Preparation and thermal management performance of thermoregulated fabric based on polyvinyl butyral/polyethylene glycol coaxial nanofiber membrane
Objective In order to enhance the thermal comfort properties of textiles,this study employs the coaxial electrospinning method to fabricate a composite nanofibrous membrane with polyvinyl alcohol formaldehyde(PVB)as the skin layer and PEG2000 as the core layer(PVB/PEG).Simultaneously,a sandwiched phase change heat storage composite fabric is designed using the as-prepared PVB/PEG nanofibrous membranes.The fabric exhibits excellent heat storage and release properties and offers an effective thermoregulated effect.Method Coaxial electrospinning technology was employed to fabricate PVB/PEG nanofibrous membranes with various fiber skin/core ratios.Using nanofibers with fiber skin/core(2∶1)ratio as the sandwiched layers,single-layer(T1),double-layer(T2),and triple-layer(T3)PVB/PEG composite fabrics were prepared.Phase change enthalpy,thermal storage performance,and fabric's thermal management ability were tested by SEM,TEM,DSC,thermal infrared imaging,and thermocouples.Results The PVB/PEG nanofibers had a continuous core-shell structure with diameters ranging from 244 to 372 nm,and phase change enthalpy is between 27-47 J/g.The phase change enthalpy of T1,T2,and T3 fabrics ranged from 6-14 J/g and were closely related to the PEG contents in the nanofibers.The fabrics maintained good shape stability at 65℃and thermal energy storage and temperature regulation capabilities keep stable after 100 thermal cycles,demonstrating the composite fabric's repeatability.The 50℃thermal buffering platform demonstrated the fabric's good temperature-regulating effect,and the thermal buffering time depends on the amount of nanofiber membrane layers.Conclusion The composite fabrics ensure good thermal buffering effects,and they reduce the fabric's breathability and moisture permeability at loading triple-layered nanofibrous membranes.Achieving balance of thermal comfort and fabric properties is of importance in obtaining the satisfied nanofiber diameter,phase change material content,and fabric thickness.This opens a promising application in personal thermal management textiles.
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