable paraffin/polyurethane composites as phase change materials for thermal energy storage
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Preparation and characterization of form-stable paraffin/polyurethane composites as phase change materials for thermal energy storage

机译：形状稳定的石蜡/聚氨酯复合材料的制备和表征，作为热能存储的相变材料

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Polyurethane phase change material (PUPCM) has been demonstrated to be effective solid-solid phase change material for thermal energy storage. However, the high cost and complex process on preparation of PUPCMs with high enthalpy and broad phase transition temperature range can prohibit industrial-scale applications. In this work, a series of novel form-stable paraffin/PUPCMs composites (n-octade-cane/PUPCM, n-eicosane/PUPCM and paraffin wax/PUPCM) with high enthalpy and broad phase transition temperature range (20-65 ℃) were directly synthesized via bulk polymerization. The composites were prepared at different mass fractions of n-octadecane (10,20,25,30% w/w). The results indicated that the maximum encapsulation ratio for n-octadecane/PUPCM10000 composites was around 25% w/w. The chemical structure and crystalline properties of these composites were characterized by Fourier transform infrared spectroscopy (FT-IR), polarizing optical microscopy (POM), wide-angle X-ray diffraction (WAXD). Thermal properties and thermal reliability of the composites were determined using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). From DSC analysis, the composites showed a typical dual, phase change temperature. The enthalpy for the composite with 25% w/w n-eicosane was as high as 141.2 J/g. TGA analysis indicated that the composites degraded at considerably high temperatures. The process of preparation of PUPCMs and their composites was very simple, inexpensive, environmental friendly and easy to process into desired shapes, which could find the promising applications in solar energy storage and building.
机译：聚氨酯相变材料（PUPCM）已被证明是用于热能存储的有效固-固相变材料。然而，制备具有高焓和宽相变温度范围的PUPCM的高成本和复杂的工艺会阻碍工业规模的应用。在这项工作中，具有高焓和宽相变温度范围（20-65℃）的一系列新型形状稳定的石蜡/ PUPCMs复合材料（正十八烷/ PUPCM，正二十烷/ PUPCM和石蜡/ PUPCM）通过本体聚合直接合成。以正十八烷的不同质量分数（10、20、25、30％w / w）制备复合材料。结果表明，正十八烷/ PUPCM10000复合材料的最大包封率约为25％w / w。通过傅立叶变换红外光谱（FT-IR），偏振光学显微镜（POM），广角X射线衍射（WAXD）表征了这些复合材料的化学结构和晶体性能。使用差示扫描量热法（DSC）和热重分析（TGA）确定复合材料的热性能和热可靠性。通过DSC分析，该复合材料显示出典型的双重相变温度。具有25％w / w正二十烷的复合材料的焓高达141.2 J / g。 TGA分析表明该复合材料在相当高的温度下降解。 PUPCM及其复合材料的制备过程非常简单，廉价，环境友好并且易于加工成所需的形状，这可以在太阳能存储和建筑中找到有希望的应用。

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