Preparation and Properties of Poly(Lactic Acid)Flexible Shaped Phase Change Films
To solve the problems of easy leakage and poor mechanical properties of phase change materials,this paper prepared PEG/PLA phase change films with poly(lactic acid)(PLA)as the substrate and poly(ethylene glycol)(PEG)as the phase change agent.The thermal and mechanical properties were tested,and the results showed that PLA as a supporting substrate effectively pre-vented the leakage of PEG liquid.the highest relative enthalpy efficiency of 103.87％was achieved at the PEG/PLA ratio of 180/100,and the latent heats of melting and solidification were 128.5 J·g-1 and 120.2 J·g-1,respectively.with the increase of PEG ratio,the film Young's modulus gradually decreased with the increase of PEG ratio,and the Young's modulus was 152.2 MPa at the PEG/PLA ratio of 180/100,which was 73.2％lower than that of pure PLA,and the flexibility of the film was improved.
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