Structures and Cooling Effects of Poly(lactic acid)/Poly(ethylene glycol)Phase Change Materials
Aiming at the problem of poor cooling effect of poly(lactic acid)(PLA)in the heat-not-burn cigarette,the PLA was modified by blending with poly(ethylene glycol)(PEG)that had high enthalpy of phase transformation.PLA/PEG phase change materials with different molecular weights and contents of PEG were prepared by melt extrusion.The phase change behaviors,mechanical properties,hydrophilicity,cooling effect and structural changes before and after phase changes for the materials were systematically investigated.The results show that compared with the pure PLA material,the incorporation of PEG enhances the latent heat of phase transition at 40-70℃and widens the temperature range of phase change of the materials.The mechanical properties and hydrophilicity of PLA/PEG material are significantly affected by the mass fraction of PEG,but almost not affected by the molecular weight of PEG.With the increase of the PEG mass fraction,the yield strength and Young's modulus of PLA/PEG material decrease,while the elongation at break and hydrophilicity increase.PLA/PEG material was 3D-printed into the cooling filter by the fusion deposition molding.When the PLA/PEG cooling filter is applied to the heat-not-burn cigarette,it shows a good cooling effect,which is attributed to the melting endotherm of PEG and the enthalpy relaxation of PLA in the glass transition region.
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