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

Molecules

Roland El Hage¹  Belkacem Otazaghine²  Nicolas Le Moigne²  Rodolphe Sonnier²  Karen Al Hokayem²  Lenka Svecova³ 

[1] LCPM, Faculty of Sciences, Lebanese University, Campus Fanar P.O.B. 90656, Lebanon;Polymers Composites and Hybrids(PCH), IMT Mines Alès, 6, avenue de Clavières, 30100 Alès, France;Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, LEPMI, 38000 Grenoble, France;

关键词: phosphonate-based ionic liquid;    flame retardancy;    cellulose dissolution;    regeneration;   

DOI  :  10.3390/molecules25071629

来源: DOAJ

【 摘 要 】

Cellulose from cotton fibers was functionalized through a dissolution–regeneration process with phosphonate-based ionic liquids (ILs): 1,3-dimethylimidazolium methylphosphonate [DIMIM][(MeO)(H)PO₂] and 1-ethyl-3-methylimidazolium methylphoshonate [EMIM][(MeO)(H)PO₂]. The chemical modification of cellulose occurred through a transesterification reaction between the methyl phosphonate function of ILs and the primary alcohol functions of cellulose. The resulting cellulose structure and the amount of grafted phosphorus were then investigated by X-ray diffraction, ICP-AES, and ¹³C and ³¹P NMR spectroscopy. Depending on the IL type and initial cotton / IL ratio in the solution, regenerated cellulose contained up to 4.5% of phosphorus. The rheological behavior of cotton cellulose/ILs solutions and the microscale fire performances of modified cellulose were studied in order to ultimately prepare flame retardant cellulosic materials. Significant improvement in the flame retardancy of regenerated cellulose was obtained with a reduction of THR values down to about 5–6 kJ/g and an increase of char up to about 35 wt%.

【 授权许可】

Unknown