Abstract
Photo-crosslinkable poly (vinyl alcohol)-g-glycidyl methacrylate/cellulose nanocrystal-g-methacrylic anhydride (PVA-g-GMA/CNC-g-MA) composites were developed through solution casting. After UV crosslinking, a significant increase of 137% in tensile strength, a decrease of 65.45% in water absorption, and a decrease of 34.3% (in 98% relative humidity) in water vapor barrier property were obtained for the PVA-g-GMA/10% CNC-g-MA composite compared to those of pure PVA, exhibiting excellent mechanical, water resistance, and noticeable humidity stability. It is because UV photo-crosslinking significantly improves the interaction between PVA-g-GMA and CNC-g-MA in PVA-g-GMA/CNC-g-MA composites even under high humidity. In addition, CNC-g-MA was evenly distributed in the PVA-g-GMA matrix in PVA-g-GMA/10% CNC-g-MA composites, and the hydrophobicity of MA and GMA endows the PVA-g-GMA/10% CNC-g-MA composites with low surface hydrophobicity and excellent water resistance, water vapor barrier property and barrier stability in high humidity. Overall, a new, effective, and environment-friendly method for the preparation of PVA/CNC based composite is demonstrated, offering a great value in packaging applications.
Graphical abstract
Photo-crosslinkable poly (vinyl alcohol)-g-glycidyl methacrylate/cellulose nanocrystal-g-methacrylic anhydride (PVA-g-GMA/CNC-g-MA) composites were developed through solution casting. After UV crosslinking, PVA-g-GMA/CNC-g-MA composites possessed excellent mechanical, water resistance, noticeable humidity stability, and low surface hydrophobicity.
Schematic diagram of photo-crosslinking of PVA-g-GMA and CNC-g-MA.
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Acknowledgments
This work is supported by the MOE & SAFEA for the 111 Project (B13025). The authors also thank Dr. Wei Wang for his valuable suggestions in the process of revising the manuscript.
Funding
The MOE & SAFEA for the 111 Project No. B13025, Huiyu Bai.
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Bai, H., Li, Y., Zhang, S. et al. Photo-crosslinkable poly (vinyl alcohol)/nanocrystalline cellulose composites with controllable performance and exceptional water vapor barrier property for packaging application. Cellulose 29, 7721–7734 (2022). https://doi.org/10.1007/s10570-022-04760-x
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DOI: https://doi.org/10.1007/s10570-022-04760-x