Soft, strong, and breathable polylactic acid/polyethylene glycol microfibrous membranes with a fluffy alignment structure for skin contactor

Polylactic acid (PLA) microfibrous membranes, having high comfort and wearability features, have attracted considerable research interest for applications involving skin contactors. However, the poor softness and low strength of these membranes are the major challenges that prevent their large-scale fabrication and application. Herein, an advanced strategy for preparing a soft, strong, and breathable polylactic acid/polyethylene glycol (PLA/PEG) microfibrous membrane using an in situ drafting-assisted melt-blowing process has been developed. The introduction of PEG significantly improved the crystallization and plasticization of the PLA chain molecules, thus promoting the perfect crystallinity of the PLA phase. Benefiting from the synergy of the PEG and the drafting process, the prepared PLA/PEG microfibrous membranes exhibited a fluffy structure wherein the air permeability increased to 142.5 mm/s with the increase in DCD to 37 cm. Meanwhile, the PLA/PEG microfibrous membranes exhibit optimized anisotropic softness performance: a smaller maximum resistance of 0.13 N in the machine direction and a larger maximum resistance of 1.8 N in the cross direction were obtained in comparison with conventional membranes. This suggests the tremendous potential for using the fabricated membranes in flexible, breathable, and wearable skin contactors.