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首页> 外文期刊>Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion >Latent heat characteristics of biobased oleochemical carbonates as potential phase change materials
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Latent heat characteristics of biobased oleochemical carbonates as potential phase change materials

机译：作为潜在相变材料的生物基油脂化学碳酸盐的潜热特性

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Oleochemical carbonates are biobased materials that were readily prepared through a carbonate interchange reaction between renewable C10C18 fatty alcohols and dimethyl or diethyl carbonate in the presence of a catalyst. These carbonates have various commercial uses in cosmetic, fuel additive, and lubricant applications. Oleochemical carbonates have not been examined for their applicability as phase change materials (PCM). The latent heats of melting and freezing for a series of symmetrical oleochemical carbonates ranging from 21-37 carbon atoms were evaluated to develop a fundamental understanding of the solidliquid transitions for utilization in thermal energy storage (TES) applications. The phase transitions and associated thermal properties were determined by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Decyl, dodecyl, tetradecyl, hexadecyl, and octadecyl carbonates had peak melting and freezing points of -2.2, 19.3, 33.7, 44.9, and 51.6 and -6.3, 14.3, 28.7, 40.3, and 46.9 °C, respectively. In general, these carbonates exhibited sharp phase transitions and good latent heat properties. The latent heats of melting and freezing for decyl, dodecyl, tetradecyl, hexadecyl, and octadecyl carbonates were 144, 200, 227, 219, and 223 and 146, 199, 229, 215, and 215 J/g, respectively. These carbonates represent novel renewable-based PCM chemicals that compliment fatty acids, fatty alcohols, and their fatty acid esters while providing a potentially valuable biobased alternative to paraffin wax and salt hydrate PCM currently dominating the PCM market.
机译：油脂化学碳酸盐是生物基材料，可通过在催化剂存在下，可再生C10C18脂肪醇与碳酸二甲酯或碳酸二乙酯之间的碳酸盐交换反应轻松制备。这些碳酸盐在化妆品，燃料添加剂和润滑剂应用中具有多种商业用途。尚未检验油脂化学碳酸盐作为相变材料（PCM）的适用性。对一系列范围从21-37个碳原子的对称油脂化学碳酸盐进行熔融和冻结的潜热进行了评估，以建立对固液转变的基本理解，以用于热能存储（TES）应用。通过差示扫描量热法（DSC）和热重分析（TGA）确定相变和相关的热性能。碳酸癸基酯，十二烷基酯，十四烷基酯，十六烷基酯和十八烷基碳酸酯的峰值熔点和凝固点分别为-2.2、19.3、33.7、44.9和51.6和-6.3、14.3、28.7、40.3和46.9°C。通常，这些碳酸盐表现出尖锐的相变和良好的潜热性能。癸基，十二烷基，十四烷基，十六烷基和十八烷基碳酸酯的熔融和冷冻潜热分别为144、200、227、219和223和146、199、229、215和215 J / g。这些碳酸盐代表了新型的基于可再生的PCM化学物质，可补充脂肪酸，脂肪醇及其脂肪酸酯，同时为目前主导PCM市场的石蜡和盐水合物PCM提供潜在的有价值的生物基替代品。

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