Introduction of Ionic Liquids as Highly Efficient Plasticizers and Flame Retardants of Cellulose Triacetate Films
2022
Aghmih, Kaoutar | Boukhriss, Aicha | El Bouchti, Mehdi | Ait Chaoui, Mohammed | Majid, Sanaa | Gmouh, Said
As a promising biodegradable polymer, cellulose triacetate (CTA) was synthesized and plasticized with ionic liquids to produce flexible biocomposite films multi-end-use. Initially, CTA polymer was synthesized from industrial waste cotton using a heterogeneous pathway. Subsequently, four ionic liquids, namely 3-hexyl-1-methyl imidazolium acetate [C₆MIM][Ac], 3-hexyl-1-methyl imidazolium hexafluorophosphate [C₆MIM][PF₆], N-hexyl N,N,N-triethylammonium acetate [N₂₂₂₆][Ac] and N-hexyl N,N,N-triethylammonium hexafluorophosphate [N₂₂₂₆][PF₆] were synthesized and used as plasticizer materials of CTA film. Indeed, the films were prepared at room temperature using the solution-casting method, and the effects of ionic liquids on their morphological, mechanical, and thermal properties were evaluated. Morphological results indicated that the prepared films had smooth surfaces and high transparency. The addition of ionic liquids significantly reduced the crystallinity of CTA film and made it ductile. The Mechanical and thermal results showed that the ionic liquid anion has a significant effect on the properties of the film. CTA films plasticized with ionic liquids based on [PF₆]⁻ were more flexible than the others, with an elongation of 18.22% instead of 1.97%. The climate ageing test, on the other hand, confirmed that the used ILs could indeed maintain the plasticized state during aging with a better stability of the hydrophobic IL in the polymer matrix compared to the hydrophilic IL. There are self-extinguishing with a final residue of about 97 wt%, allowing CTA films to be used for thermal insulation and fire protection, as well as packaging applications.
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