关键词: 离子液体, 微晶纤维素, 溶解率, 结晶度, 聚合度, 再生纤维素

Abstract:

Abstract: Ionic liquid of 1-allyl-3-ethyl imidazolium chloride ([AEIM]Cl) had been synthesized using N-ethylimidazole and chloro-propene. The chemical structure of [AEIM]Cl was confirmed by FT-IR and 1HNMR. The solubility of [AEIM]Cl for microcrystalline cellulose (MCC) was studied by microwave heating method. Influences of pretreatment methods for MCC, such as NaOH, microwave and high pressure, on crystallinity, degree of polymerization (DP) and dissolution rate were studied. Chemical structure, change of crystal form, thermostability and appearance of the regenerated cellulose after dissolved were analyzed by FT-IR, XRD, TGA and SEM respectively. It showed that synthesis ionic liquid was the object product, which exhibited a very good soluble ability for MCC. Crystallinity of MCC was the smallest, DP was the lowest and dissolution rate was the highest on the condition of MCC pretreated with high pressure pot and 15% NaOH (mass fraction). Chemical reaction of MCC didn’t occur during the soluble process. The crystallinity of the regenerated cellulose decreased, and the thermostability declined.

Key words: ionic liquid, microcrystalline cellulose, dissolution rate, crystallinity, degree of polymerization, regenerated cellulose