Hydrophobic polyvinylidene fluoride fibrous membranes with simultaneously water/windproof and breathable performance
Hydrophobic polyvinylidene fluoride fibrous membranes with simultaneously water/windproof and breathable performance
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同时具有防水、防风和透气性能的疏水性聚偏氟乙烯纤维膜
DOI：
10.1039/c6ra17565a
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发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Ding, Bin
中科院分区：
文献类型：
--
作者：
Yang, Fangfang;Li, Yang;Ding, Bin
防水/防风和透气膜在许多应用中是重要的，这是由于它们对水和风渗透的抵抗力以及蒸汽传输的允许性;然而，这种膜的制造仍然是一个严重的挑战。本文以聚偏氟乙烯（PVDF）为原料，采用静电纺丝法制备了一种新型的具有良好防水、防风和透气性能的疏水纤维膜。通过调节PVDF溶液中DMAc/丙酮的比例和NaCl的浓度，可以很好地调节膜的纤维和多孔结构。在DMAc/丙酮比为7/3、NaCl浓度为0.003wt%的溶液中制得的纤维膜具有最佳的孔结构，其最大孔径为1.2 μm，平均孔径为0.8 μm，孔隙率为76.2%。疏水性和多孔结构的协同效应赋予膜同时具有良好的防水（110 kPa的静水压力）、防风（6.1 mm s-1的空气渗透率）和透气（11.5 kg m-2 d-1的水蒸气透过率）性能。同时，PVDF所得膜还显示出高强度（断裂应力为11.1MPa）和优异韧性（断裂能为6.4mJ m-3）的稳健机械性能。因此，所制备的纤维膜具有良好的防水、防风、透气性能，同时具有较强的力学性能，将成为许多领域的关键材料，特别是在防护服的制造中。
Water/windproof and breathable membranes are important in many applications due to their resistance to water and wind penetration as well as permissibility of vapor transmitting; nevertheless, fabrication of such membranes remains a serious challenge. Herein, we have prepared a novel kind of hydrophobic fibrous membrane with good water/windproof and breathable performance via electrospinning by using polyvinylidene fluoride (PVDF) as a raw polymer. The fibrous and porous structure of the membranes have been finely regulated by tuning the DMAc/acetone ratios and NaCl concentrations in the PVDF solutions. The resultant fibrous membranes obtained from the solutions with a DMAc/acetone ratio of 7/3 and NaCl concentration of 0.003 wt% possessed an optimized porous structure with maximum pore size of 1.2 μm, mean pore size of 0.8 μm and porosity of 76.2%. The synergetic effect of hydrophobicity and porous structure endowed the membranes with simultaneously good waterproof (hydrostatic pressure of 110 kPa), windproof (air permeability of 6.1 mm s−1) and breathable (water vapor transmission rate of 11.5 kg m−2 d−1) performance. Meanwhile, the PVDF resultant membranes also exhibited robust mechanical performance with high strength (breakage stress of 11.1 MPa) and excellent toughness (energy to break of 6.4 mJ m−3). Therefore, the as-prepared fibrous membranes with good water/windproof and breathable performance, as well as robust mechanical property, would become a key material in many areas, especially in fabricating protective clothing.