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    卢铁梅, 朱紫璇, 胡湖, 杨睿. 聚丙烯酸钠/十水合硫酸钠复合相变材料[J]. 功能高分子学报, 2020, 33(2): 157-164. doi: 10.14133/j.cnki.1008-9357.20190301002
    引用本文: 卢铁梅, 朱紫璇, 胡湖, 杨睿. 聚丙烯酸钠/十水合硫酸钠复合相变材料[J]. 功能高分子学报, 2020, 33(2): 157-164. doi: 10.14133/j.cnki.1008-9357.20190301002
    LU Tiemei, ZHU Zixuan, HU Hu, YANG Rui. Sodium Polyacrylate/Sodium Sulfate Decahydrate Phase Change Composites[J]. Journal of Functional Polymers, 2020, 33(2): 157-164. doi: 10.14133/j.cnki.1008-9357.20190301002
    Citation: LU Tiemei, ZHU Zixuan, HU Hu, YANG Rui. Sodium Polyacrylate/Sodium Sulfate Decahydrate Phase Change Composites[J]. Journal of Functional Polymers, 2020, 33(2): 157-164. doi: 10.14133/j.cnki.1008-9357.20190301002

    聚丙烯酸钠/十水合硫酸钠复合相变材料

    Sodium Polyacrylate/Sodium Sulfate Decahydrate Phase Change Composites

    • 摘要: 以聚丙烯酸钠(PAA)为基体,通过吸收熔融的十水合硫酸钠(Na2SO4·10H2O),制备了PAA/Na2SO4·10H2O复合相变材料。通过差示扫描量热分析、热重分析、偏光显微镜及扫描电子显微镜,对复合相变材料的形貌结构、相变行为、热稳定性及循环稳定性进行了研究。结果表明:PAA水凝胶的三维网络结构能够有效地抑制Na2SO4·10H2O的相分离,形成均匀稳定的复合相变材料;复合相变材料具有较高的潜热及热稳定性,45次冷热循环证明了其良好的稳定性;加入Na2SO4·10H2O 质量5%的硼砂可显著改善复合相变材料的过冷现象,其过冷度降低至1.0 ℃;复合相变材料在Na2SO4·10H2O加热熔融时不发生泄漏。

       

      Abstract: Na2SO4·10H2O is a promising phase change material for energy saving buildings. In order to suppress the phase segregation and diminish the super-cooling degree of Na2SO4·10H2O, PAA/Na2SO4·10H2O phase change composites were prepared through absorbing the molten sodium sulfate decahydrate (Na2SO4·10H2O) into the sodium polyacrylate (PAA) matrix. The polymerization condition of PAA was optimized to obtain maximal absorption of Na2SO4·10H2O. The optimal condition was: N, N-methylenebisacrylamide (Bis, as crosslinking agent) mass fraction of 0.02%, ammonium persulfate (APS, as initiator) mass fraction of 0.1%, neutralization degree of 75%, acrylic acid (AA, as monomer) mass fraction of 30%, polymerization temperature of 70 °C, and reaction time of 3 h. The morphology and microstructure, phase changing behavior, thermal stability and thermal cycling stability of the phase change composites were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TG), polarized optical microscope (POM) and scanning electron microscope (SEM). Results showed that the absorption amount of Na2SO4·10H2O in the PAA matrix could be as much as 93%. The three-dimensional network structure effectively inhibited the phase segregation of Na2SO4·10H2O and formed stable phase change composites. Moreover, the phase change composites had high latent heat, exhibiting good thermal stability and cycling stability, and the phase change temperature and enthalpy maintained nearly unchanged after 45 heating-cooling cycles. The supercooling degree of PAA/ Na2SO4·10H2O was further decreased by adding borax. When m(Borax): m(Na2SO4·10H2O)=5%, the supercooling degree of the phase change composites could be decreased to 1.0 °C. Furthermore, no leakage was observed during the heating procedure even when Na2SO4·10H2O was melted.

       

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