Fluorinated polyurethane macroporous membranes with waterproof, breathable and mechanical performance improved by lithium chloride
Fluorinated polyurethane macroporous membranes with waterproof, breathable and mechanical performance improved by lithium chloride
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氯化锂改善防水、透气和机械性能的氟化聚氨酯大孔膜
DOI：
10.1039/c5ra15302f
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发表时间：
2015-09
期刊：
影响因子：
3.9
通讯作者：
Bin Ding
中科院分区：
文献类型：
--
作者：
Longwei Zhang;Yang Li;俞建勇;Bin Ding
大孔膜能够完全阻止液态水渗透并容易允许水蒸气透过，这在许多领域具有重要意义。然而，目前这种材料的制造策略仍然存在一系列问题。本文报道了一种以聚氨酯（PU）、氟化聚氨酯（FPU）和氯化锂（LiCl）为原料，采用静电纺丝法制备的防水透气大孔膜。利用LiCl对电导率的调节，可以同时调控膜的纤维直径、孔径大小和分布，甚至大分子的取向和聚集状态，从而极大地改善膜的防水、透气和力学性能。值得注意的是，防水性，润湿性和孔径之间的关系已被证实是精细符合杨拉普拉斯方程。同时，通过偏振红外光谱法对材料的大分子取向进行了表征，并对其力学性能进行了研究。最终，所得膜表现出综合性能，具有改进的静水压力（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），这将使它们成为许多潜在应用的有希望的替代品，特别是在防护服制造中。
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.
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