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Existing waterproof and breathable membranes (such as polytetrafluoroethylene PTFE microporous membranes) have poor elasticity and use environmentally harmful substances (such as perfluorooctanoic acid and PFOA) in the manufacturing process.
The original polyurethane nanofiber membrane (PU nanofiber WBM) has poor hydrophobicity and uses toxic solvents in the manufacturing process, leading to water and air pollution.
Use water as a solvent to avoid the use of toxic and harmful solvents.
It has a stable porous structure and strong hydrophobicity.
It has good tensile deformation characteristics and resilience.
It has small pore size, high porosity, high waterproofness and breathability.
Use aqueous emulsion electrospinning technology and heat treatment to construct hydrophobic channels with small pore size and high porosity.
Through spinning solutions with different contents of polyethylene oxide (PEO) and epichlorohydrin (TTMA), and different proportions of aqueous fluoropolymer (WFE) emulsions, spinning through electrospinning equipment and cross-linking after heat treatment.
The nanofiber membrane is prepared using water-based polyurethane, which has waterproof and breathable properties, and no toxic solvents are used in the production process.
High-performance nanofiber membranes are prepared by emulsion electrospinning technology and heat treatment.
Nanofiber membranes with porous structure and strong hydrophobicity are constructed by adding water-based fluoropolymers and epichlorohydrin (TTMA) crosslinkers to water-based polyurethane.
The prepared water-based polyurethane nanofiber membrane has good physical properties, such as high waterproofness (water pressure 74.3 kPa), air permeability (gas permeability 9.3 mm/s), water vapor permeability (12.8 kg/m^2·d) and high elasticity (67.4%).
In the study, environmentally friendly water-based polyurethane nanofiber membranes with high water resistance and air permeability were prepared using water-based emulsion electrospinning technology and heat treatment.
Through emulsion electrospinning technology, hydrophobic channels with small pore size and high porosity were constructed by in-situ doping of water-based fluoropolymers and epichlorohydrin crosslinkers combined with heat treatment.
The prepared water-treated PU nanofibrous membranes showed good water and blood intrusion pressure, air permeability, water vapor permeability, and high elasticity.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1016/j.cej.2021.130925
