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    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

    Sodium Polyacrylate/Sodium Sulfate Decahydrate Phase Change Composites

    • 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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