Synthesis and thermal energy storage characteristics of polystyrene-graft-palmitic acid copolymers as solid–solid phase change materials
Synthesis and thermal energy storage characteristics of polystyrene-graft-palmitic acid copolymers as solid–solid phase change materials
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DOI：
10.1016/j.solmat.2011.07.003
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发表时间：
2011-12
影响因子：
6.9
通讯作者：
A. Sari;Cemil Alkan;A. Biçer;A. Karaipekli
中科院分区：
文献类型：
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作者：
A. Sari;Cemil Alkan;A. Biçer;A. Karaipekli
合成了一系列聚苯乙烯接枝棕榈酸（PA）共聚物作为新型聚合物固-固相变材料（PCM）。在固-固相变材料中，聚苯乙烯是骨架，PA是功能性侧链，在相变过程中储存和释放热量。共聚物的蓄热是由于共聚物中软链段PA的晶态和非晶态之间的相变，而硬链段聚苯乙烯即使在相变温度以上也限制了软链段分子链的自由运动。该共聚物在相变加工过程中始终保持固态，因此被称为形态稳定的 PCM。通过傅里叶变换红外光谱（FT-IR）和偏振光学显微镜（POM）分析来研究化学结构和晶体形态。通过差示扫描量热法（DSC）和热重分析（TGA）方法研究了相变材料的热储能性能、热可靠性和热稳定性。还使用热性能分析仪测量了 PCM 的热导率。分析结果表明，PA链成功接枝到聚苯乙烯主链上，共聚物表现出典型的固-固相变特性。此外，热循环测试表明，该共聚物经受5000次加热/冷却循环后仍具有良好的热可靠性和化学稳定性。合成的聚苯乙烯-接枝-PA共聚物作为新型固-固相变材料在地暖、温控纤维以及农业温室供暖和制冷等方面具有巨大的潜力。特别是，包含 75% PA 的聚苯乙烯-接枝-PA 共聚物是最具吸引力的 PCM，因为其在合成的共聚物 PCM 中具有最高的潜热存储能力。
A series of polystyrene graft palmitic acid (PA) copolymers as novel polymeric solid–solid phase change materials (PCMs) were synthesized. In solid–solid PCMs, polystyrene is the skeleton and PA is a functional side chain that stores and releases heat during its phase transition process. The heat storage of copolymers is due to phase transition between crystalline and amorphous states of the soft segment PA in copolymer and the hard segment polystyrene restricted the free movement of molecular chains of the soft segments even above the phase transition temperature. The copolymers always remain in the solid state during the phase transition processing and therefore they are described as form-stable PCM. Fourier transform infrared spectroscopy (FT-IR) and polarization optical microscopy (POM) analyses were performed to investigate the chemical structures and crystalline morphology. Thermal energy storage properties, thermal reliability and thermal stability of the PCMs were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) methods. Thermal conductivities of the PCMs were also measured using thermal property analyzer. The analysis results indicated that the PA chains were successfully grafted onto the polystyrene backbone and the copolymers showed typical solid–solid phase transition properties. Moreover, thermal cycling test showed that the copolymers have good thermal reliability and chemical stability although they were subjected to 5000heating/cooling cycling. The synthesized polystyrene-graft-PA copolymers as novel solid–solid PCMs have considerable potential for such as underfloor heating, thermo-regulated fibers and heating and cooling of agricultural greenhouses. Especially, the polystyrene-graft-PA copolymer including 75% PA is the most attractive PCM due to its highest latent heat storage capacity in the synthesized copolymer PCMs.