4.7 Article

Strong, transparent, and thermochromic composite hydrogel from wood derived highly mesoporous cellulose network and PNIPAM

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ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106757

关键词

Composite hydrogel; A; Cellulose; B; Mechanical properties; B; Optical properties

资金

  1. Wallenberg Wood Science Center (WWSC)
  2. China Scholarship Council (CSC)
  3. European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [742733]

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In this study, a strong and transparent composite hydrogel was developed from a mesoporous cellulose network prepared from wood. The hydrogel exhibited high water content and optical transmittance, as well as anisotropic optical and mechanical properties. Additionally, the hydrogel showed reversible thermochromic behavior between transparent and white states, demonstrating great potential for optical applications.
Composite polymer hydrogels are of significant interests for high optical transparency and mechanical performance. In this work, a strong and transparent composite hydrogel is developed from a highly mesoporous cellulose network prepared from wood via top-down delignification followed by TEMPO-mediated oxidation and in situ polymerization of PNIPAM. Individualization of cellulose microfibrils inside the wood cell wall is critical for the fabrication of free-standing composite hydrogel with high water content of 94.9 wt% and high optical transmittance of 85.8% with anisotropic light scattering behavior. The composite hydrogel also showed anisotropic mechanical properties with a tensile strength, Young's modulus and toughness of 317 kPa, 5.4 MPa, and 39.2 kJ m- 3 in axial direction, and 152 kPa, 0.31 MPa and 57.1 kJ m- 3 in the transverse direction, respectively. It also showed thermochromic behavior, i.e., reversibly changing between transparent and brightly white by a temperature change between 25 and 40 degrees C, demonstrating great potential for optical applications.

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