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Bio-based polymer coatings with re-mendable thermo-responsive properties
Project status: Ongoing
EN / RO
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STAGE I/202 SUMMARY:

  • The raw materials (from renewable sources) were functionalized as follows: chitosan was grafted with furyl groups and castor oil with maleimide groups.
  • The structure of the resulting compounds was elucidated using FTIR and 1H-NMR spectroscopies.
  • Crosslinking of chitosan proceeded through the Diels-Alder reaction of the furyl groups grafted onto its backbone and the maleimidic ones from the functionalized castor oil structure.
  • All the result indicators foreseen in the "project implementation plan" were achieved: 1 participation in scientific events (1 oral presentation), creation of the project website.

 

STAGE II/2023 SUMMARY:

  • A model compound was obtained; its structure and the ones of reaction intermediates were confirmed using ATR-FTIR and 1H-NMR spectroscopies.
  • The crosslinking of chitosan grafted with furyl units proceeded through its DA reaction with maleimide functionalized castor oil; the structure of biofilms was highlighted using ATR-FTIR spectroscopy.
  • Thermogravimetric analysis showed an improvement in the thermal stability of chitosan by grafting, a stability that increases even more by cross-linking.
  • DSC analysis demonstrated the thermoreversibility of polymer films characterized by the appearance of the endothermic peak on the heating curve.
  • Optimal conditions were found to highlight thermal regeneration over several heating cycles in the case of model compound.
  • All the result indicators foreseen in the "project implementation plan" were achieved: 1 paper sent to be published in a journal Q1 or Q2; 3 participations in scientific events.
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