纤维素
离子液体
膦酸盐
再生纤维素
阻燃剂
溶解
化学
高分子化学
烧焦
纤维素纤维
材料科学
有机化学
化学工程
热解
催化作用
工程类
作者
Karen Al Hokayem,Roland El Hage,Lenka Švecová,Belkacem Otazaghine,Nicolas Le Moigne,Rodolphe Sonnier
出处
期刊:Molecules
[MDPI AG]
日期:2020-04-02
卷期号:25 (7): 1629-1629
被引量:19
标识
DOI:10.3390/molecules25071629
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%.
科研通智能强力驱动
Strongly Powered by AbleSci AI