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Green preparation of lignin nanoparticles in an aqueous hydrotropic solution and application in biobased nanocomposite films

  • Mingyan Yang ORCID logo EMAIL logo , Xiao Zhang , Shuyi Guan , Yan Dou , Xiaofeng Gao and Linping Miao
Published/Copyright: September 13, 2020
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Abstract

Lignin nanoparticles (LNPs) from lignocellulosic biomass are expected to become promising basic building blocks for various applications in the development of multifunctional nanocomposites. Facile green preparation of LNPs and their application in polyvinyl alcohol (PVA) composite films were studied in this paper. LNPs were produced by performing fractionation of wheat straws at less than 80 °C with a recyclable hydrotropic, aqueous p-toluene sulfonic acid (p-TsOH). The dissolved lignin could be simply separated as LNPs by diluting the spent liquor (SL) to below the minimal hydrotropic concentration (MHC) of 11.5%. The resulting LPNs exhibited an oblate spheroid morphology and a uniform particle size distribution. After introducing the available LNPs into the PVA matrix at 6% loading, the nanocomposite products could block 100 and 95% of UV light at 315 and 400 nm, respectively, and exhibited 80% antioxidant activity. In addition, the respective maximum TS and TM were 59.7 MPa and 2.07 GPa, respectively, which were increases of approximately 36 and 104% compared with those of pure PVA film. The LNPs/PVA nanocomposite films displayed improved UV resistance, mechanical properties, thermal stability and antioxidant activity and could be used as additional multifunctional agents in the fields of biodegradable plastics, tissue engineering and UV-protective biobased materials.


Corresponding author: Mingyan Yang, School of Water and Environment, Chang’an University, Xi’an, 710054, China; Shaanxi Key Laboratory of Exploration and Comprehensive Utilization of Mineral Resources, Xi’an, 710054, China, E-mail:

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by the Natural Science Foundation of Shaanxi Province (grant numbers 2015SF263, 2018JQ4042).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-01-18
Accepted: 2020-08-11
Published Online: 2020-09-13
Published in Print: 2021-05-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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