Abstract
In this research, the dopamine self-polymerization was used to coat polydopamine (PDA) on cellulose nanocrystal (CNC) surfaces, and we integrated the functionality and structural merits of the two components in poly(vinyl alcohol) (PVA) films at a nanometer scale. The results showed that coating PDA on CNCs led to a concurrent increase in strength and break elongation. With increasing PDA@CNC loading level, the Young’s modulus continuously increased, which could be ca. 3.1-fold over that of neat PVA film at a loading level of 15 wt%. Both tensile strength and breaking elongation of the nanocomposite reached the maximum values with 6 wt% PDA@CNC, which were 75.8% and 58.1% more than those of neat PVA, respectively. Besides, the maximum decomposition temperature shifted from 271.3 °C of neat PVA film to 278.5 °C of the nanocomposite containing 6 wt% PDA@CNC, and then was continuously elevated up to 328.2 °C when the PDA@CNC loading level reached 15 wt%. For packaging application, the PDA component contributed to the UV-shielding and radical-scavenging functions, and the PDA@CNC nanofiller reduced the permeability of oxygen and water–vapor into PVA-based composites. Overall, the integrated PDA@CNC nanofiller as an active ingredient enhanced the mechanical, thermal, and functional properties of the PVA-based materials, and hence intensified the potential of their packaging application.
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This work was supported by the National Natural Science Foundation of China (51373131) and Talent Project of Southwest University (SWU115034).
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Liu, S., Chen, Y., Liu, C. et al. Polydopamine-coated cellulose nanocrystals as an active ingredient in poly(vinyl alcohol) films towards intensifying packaging application potential. Cellulose 26, 9599–9612 (2019). https://doi.org/10.1007/s10570-019-02749-7
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DOI: https://doi.org/10.1007/s10570-019-02749-7