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Lignin in Bio-Based Liquid Crystalline Network Material with Potential for Direct Ink Writing.

F Robert Gleuwitz1,2, Gopakumar Sivasankarapillai1,2, Gilberto Siqueira3

  • 1Institute of Earth and Environmental Science, Chair of Forest Biomaterials, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg 79085, Germany.

ACS Applied Bio Materials
|January 13, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed cross-linked, bio-based films with tunable mechanical properties by locking hydroxypropyl cellulose and lignin structures. These anisotropic films show potential for additive manufacturing and 3D printing applications.

Keywords:
3D printingband texturecross-linkinghydroxypropyl celluloseligninliquid crystalline network

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Anisotropic films with unique band textures are formed from blends of hydroxypropyl cellulose and organosolv lignin.
  • These water-soluble films exhibit flow-induced supramolecular arrangements.

Purpose of the Study:

  • To lock the band texture in anisotropic films via esterification using bio-based polycarboxylic acids.
  • To investigate the properties and potential applications of these cross-linked, bio-based materials.

Main Methods:

  • Shear casting of blend solutions followed by chemical cross-linking with citric acid derivatives and fatty acid dimers.
  • Analysis using polarized optical microscopy, tensile testing, Fourier transform infrared spectroscopy, and swelling experiments.
  • Rheological studies for direct ink writing applicability.

Main Results:

  • Water-insoluble, anisotropic films with tunable mechanical properties (up to 3.5 GPa modulus, 80 MPa strength) were produced.
  • Films exhibited reversible softening and texture extinguishment upon water uptake without losing anisotropy.
  • Highly concentrated solutions demonstrated suitability for direct ink writing.

Conclusions:

  • The cross-linking strategy effectively locks the supramolecular arrangement in bio-based anisotropic films.
  • These materials offer a resource-friendly pathway for additive manufacturing of 3D structures.
  • The findings highlight the potential of fully bio-based materials in advanced applications.