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Flame Retardant-Functionalized Cotton Cellulose Using Phosphonate-Based Ionic Liquids.

Karen Al Hokayem1,2, Roland El Hage2, Lenka Svecova3

  • 1Polymers Composites and Hybrids(PCH), IMT Mines Alès, 6, avenue de Clavières, 30100 Alès, France.

Molecules (Basel, Switzerland)
|April 8, 2020
PubMed
Summary

Functionalized cellulose using phosphonate ionic liquids (ILs) enhances flame retardancy. This modification significantly reduces heat release and increases char formation, creating safer cellulosic materials.

Keywords:
cellulose dissolutionflame retardancyphosphonate-based ionic liquidregeneration

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Green Chemistry

Background:

  • Cellulose, a renewable polymer, is widely used but lacks inherent flame retardancy.
  • Developing sustainable flame-retardant materials is crucial for safety and environmental concerns.

Purpose of the Study:

  • To functionalize cellulose using phosphonate-based ionic liquids (ILs).
  • To investigate the flame-retardant properties of modified cellulose.
  • To explore the potential for creating advanced flame-retardant cellulosic materials.

Main Methods:

  • Cellulose functionalization via dissolution-regeneration with specific phosphonate ILs ([DIMIM][(MeO)(H)PO2] and [EMIM][(MeO)(H)PO2]).
  • Chemical modification through transesterification reaction.
  • Characterization using X-ray diffraction, ICP-AES, and NMR spectroscopy (¹³C, ³¹P).
  • Evaluation of rheological behavior and microscale fire performance.

Main Results:

  • Successful grafting of phosphorus onto cellulose, with up to 4.5% phosphorus content achieved.
  • Regenerated cellulose exhibited significantly improved flame retardancy.
  • Total Heat Release (THR) values reduced to 5-6 kJ/g.
  • Char yield increased to approximately 35 wt%.

Conclusions:

  • Phosphonate ionic liquids effectively functionalize cellulose, imparting flame retardancy.
  • The modified cellulose demonstrates enhanced fire performance, suitable for flame-retardant applications.
  • This method offers a sustainable route to producing safer cellulosic materials.