Novel Janus Fibrous Membranes with Enhanced Directional Water Vapor Transmission
Novel Janus Fibrous Membranes with Enhanced Directional Water Vapor Transmission
复制标题
具有增强定向水蒸气传输能力的新型 Janus 纤维膜
DOI：
10.3390/app9163302
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发表时间：
2019-08-01
影响因子：
2.7
通讯作者：
Zhang, Xiuqin
中科院分区：
文献类型：
--
作者：
Tang, Shengnan;Pi, Haohong;Zhang, Xiuqin
采用层层静电纺丝技术制备了新型疏水/亲水Janus纤维膜，即疏水层为聚[4，4 '-亚甲基双（苯基异氰酸酯）-alt-1，4-丁二醇/二（丙二醇）/ε-己内酯]（PU）纤维膜，亲水层为醋酸纤维素（CA）纤维膜。通过改变CA层的静电纺丝时间，制备了一系列可控制亲水层厚度的PU/CA Janus膜，考察了其对水蒸气定向透过性能的影响。结果表明，PU/CA Janus纤维膜从疏水侧到亲水侧的水蒸气透过能力比从亲水侧到疏水侧的水蒸气透过能力强。当静电纺丝时间达到15 min时，CA纤维膜的水蒸气透过能力最佳。这种增强的水蒸气透过能力源于Janus膜的非对称润湿性和将微小水滴从疏水侧吸引到亲水侧的强大力。这一新的认识有助于设计和制造高透湿织物和服装。
Novel hydrophobic/hydrophilic Janus fibrous membranes, the poly[4,4 '-methylenebis (phenylisocyanate)-alt-1,4-butanediol/di(propylene glycol)/plycaprolactone] (PU) fibrous membrane as the hydrophobic layer and cellulose acetate (CA) fibrous membrane as the hydrophilic layer, were fabricated by the so-called layer-by-layer electrospinning technology. A series of the PU/CA Janus membranes with different electrospinning time of the CA layers by which the thickness of hydrophilic layer can be controlled were also prepared to uncover its influence on the directional water vapor transmission. The results showed that water vapor transmission capability from the hydrophobic side to the hydrophilic side of the PU/CA Janus fibrous membrane was enhanced rather than that from the reverse direction of the same membrane. The optimal water vapor transmission capacity existed when the electrospinning time of CA fibrous membrane reached 15 min. Such enhanced water vapor transmission originated because of the asymmetric wettability of the Janus membrane and the strong force to draw tiny water droplet from the hydrophobic side to the hydrophilic side. The novel understanding is useful for facile designing and fabrication of efficient moisture permeable fabrics and clothing.