Engineering of W-VO2@polydopamine modified polyurethane solid-solid phase change materials towards smart thermal fabrics
Tungsten-doped vanadium dioxide@poly(dopamine)modified polyurethane solid-solid phase change materials(W-VO2@PDA/PUPCM)were prepared from in situ polymerization of soft segment polyethylene glycol(PEG)and hard segment isophorone diisocyanate(IPDI)with polydopamine-coated tungsten-doped vanadium dioxide(W-VO2@PDA)as filler.The effects of PEG relative molecular mass(molecular mass for short)on the stability of W-VO2@PDA/PUPCM emulsions and the temperature regulation of its finished fabrics were investigated.The chemical structure,crystallization properties,phase change properties and thermal stability of W-VO2@PDA/PUPCM were characterized and analyzed by FTIR,TEM,POM,XRD,DSC and TG.The results showed that the PEG molecular mass had a significant influence on the thermal storage and phase change properties of W-VO2@PDA/PUPCM.W-VO2@PDA/PUPCM prepared from PEG with molecular mass of 8000 exhibited good shape and thermal stability,with the highest melting temperature and phase change enthalpy of 51.52℃and 144.82 J/g,respectively.The maximum temperature difference during the heating and cooling process between fabric finished with W-VO2@PDA/PUPCM and no finishing was 7.8 and 5.3℃,respectively.
solid-solid phase change materialspolyurethanetungsten-doped vanadium dioxidephase change temperature regulationfabricsfunctional materials