Waterproof and Moisture Permeable Nanofibrous Membranes with Multi-scale Cross-Linked Structure

ABSTRACT

Preventing the penetration of water while allowing it to pass through quickly is the key to achieving waterproof and breathable membranes; it opens up new possibilities for applications in all areas. Herein a novel functional nanofibrous membrane can be prepared via a facile electrospinning strategy, thermal post-treatment and chemical cross-linking, capable of providing excellent mechanical performance. Low-melting-point polyvinyl butyral (PVB) elastomer are added to polyvinylidene fluoride (PVDF) to modify the bonding network structure of the interfiber-adherent membrane, imparting durability and high mechanical properties to the membrane. Subsequently, the blocked isocyanate prepolymer (BIP) is used as the chemical cross-linker with PVDF and polyvinyl butyral (PVB) hybrid system to strengthen the cross-linking structure. Through systematically characterize the morphologies, contact angle, water vapor transmittance rate (WVTR) and hydrostatic pressure, it is studied that the effect of concentrate of PVDF/PVB/BIP and thermal-induced temperature on the waterproofness and breathability. The results indicate that the prepared nanofibrous membranes can maintain highly hydrostatic pressure (93.27kPa) and high WVTR (10.28 kg m⁻² d⁻¹); meanwhile, the membranes exhibit the excellent tensile stress (13.07MPa), indicating that it has a broad potential application prospect in the separation process and protective clothing.

摘要

防止水的渗透, 同时让水快速通过, 是实现防水透气膜的关键; 它为所有领域的应用开辟了新的可能性. 本文通过简单的静电纺丝、热后处理和化学交联制备4E86一种新型功能性纳米纤维膜, 具有优异的力学性能. 在聚偏氟乙烯 (PVDF) 中加入低熔点聚乙烯醇缩丁醛 (PVB) 弹性体, 改变了纤维间粘附膜的结合网络结构, 提高了膜的耐久性和力学性能. 随后, 采用封闭异氰酸酯预聚物 (BIP) 作为化学交联剂, 与PVDF和聚乙烯醇缩丁醛 (PVB) 杂化体系进行交联增强. 通过对PVDF/PVB/BIP的形态、接触角、水蒸气透过率 (WVTR) 和静水压力的系统表征, 研究了PVDF/PVB/BIP的浓度和热诱导温度对其防水透气性的影响. 结果表明, 所制备的纳米纤维膜能保持较高的静水压力 (93.27kPa) 和较高的湿重比 (10.28kgm-2 d-1), 同时具有良好的拉伸应力 (13.07MPa), 在分离过程和防护服方面具有广阔的应用前景.

KEYWORDS:

• Polyvinylidene-fluoride
• waterproof and moisture permeable
• microporous membrane
• electrospinning
• multi-scale cross-linked

关键词:

• 聚偏氟乙烯
• 防水透湿
• 微孔膜
• 静电纺丝
• 多尺度交联

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 11702169), National Natural Science Foundation of China (Grant No.21808165), Scientific Research Staring Foundation of Shanghai University of Engineering Science (Grant No. 2017-19), and Talents Action Program of Shanghai University of Engineering Science (Grant No. 2017RC522017). This work was also supported by Talents Action Program of Shanghai University of Engineering Science (Grant No. 2017RC432017). Shanghai Local Capacity-Building Project (Grant No. 19030501200), and the National Natural Science Youth Fund (Grant No. 2041808165).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 11702169), Talents Action Program of Shanghai University of Engineering Science (Grant No. 2017RC522017), and Shanghai Local Capacity-Building Project (Grant No. 19030501200). This work is also supported by the National Natural Science Youth Fund (Grant No. 21808165), Scientific Research Foundation funds of Shanghai University of Engineering Science (Grant No. 0239-E3-0507-19-05161).