Preparation Of Polyethylene Glycol Based Phase Change Energy Storage Fibers By Electrospinning

The problem of PCM leakage can be solved by encapsulating PCM in one-dimensional linear fiber by electrospinning,and phase change fiber with diameter ranging from tens of nanometers to several microns can be prepared.PCM in phase change fiber can exchange heat with the external environment through phase change within the phase change temperature range to maintain the stability of microenvironment temperature.It has great application value in comfortable smart clothing,heat dissipation of electronic components,medical gauze and dressing insulation.Firstly,PEG/PA6 phase change fiber was prepared with PEG 1000 as PCM and PA6 as support material.When the mass ratio of PA6/PEG was 2:1,the phase change fiber contained high content of PCM,and the fiber could still maintain good surface morphology.In addition,the loading of Ti O₂ improves the UV shielding ability of phase change fiber.When the content of Ti O₂ is 10wt%,the melting temperature and enthalpy of phase change fiber are 36.61^°C and 51.14 J/g.After 500 thermal cycles,the morphology and heat storage properties of phase change fibers changed slightly.The prepared PEG/PA6/Ti O₂ has the functions of temperature regulation and UV shielding,and can be used as a candidate material for intelligent temperature control textiles.In order to achieve better packaging effect and greater heat storage density,core-shell phase change fibers with different core solution concentration and liquid inlet speed were prepared by coaxial electrospinning.For coxial electrospinning,PEG 4000 with high phase change enthalpy used as the core PCM and PVA used as the shell support material when green and low-cost water used as the solvent of core and shell material.When the PEG concentration is 45wt%and the liquid inlet speed is 0.06 m L/h,PEG@PVA With good morphology and high content of PEG,the core-shell interface of phase change fiber is obvious,and PEG has good chemical compatibility with PVA.For PEG@PVA,the melting temperature is 62.81^°C,the melting enthalpy is 86.40 J/g and the packaging efficiency is 42.2%.The thermal initial decomposition temperature of phase change fiber is high,and after 500 thermal cycles,the melting enthalpy loss is about 3.1%,which can still maintain most of the phase change ability.The thermal conductivity of the PEG@PVA membrane is lower than that of pure PEG,which is due to the low thermal conductivity of PVA in the shell.From the temperature regulation curve,it can be seen that the phase change fiber membrane can effectively adjust the temperature of the microenvironment.In order to improve the thermal conductivity of phase change fiber,low mass concentration of GO was loaded into the shell of phase change fiber.On this basis,CNTs were acidified and loaded into the core layer of phase change fiber to realize the synergistic thermal conductivity enhancement between two-dimensional plane GO and one-dimensional linear CNTs.Go and CNTs have little effect on the morphology,structure and thermal stability of phase change fiber.The melting enthalpy of GO-1.5 is82.54 J/g and the packaging efficiency is 40.3%.The melting enthalpy of CNTs-0.5 is80.13 J/g,the packaging efficiency is 39.2%and the thermal conductivity is0.521 W/（m·K）,which increased by 130%compared with PEG@PVA membrane and showed better temperature regulation performance.After 500 thermal cycles,the morphology and heat storage performance of phase change fiber have little change,and could be used in the working scene for a long time.