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首页> 外文期刊>RSC Advances >Fluorinated polyurethane macroporous membranes with waterproof, breathable and mechanical performance improved by lithium chloride
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Fluorinated polyurethane macroporous membranes with waterproof, breathable and mechanical performance improved by lithium chloride

机译：氯化锂改善了具有防水，透气和机械性能的氟化聚氨酯大孔膜

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摘要

Macroporous membranes that could completely resist liquid water penetration and easily permit water vapor transmission would have great significance in numerous areas. However, current fabrication strategies for such materials still suffer from a series of problems. Herein, we reported a kind of waterproof and breathable macroporous membrane fabricated from polyurethane (PU), fluorinated polyurethane (FPU), and lithium chloride (LiCl) via electrospinning. Benefiting from the diversification of conductivity adjusted by LiCl, characteristics of the membranes including fiber diameter, pore size and distribution, even the orientation and aggregation of macromolecules could be simultaneously regulated, which brought about tremendous improvement of waterproof, breathable and mechanical performance. Significantly, the relationship among waterproofness, wettability and pore size has been confirmed to be finely consistent with the Young-Laplace equation. Meanwhile, mechanical performance was investigated on the basis of macromolecular orientation that was evaluated by polarized infrared spectroscopy. Ultimately, the resultant membranes exhibited integrated performance with improved hydrostatic pressure (82.1 kPa) and water vapor transmission rate (10.9 kg m(-2) d(-1)), as well as enhanced tensile strength (11.6 MPa) and bursting strength (8.2 kPa), which would make them promising alternatives for many potential applications, especially in protective clothing fabrication.
机译：可以完全抵抗液体水渗透并容易允许水蒸气透过的大孔膜在许多领域都具有重要意义。然而，当前用于这种材料的制造策略仍然遭受一系列问题。在本文中，我们报道了一种通过静电纺丝由聚氨酯（PU），氟化聚氨酯（FPU）和氯化锂（LiCl）制成的防水透气大孔膜。受益于LiCl调节的电导率的多样化，可以同时调节膜的特性，包括纤维直径，孔径和分布，甚至大分子的取向和聚集，从而极大地改善了防水，透气和机械性能。显着地，已经证实防水性，润湿性和孔径之间的关系与Young-Laplace方程精确地一致。同时，基于通过偏振红外光谱法评估的大分子取向来研究机械性能。最终，所得的膜表现出综合性能，并具有改善的静水压力（82.1 kPa）和水蒸气透过率（10.9 kg m（-2）d（-1）），以及增强的拉伸强度（11.6 MPa）和破裂强度（ 8.2 kPa），这将使其成为许多潜在应用的有希望的替代品，尤其是在防护服的制造中。

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