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Production of UV-shielded spherical lignin particles as multifunctional bio-additives for polyvinyl alcohol composite films

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Abstract

This work reports on a green and simple procedure to manufacture spherical lignin particles (SLPs) in sub-micron scale. Softwood kraft lignin was fractionated using a ubiquitous organic solvent, acetone, which is recoverable and reused in a following step to produce SLPs via self-assembly method. A portion phenolic content was increased in acetone-soluble lignin. The SLPs with an average diameter of 736 ± 39 nm were produced and used as natural-multifunctional additive for polyvinyl alcohol (PVA) films. Moreover, we presented a developed composite film of polyvinyl alcohol (PVA/SLPs) with an excellent UV-shielding ability and retaining its transparency. Enhancement in thermal and mechanical properties and UV-shielding ability of the obtained PVA/SLPs composite films was demonstrated. With only 0.2 wt% incorporation of SLPs, the composite film (PVA/0.2SLPs) exhibited melting temperature at 177 ± 2.6 °C, approximately 15 °C higher than that of the neat PVA film. Crystallinity of PVA/0.2SPLs composite film increased by 80% compared with the neat film. Modulus of the composite films was increased significantly from 1.7 ± 0.1 to 2.0 ± 0.2 GPa with 0.2 wt% loading of lignin particles. UV transmittance in both UVA and UVB regions through PVA/0.2SPLs composite films was significantly decreased while a satisfactory visible light transmittance was retained. This work provides a simple and green process for producing SLPs, which can be used in PVA films as UV-shielding agent and enhancer of thermal and mechanical properties.

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Acknowledgements

Authors wish to acknowledge Prof. Dr. S. Seraphin, Professional Authorship Center (PAC), NSTDA for useful suggestions.

Funding

Authors appreciate the funding support from National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Thailand (No.2052415).

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Correspondence to Bongkot Hararak.

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The authors declare no competing interests.

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Hararak, B., Winotapun, C., Inyai, J. et al. Production of UV-shielded spherical lignin particles as multifunctional bio-additives for polyvinyl alcohol composite films. J Nanopart Res 23, 193 (2021). https://doi.org/10.1007/s11051-021-05308-z

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  • DOI: https://doi.org/10.1007/s11051-021-05308-z

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