Abstract: The cellulose sponges(Cell) was prepared with the microcrystalline cellulose(MCC) as raw material. Based on the homemade cellulose sponges, polyethylene glycol/cellulose phase change materials(PCMs) were prepared by physical blending method with polyethylene glycol(PEG) PEG-6000 as phase change material. The structure and phase transition properties of PCMs were studied. Experimental results showed that the mass fraction of PEG in PCMs could reach 90.77% without liquid leakage during phase change process. FT-IR results showed that there was obvious hydrogen bonding in cellulose sponges between cellulose substrates and PEG-6000 and there was no new compound. XRD analysis results showed that, compared with pure PEG-6000, the addition of cellulose substrates didn't change the crystalline form of PEG, but decreased the crystallinity of PEG in PCMs. DSC analysis results showed that the melting enthalpy(ΔH_f) of PCMs increased with the increase of PEG mass fraction, the value of which could reach 146.88J/g(PCM₅), and was less than that of pure PEG(179.09J/g). But the crystallization enthalpy(ΔH_c) of PCMs reduced with the increase of PEG mass fraction, the absolute value of which could reach 137.81J/g. At last, TG analysis showed that the prepared PCMs had good thermal stability below 250℃.

Key words: cellulose sponge, eneray storage materials, polyethylene glycol