高校化学工程学报2018，Vol.32Issue(1)：208-214,7.DOI:10.3969/j.issn.1003-9015.2018.01.028
乙酰化纳米纤维素纤维的制备及其凝胶机制研究
Preparation of Acetylated Cellulose Nanofibrils and its Gelation Behavior
摘要
Abstract
Cellulose nanofibrils (CNF) have found application in biomedicine, food and other industries due to its biocompatibility, biodegradability and unique mechanical properties. However, CNFs are prone to aggregate in aqueous solutions, which leads to phase separation. It is necessary to adjust aggregation properties of CNF by chemical modification. Acetylated cellulose nanofibrils (ACNF) from microcrystalline cellulose were prepared by pressure homogenization in a non-organic solvent system. Effects of temperature and salt on mechanical properties and microstructure of the ACNF gel were investigated by rheometer, CLSM and SAXS. The results show that the ACNF particles are amorphous and have curved shape. The strength of the ACNF gel decreases first and then sharply increases with the increase of temperature. Moreover, the addition of salt is helpful to increase gel strength but decrease thermosensitivity. It is assumed that ACNF gelation is based on fibril entanglement driven by thermal motion when there is no salt. Salt addition triggers an abrupt density fluctuation which results in local aggregation that forms gel.关键词
乙酰化/纳米纤维素纤维/流变/缠结/凝胶特性Key words
acetylation/cellulose nanofibrils/rheology/entanglement/gelation properties分类
化学化工引用本文复制引用
李英豪,耿延训,徐化能..乙酰化纳米纤维素纤维的制备及其凝胶机制研究[J].高校化学工程学报,2018,32(1):208-214,7.基金项目
国家自然科学基金(21576116). （21576116）
