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<p>Bacterial cellulose (BC), as a high-purity nanofiber material synthesized by microorganisms, has attracted significant attention due to its unique three-dimensional network structure, high crystallinity, and excellent mechanical properties. This study systematically investigated the mechanisms by which different post-treatment methods regulate the structure and mechanical properties of bacterial cellulose film (BCF). The raw BCF has a tensile strength of 42.33 ± 4.25&#xa0;MPa and an elongation at break of 1.43 ± 0.06%, due to the Maillard reaction caused by residual sugars forming cross-linked by-products. Washing treatment, by eliminating sugar impurities and reconstructing the hydrogen bond network, increased the tensile strength to 103.09 ± 12.67&#xa0;MPa but decreased the elongation at break to 0.92 ± 0.27%. Alkali treatment, which removes impurities while disrupting the original hydrogen bonds and forming a new high-strength network, achieved a tensile strength of 106.83 ± 15.81&#xa0;MPa, showing no significant difference from the washing treatment dominated by purification mechanisms. A breakthrough was observed in the BC/pulp composite film, which achieved a synergistic improvement in tensile strength (269.30 ± 1.83&#xa0;MPa) and elongation at break (2.15 ± 0.03%). The composite film has a crystallinity index of 69.8% and good thermal stability, with a maximum decomposition temperature of 386&#xa0;℃. The results of this study provide new strategies for the development of high-strength bio-based materials.</p>

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Structure–property correlation in reinforced bacterial cellulose films prepared by blending with pulp fibers

  • 期刊论文

  • 发表日期：

    2025年11月30日

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  • Changjie Chen,
  • Hao Zhu,
  • Xinhou Wang

摘要

Bacterial cellulose (BC), as a high-purity nanofiber material synthesized by microorganisms, has attracted significant attention due to its unique three-dimensional network structure, high crystallinity, and excellent mechanical properties. This study systematically investigated the mechanisms by which different post-treatment methods regulate the structure and mechanical properties of bacterial cellulose film (BCF). The raw BCF has a tensile strength of 42.33 ± 4.25 MPa and an elongation at break of 1.43 ± 0.06%, due to the Maillard reaction caused by residual sugars forming cross-linked by-products. Washing treatment, by eliminating sugar impurities and reconstructing the hydrogen bond network, increased the tensile strength to 103.09 ± 12.67 MPa but decreased the elongation at break to 0.92 ± 0.27%. Alkali treatment, which removes impurities while disrupting the original hydrogen bonds and forming a new high-strength network, achieved a tensile strength of 106.83 ± 15.81 MPa, showing no significant difference from the washing treatment dominated by purification mechanisms. A breakthrough was observed in the BC/pulp composite film, which achieved a synergistic improvement in tensile strength (269.30 ± 1.83 MPa) and elongation at break (2.15 ± 0.03%). The composite film has a crystallinity index of 69.8% and good thermal stability, with a maximum decomposition temperature of 386 ℃. The results of this study provide new strategies for the development of high-strength bio-based materials.