Abstract This paper deals with the synthesis, characterization, thermal properties and thermal reliability of 1-tetradecanol and 1-octadecanol-succinic acid esters as a novel solid–liquid phase change materials (PCM) for thermal energy storage (TES). Ditetradecyl succinate (DTS) and dioctadecyl succinate (DOS) were synthesized by using succinic acid and excessive amount of fatty alcohol under vacuum and without catalyst. The esterification reaction yield was found above 95%. High purity ester compounds were characterized structurally by 1 H nuclear magnetic resonance ( 1 HNMR) and fourier transform infrared (FT-IR) spectroscopy techniques as thermophysical properties were investigated using a differential scanning calorimeter (DSC) and a thermogravimetric analyzer (TGA). DSC method was exploited for determination of phase change temperature, enthalpy, total enthalpy and specific heat (Cp) of DTS and DOS. Thermophysical properties of the produced esters were similar to fatty alcohols. Phase change temperatures and enthalpies were slightly lower than those of pristine fatty alcohols which were explained by the succinate distortion replaced by hydrogen bonding interactions. The DSC analyses pointed out that the phase change temperatures of TDS for heating period were between 47 °C and 46 °C as corresponding enthalpy for cooling period was between 202.4 and 197.5 Jg-1 respectively. The phase change temperature and enthalpy of DOS were between 64 °C and 63 °C and 194.9 and 191.7 Jg-1 respectively. In addition, the thermal cycling test including 1000 accelerated cyclings was conducted to determine the thermal reliability of the synthesized PCMs and structural and thermal consistency of the material were checked by post FT-IR and DSC analysis. Morphology and thermal endurance limits of the DTS and DOS were also investigated using POM and TGA respectively. Based on the results, it was concluded that the synthesized novel PCMs had considerable potential due to their satisfactory thermal properties, thermal reliability and stability.

中文翻译：

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琥珀酸二十四烷基酯和琥珀酸二十八烷基酯作为新型热能储存相变材料的合成与表征

摘要 本文研究了 1-十四醇和 1-十八醇琥珀酸酯作为一种用于热能储存 (TES) 的新型固液相变材料 (PCM) 的合成、表征、热性能和热可靠性。以琥珀酸和过量脂肪醇为原料，在真空、无催化剂的条件下合成了琥珀酸二十四烷基酯（DTS）和琥珀酸二十八烷基酯（DOS）。发现酯化反应产率在 95% 以上。高纯度酯化合物通过 1 H 核磁共振 ( 1 HNMR) 和傅立叶变换红外 (FT-IR) 光谱技术进行结构表征，同时使用差示扫描量热仪 (DSC) 和热重分析仪 (TGA) 研究热物理性质。利用DSC法测定相变温度，DTS 和 DOS 的焓、总焓和比热 (Cp)。产生的酯的热物理性质类似于脂肪醇。相变温度和焓略低于原始脂肪醇的相变温度和焓，这是由氢键相互作用取代的琥珀酸变形所解释的。DSC分析表明，TDS在加热阶段的相变温度在47°C和46°C之间，冷却阶段相应的焓分别在202.4和197.5 Jg-1之间。DOS的相变温度和焓分别在64°C和63°C之间以及194.9和191.7 Jg-1之间。此外，进行了包括 1000 次加速循环的热循环测试，以确定合成的 PCM 的热可靠性，并通过后 FT-IR 和 DSC 分析检查材料的结构和热一致性。还分别使用 POM 和 TGA 研究了 DTS 和 DOS 的形态和耐热极限。结果表明，合成的新型 PCM 具有令人满意的热性能、热可靠性和稳定性，因此具有相当大的潜力。