Thermal Storage Properties of Poly(ethylene glycol)@Poly(vinyl alcohol)Coaxial Phase Change Fibers
PEG 4000 with high phase change enthalpy was used as core layer PCM,PVA as shell layer support material,and green solvent water as solvent for the shell and core layer materials,and the core-shell phase change fibers with different core layer spinning solution concentrations and feed rates were prepared by coaxial electrostatic spinning.SEM and TEM photographs show that at a PEG concentration of 45％and an inlet rate of 0.06 mL/h,PEG@PVA has a good morphology and high content of PEG,and the core-shell partitioning interface of the phase change fibers is obvious.FT-IR spectra show that the chemical compatibility between PEG and PVA is good.The results of DSC and TG display that the melting temperature of PEG@PVA is 62.81 ℃,the melting enthalpy is 86.40 J/g,and the encapsulation efficiency is 42.2％.The thermal onset decomposition temperature of the phase change fibers is high,and the melt enthalpy loss is about 3.1％after 500 thermal cycles of the experiment,which can still maintain most of the phase change ability.Thermal conductivity tests show that the thermal conductivity of the PEG@PVA membrane is between that of the shell layer PVA and core layer PEG.Temperature-time curves were obtained by simulating the temperature changes of the PEG@PVA membrane in working environment,and the results show that the phase change fiber membrane can effectively regulate the temperature of microenvironment.
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