Synthesis and thermal properties of poly(styrene-co-ally alcohol)-graft-stearic acid copolymers as novel solid–solid PCMs for thermal energy storage
Synthesis and thermal properties of poly(styrene-co-ally alcohol)-graft-stearic acid copolymers as novel solid–solid PCMs for thermal energy storage
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DOI：
10.1016/j.solener.2012.04.018
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发表时间：
2012-09
期刊：
影响因子：
6.7
通讯作者：
A. Sari;Cemil Alkan;Ö. Lafçı
中科院分区：
文献类型：
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作者：
A. Sari;Cemil Alkan;Ö. Lafçı
合成了一系列聚（苯乙烯-烯丙醇）-接枝-硬脂酸共聚物作为新型聚合物固-固相变材料（SSPCM）。通过傅里叶变换红外（FT-IR）和质子核磁共振（1H NMR）光谱技术验证了苯乙烯-烯丙醇共聚物与硬脂酰氯之间的接枝共聚反应。使用偏光光学显微镜（POM）技术研究了 SSPCM 的晶体形态。使用差示扫描量热法 (DSC) 分析测量合成的 SSPCM 的热能存储特性。 POM 结果表明，在相变温度以上，共聚物的结晶相转变为非晶相。通过差示扫描量热法（DSC）研究了合成的SSPCM的热能储存性能，发现它们具有27-30°C范围内的典型固-固相变温度和34-74J/g之间的高潜热焓。特别是摩尔比为1/1（苯乙烯-烯丙醇共聚/硬脂酰氯）的共聚物由于其中潜热存储能力最高而最有吸引力。 DSC和FT-IR分析结果表明，合成的SSPCM在5000次热循环后具有良好的热可靠性和化学稳定性。热重（TG）分析结果表明合成的SSPCM具有较高的耐热性。此外，热导率测量表明，与聚（苯乙烯-烯丙醇）相比，合成的 PCM 具有更高的热导率。合成的共聚物作为新型 SSPCM，在热能储存应用方面具有巨大的潜力，例如建筑物和温室中的太阳能空间加热和冷却。
A series of poly(styrene-co-allyalcohol)-graft-stearic acid copolymers were synthesized as novel polymeric solid–solid phase change materials (SSPCMs). The graft copolymerization reactions between poly(styrene-co-allyalcohol) and stearoyl chloride were verified by Fourier transform infrared (FT-IR) and Proton Nuclear Magnetic Resonance (1H NMR) spectroscopy techniques. The crystal morphology of the SSPCMs was investigated using polarized optical microscopy (POM) technique. Thermal energy storage properties of the synthesized SSPCMs were measured using differential scanning calorimetry (DSC) analysis. The POM results showed that the crystalline phase of the copolymers transformed to amorphous phase above their phase transition temperatures. Thermal energy storage properties of the synthesized SSPCMs were investigated by differential scanning calorimetry (DSC) and found that they had typical solid–solid phase transition temperatures in the range of 27–30°C and high latent heat enthalpy between 34 and 74J/g. Especially, the copolymer with the mole ratio of 1/1 (poly(styrene-co-allyalcohol)/stearoyl chloride) is the most attractive one due to the highest latent heat storage capacity among them. The results of DSC and FT-IR analysis indicated that the synthesized SSPCMs had good thermal reliability and chemical stability after 5000 thermal cycles. Thermogravimetric (TG) analysis results suggested that the synthesized SSPCMs had high thermal resistance. In addition, thermal conductivity measurements signified that the synthesized PCMs had higher thermal conductivity compared to that of poly(styrene-co-allyalcohol). The synthesized copolymers as novel SSPCMs have considerable potential for thermal energy storage applications such as solar space heating and cooling in buildings and greenhouses.