A self‐healing waterborne poly(urethane‐urea) on reversible covalent interaction for textile breathable coating

The solvent‐free self‐healable waterborne poly(urethane‐urea) (SH‐WPU) product is environmentally friendly due to its lower volatile organic compounds emission during the coating process. This research revealed a strategy for breathable textile coating, that longer product life of SH‐WPU coated fabr...

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Bibliographic Details
Published in:Journal of applied polymer science 2022-08, Vol.139 (32), p.n/a
Main Authors: Chen, Shu‐Yi, Cai, Sheng‐Yo, Chuang, Fu‐Sheng, Rwei, Syang‐Peng
Format: Article
Language:English
Subjects:
applications
Block copolymers
Butyric acid
Coating
coatings
Ethylene oxide
Healing
High temperature
Hydrogen bonds
Isocyanates
Materials science
Polymers
polyurethane
Propylene oxide
Recovery
Segments
Tensile tests
textiles
Ureas
VOCs
Volatile organic compounds
Water pressure
Weather
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Summary:The solvent‐free self‐healable waterborne poly(urethane‐urea) (SH‐WPU) product is environmentally friendly due to its lower volatile organic compounds emission during the coating process. This research revealed a strategy for breathable textile coating, that longer product life of SH‐WPU coated fabric based on the self‐healing dynamics that triggered by disulfide bond rearrangement upon temperature elevation (e.g., textile ironing). SH‐WPU was synthesized with 4,4′‐methylenebis cyclohexyl isocyanate as hard segment, (poly(propylene oxide)‐b‐poly (ethylene oxide)‐b‐poly (propylene oxide) triblock copolymer as soft segment. 4,4'‐Dithiodianiline (DTDA), and 2,2‐bis(hydroxymethyl)butyric acid were used as the chain‐extenders. The self‐healing efficiency was tested by simulated ironing condition. The SH‐WPU that contained 7.5 wt% of DTDA shown the highest recovery efficiency of stress at break by tensile test. The SH‐WPU coated fabric showed excellent recovery with the DTDA concentration from 4.5 to 7.5 wt% by the water pressure resistance test by disulfide and hydrogen bond rearrangement at elevated temperature. The results indicated the promising potential of SH‐WPU for breathable textile coating applications to not only overcome the damage under extreme weather conditions but also render the textile repairable by ironing.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.52773