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Temperature responsive crosslinked starch-kraft lignin macromolecule.

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Researchers created a novel temperature-responsive material by crosslinking Kraft lignin (KL) and starch. This sustainable biopolymer blend forms a gel-like structure, offering potential for new hydrogel and film applications.

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CrosslinkingLigninPhysicochemical characterizationStarchTemperature-responsive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Starch is a water-insoluble natural polymer.
  • Kraft lignin (KL) is a complex biopolymer by-product from wood processing.
  • Developing novel biopolymer materials with tunable properties is of significant interest.

Purpose of the Study:

  • To develop a temperature-responsive macromolecule by crosslinking Kraft lignin and starch.
  • To characterize the structure and properties of the resulting crosslinked material (KLS).
  • To explore the potential applications of KLS in areas like hydrogels and films.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) and X-ray Photoelectron Spectroscopy (XPS) for structural analysis.
  • Rheological analysis to study the network formation and temperature-responsive behavior.
  • Varying crosslinking degrees to optimize material properties.

Main Results:

  • Successful crosslinking of KL and starch confirmed by NMR and XPS, showing increased C-O-C bonds.
  • KLS dispersions exhibited a thermo-responsive structured network with temperature-dependent solubility.
  • Incorporation of KL and ether crosslinks enhanced thermal stability and formed a gel-like structure (KLS-5) after heating-cooling treatment.

Conclusions:

  • Kraft lignin and starch can be effectively crosslinked to create sustainable, temperature-responsive macromolecular materials.
  • The properties of KLS are influenced by starch hydrophilicity, crosslinking density, and KL characteristics.
  • The developed KLS material shows promise for applications in temperature-responsive hydrogels and films.