Preparation and characterization of side-chain liquid crystal polymer/paraffin composites as form-stable phase change materials
Preparation and characterization of side-chain liquid crystal polymer/paraffin composites as form-stable phase change materials
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DOI：
10.1039/c5ta00606f
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发表时间：
2015-04
影响因子：
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通讯作者：
Dang Wu;Bin Ni;Yujie Liu;Sheng Chen;Hailiang Zhang
中科院分区：
文献类型：
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作者：
Dang Wu;Bin Ni;Yujie Liu;Sheng Chen;Hailiang Zhang
合成了一系列侧链液晶聚合物（SCLCP），命名为聚[ω-（4′-n-烷氧基联苯-4-氧基）甲基丙烯酸己酯]（P6biCm，m = 1、2、4、6、8、10、12、14、16和18）。通过将P6biCm引入石蜡中制备了新型SCLCP/石蜡复合形态稳定相变材料（FSPCM）。通过“管测试法”测试了最低凝胶浓度（MGC）和凝胶-溶胶转变温度（TGS）特性。结果发现，P6biCm (m = 1, 2, 4, 6, 8, 10) 不溶于石蜡，而 P6biCm (m = 12, 14, 16, 18) 表现出低 MGC (≤6 wt%) 和高 TGS (P6biC12/石蜡的 TGS 为 140 °C)。通过 FT-IR、POM、1D WXAD 和 SEM 对 FSPCM 的结构和形貌进行了系统研究。实验结果表明，石蜡被限制在三维P6biCm网络中，使得FSPCM即使在其熔点以上也不会泄漏。通过DSC和TG研究了其热性能。研究表明，P6biCm/石蜡表现出优异的热稳定性和高储热密度。通过流变学测量评估形状稳定性，表明随着温度的升高观察到固体↔硬凝胶↔软凝胶↔液体。这项工作有助于理解形状稳定性的物理机制，同时为 FSPCM 的合成提供了一种新的方法。
A series of side-chain liquid crystal polymers (SCLCPs), named poly[ω-(4′-n-alkyloxybiphenyl-4-oxy) hexyl methacrylates] (P6biCm, m = 1, 2, 4, 6, 8, 10, 12, 14, 16 and 18), have been synthesized. Novel SCLCP/paraffin composite form-stable phase change materials (FSPCMs) were prepared by introducing P6biCm into paraffin. The minimum gelation concentration (MGC) and gel-to-sol transition temperature (TGS) properties were tested by a “tube-testing method”. It was found that P6biCm (m = 1, 2, 4, 6, 8, 10) were insoluble in paraffin, while P6biCm (m = 12, 14, 16, 18) exhibited a low MGC (≤6 wt%) and high TGS (TGS of P6biC12/paraffin is 140 °C). The structure and morphology of FSPCMs were systematically investigated by FT-IR, POM, 1D WXAD and SEM. The experimental results revealed that paraffin was restricted in the three-dimensional P6biCm network, leading to the FSPCM without leakage even above its melting point. The thermal properties were studied by DSC and TG. The research showed that the P6biCm/paraffin exhibited excellent thermal stability and high heat storage density. The shape stability was assessed by rheological measurements, indicating that solid ↔ hard gel ↔ soft gel ↔ liquid was observed with the increase of temperature. This work is useful in comprehending the physical mechanism of shape stability and in the meanwhile provides a novel method for synthesis of FSPCMs.