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    Multifunctionalized Cellulose Nanofiber for Water-Repellent and Wash-Sustainable Coatings on Fabrics

    Year: 2020

    Journal: Langmuir, Volume 36, JUL 21, page 8144–8151

    Authors: Ke, Wei-Ting; Chiu, Hsien-Lung; Liao, Ying-Chih

    Organizations: Advanced Research Center of Green Materials Science and Technology from The Featured Area Research Center Program [108L9006]; Ministry of Science and Technology in TaiwanMinistry of Science and Technology, Taiwan [MOST 108-3017-F-002-002, MOST 108-2218-E002-010, 106-2628-E-002-008-MY3]

    A new synthetic route was developed to modify cellulose nanofiber for water-repellent coatings with great sustainability after multiple washing cycles. Multiple functional groups were grafted on 2,2,6,6-tetramethylpiperidine 1-oxyl radical (TEMPO)-oxidized cellulose nanofibers (TOCN) to achieve superhydrophobic performance and strong adhesion on cotton cloth. First, hexadecylamine (HDA) was used to modify TOCN surface into hydrophobic derivatives via amidation. The amidation-modified TOCN (AMT) were then grafted with a polyisocyanate cross-linking agent (PCA). The final multimodified TOCN (MMT) had hydrophobic alkyls and isocyanate groups on the surface. These surface functional groups were confirmed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). After spraying the MMT suspension on cotton fabrics, the isocyanate groups would react with hydroxyl groups on cotton fibers, leading to a uniform conformal layer of MMT on fabric surfaces. The MMT coating showed great water repellence and washing sustainability. A large contact angle of 150 degrees and a small sliding angle of similar to 10 degrees were observed. The superhydrophobic performance retained even after 10 laundry washing cycles. Several examples were also demonstrated to show the capability and the possibility of applying this coating material for water-repellent applications.
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