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Hydrophobic and mechanical strength enhancement of hemp fabric and paper enabled by waterborne polyurethane-derived functional coating

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Abstract

Cellulosic-based materials such as hemp fabric and paper have combined characteristics of renewability, biodegradability, flexibility, and recyclability. However, regular products are not suitable for use in unconventional applications due to inherent limitations, and accordingly, enabling new capabilities is a necessity. To this end, the conversion of regular hemp fabric and paper into high-strength products with hydrophobic function via surface engineering was explored. The fluorinated waterborne polyurethane (FWPU) emulsions were first synthesized as functional coatings by in-situ polymerization. The structure and properties of the FWPU emulsion and film were characterized by FTIR, XRD, SEM, TG, and XPS. The results showed that the grafting of perfluorooctanol imparts WPU film excellent hydrophobicity, and the water contact angle increases from 71.2° to 105.9°. After the FWPU coating, the water contact angles of the hemp fabric and paper increase from 0° to 117.1° and 112.8°, respectively. Quite encouragingly, the coating generation of waterborne polyurethane-derived functional additives led to the increase of mechanical strength by more than 23% and 82%, in the case of qualitative filter paper and hemp fabric. Meanwhile, the folding strength of filter paper is increased by 132 times. Overall, this functionalized waterborne polyurethane coating would direct paper and hemp fabric toward diversified applications.

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Funding

This work was supported by the Heilongjiang Provincial Department of Education for the Basic Research Funds Research Project (145209509) and the Qiqihar University Postgraduate Innovation Research Project (YJSCX2022025).

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WZ and ZS contributed to the experimental work and writing. QZ, LS and BZ were responsible for the literature search and analysis. All authors read and approved the final manuscript.

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Correspondence to Zhihui Sui.

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The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

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Zhao, W., Sui, Z., Zhang, Q. et al. Hydrophobic and mechanical strength enhancement of hemp fabric and paper enabled by waterborne polyurethane-derived functional coating. Cellulose 31, 1687–1703 (2024). https://doi.org/10.1007/s10570-023-05703-w

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  • DOI: https://doi.org/10.1007/s10570-023-05703-w

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