Facile fabrication of environmentally friendly and mechanically robust transparent, waterproof, and breathable fibrous membranes

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Jing Zhao, Aohan Hou, Zhenhong Zhao, Qi Feng, Xiaohui Wu, Qijiao Jiang, Juan Xie, Gang Huang, Jianhua Yan, Xianfeng Wang
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Abstract

Functional fibrous membranes that combine optical transparency, waterproofness, and breathability are in high demand for a wide range of applications. However, these materials remain poorly developed owing to the substantial technical difficulty associated with their fabrication. Moreover, existing fabrication processes raise environmental and health concerns owing to the prevalent use of hazardous solvents. This work addresses these issues by proposing a safe, facile, and efficient strategy to fabricate transparent, waterproof, and breathable membranes (TWBMs) via an environmentally friendly process that combines electrospinning using ethanol as a green solvent and thermal curing technology involving a fluorine-free paraffin wax emulsion coating. The electrospinning process involves ethanol-soluble polyamide/aqueous polymer isocyanate fibers, and the wax coating imparts outstanding waterproofness to the fibrous membrane, while enhancing mechanical strength. Then, an optimized thermal curing process is applied to achieve a precisely controlled porous structure and membrane thickness, which generates high transparency, while preserving the microporous structure that is vital for ensuring breathability. The resulting membranes exhibit high optical transmittance of 90 %, excellent water resistance of 111.4 kPa, and adequate water vapor permeability of 5.3 kg m−2 d−1, which represent integrated properties that are far superior to those of commercially available transparent materials.

Abstract Image

易于制造的环保和机械坚固透明,防水,透气纤维膜
结合光学透明性、防水性和透气性的功能性纤维膜在广泛的应用中有着很高的需求。然而,由于制造这些材料的技术困难,这些材料的发展仍然很差。此外,由于普遍使用有害溶剂,现有的制造工艺引起了环境和健康问题。本研究提出了一种安全、简便、高效的制造透明、防水和透气膜(TWBMs)的方法,该方法采用环保工艺,结合使用乙醇作为绿色溶剂的静电纺丝技术和无氟石蜡乳液涂层的热固化技术。静电纺丝工艺涉及乙醇溶性聚酰胺/水性聚合物异氰酸酯纤维,蜡涂层使纤维膜具有出色的防水性能,同时提高了机械强度。然后,应用优化的热固化工艺来实现精确控制的多孔结构和膜厚度,从而产生高透明度,同时保留对确保透气性至关重要的微孔结构。所制得的膜具有高达90 %的高透光率,111.4 kPa的优异阻水性和5.3 kg m - 2 d - 1的良好水蒸气透气性,其综合性能远远优于市售透明材料。
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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