Waterproof and breathable microporous membranes have received extensive attention in recent years due to their unique feature of allowing water vapor transfer and preventing water droplets from passing through. It has been widely used in protective clothing, filtration, membrane distillation and other fields, especially in apparel applications.
In general, the waterproof and moisture permeability of microporous membranes is obtained by the synergistic effect between the hydrophobic surface and the porous structure. The synergistic effect between the two can not only prevent the penetration of water droplets but also provide interconnected channels for water vapor transmission.
At present, the waterproof and breathable microporous membranes sold in the market are mainly prepared by methods such as hot stretching, coating and lamination, but these methods face many problems such as complicated preparation process and inflexible adjustment of porous structure. Therefore, there is an urgent need to develop novel and simple processes to prepare waterproof and breathable microporous membranes.
In recent years, the use of electrospinning technology to prepare microporous membranes has proved to be a feasible strategy, which mainly obtains nonwoven fabric-like fiber membranes with a porous structure by random accumulation of nanofibers-microporous nanomembranes have the group It has the characteristics of controllable sub-structure and waterproof, hydrophobic characteristics, simple preparation process and low cost.
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