The influence of ionic liquid concentration on microcrystalline cellulose modification

被引：14

作者：

Kerche, Eduardo Fischer ^{[1
]}

Neves, Roberta Motta ^{[1
]}

Ornaghi, Heitor Luiz ^{[2
]}

Zattera, Ademir Jose ^{[3
]}

Schrekker, Henri Stephan ^{[4
]}

机构：

[1] Fed Univ Rio Grande Sul UFRGS, PPGE3M, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS, Brazil

[2] Univ Fed Integracao Amer Latina UNILA, Av Silvio Amer Sasdelli 1842, BR-85866000 Foz Do Iguacu, PR, Brazil

[3] Univ Caxias Sul UCS, PGEPROTEC, Rua Francisco Getalio Vargas 1130, BR-95070560 Caxias Do Sul, RS, Brazil

[4] Fed Univ Rio Grande Sul UFRGS, Lab Technol Proc & Catalysis, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS, Brazil

来源：

CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS | 2022年 / 3卷

关键词：

Imidazolium ionic liquid; Microcrystalline cellulose; Surface treatment; Thermal degradation kinetics; THERMAL-DECOMPOSITION KINETICS; MECHANISM; FIBERS; SALTS;

D O I：

10.1016/j.carpta.2022.100211

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Ethanolic ionic liquid (IL) solutions, containing different 1-n-butyl-3-methylimidazolium chloride (C(4)MImCl) concentrations were used to modify the surface of commercial microcrystalline cellulose (MCC). The chosen ratios were: 4, 8, 16, and 32 wt.% of IL, in relation to the MCC mass. These treatments with IL did not affect the MCC morphology. FTIR analysis showed the characteristic bands of C(4)MImCl when the IL concentration was higher than 4 wt.%. XRD diffractograms show that the crystals may have been disrupted for IL concentrations above 4 wt.%. H-1 NMR confirmed the formation of strong hydrogen bonds between C(4)MImCl and MCC, especially for MCC treated with 4 wt.% of IL. The functionalization using IL, regardless of the content, showed two DTG peaks, without altering the MCC Arrhenius' parameters and degradation mechanisms. 4 wt.% of C(4)MImCl proved to be suitable for the MCC surface modification, improving thermal stability without detrimental effects on MCC morphology.

引用

页数：10

共 40 条

[1] Solvent-free acetylation of cellulose nanofibers for improving compatibility and dispersion [J].