Thermo-optically responsive phase change materials for passive temperature regulation
Thermo-optically responsive phase change materials for passive temperature regulation
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DOI：
10.1016/j.solener.2019.12.064
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发表时间：
2020-02
期刊：
影响因子：
6.7
通讯作者：
Pramod Mishra;Kelli A. Stockmal;Giuseppe Ardito;Mingjiang Tao;S. Van Dessel;S. Granados-Fócil
中科院分区：
文献类型：
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作者：
Pramod Mishra;Kelli A. Stockmal;Giuseppe Ardito;Mingjiang Tao;S. Van Dessel;S. Granados-Fócil
许多相变材料（PCM）在经历相变时经历透明度的变化。这些热光响应材料可用于产生建筑外壳的被动温度控制系统。将光开关和热开关集成到智能温度控制元件中需要合理设计具有可调光学和热特性的PCM。合成了聚甲基丙烯酸十八酯（PSMA）和聚甲基丙烯酸2-（2-（十八烷氧基）乙氧基）乙酯（PE2SMA）两种聚合物，并对其在被动式热能储存系统中的潜在应用进行了评价。紫外-可见光谱，近红外光谱，和差示扫描量热法被用来评估在聚合物化学结构的变化对所得材料的光学和热性能的影响。在PSMA的侧链结晶基序和聚合物主链之间插入6个原子的柔性间隔物（二甘醇）导致潜热储存容量从62 J/g增加到94 J/g，热导率从0.218 W/mK增加到0.318 W/mK。值得注意的是，柔性间隔物的插入也导致熔融转变温度从PSMA的37.7 ° C增加到PE2SMA的48 ° C。聚合物的可见光透过率从0%增加到90%，从结晶到非晶态的转变。本研究提出了一种控制聚合物相变材料的热性能和光学性能的合成策略。从这项研究中得到的材料特性和结构-特性关系将使用于预测被动温度调节系统性能的模型得以改进。更精确的模型将指导开发更好地执行温度调节建筑外壳所需的热响应聚合物材料。
Many phase change materials (PCMs) experience a change in transparency when undergoing a phase transition. These thermo-optically responsive materials can be used to generate passive temperature control systems for building enclosures. The integration of optical and thermal switches into smart temperature-controlling elements requires rationally designed PCMs featuring tunable optical and thermal properties. Two polymers, poly (Octadecyl methacrylate) (PSMA) and poly(2-(2-(octadecyloxy) ethoxy) ethyl methacrylate) (PE2SMA) were synthesized and evaluated for their potential use in passive thermal energy storage systems. UV–Visible Spectroscopy, Near Infra-Red Spectroscopy, and Differential Scanning Calorimetry were used to evaluate the effect that changes in the polymer chemical structure had on the optical and thermal properties of the resulting materials. Insertion of a 6-atom flexible spacer (diethylene glycol) between the pendant crystalline motif and the polymer backbone of PSMA resulted in increases of latent heat storage capacity from 62 J/g to 94 J/g and thermal conductivity from 0.218 W/mK to 0.318 W/mK. Notably, insertion of a flexible spacer also resulted in a melting transition temperature increase from 37.7 °C for PSMA to 48 °C for PE2SMA. The visible transmittance of the polymers increased from 0% to 90% upon transition from crystalline to amorphous state. This study presents a synthetic strategy to control thermal and optical properties of polymeric PCMs materials. The material properties and structure-property relationships derived from this study will enable the refinement of the models used to predict the performance of passive temperature-regulating systems. More accurate models will guide the development of the thermo-responsive polymeric materials required for better perfoming temperature-regulating building enclosures.