title: Improved refining properties of pulps pretreated with ionic liquids under mild conditions.
abstract: Imidazolium-based ionic liquids (ILs), including 1-butyl-3-methylimidazolium chloride (BmimCl) and 1-allyl-3-methylimidazolium chloride (AmimCl), were used to improve the refining properties of pulps under mild conditions. Results showed that the macro appearance of pulps was virtually unchanged after pretreatment with ILs under mild conditions. In addition, chemical pulps pretreated with ILs are more suitable for pretreatment than chemimechanical pulps. Pretreatment with ILs facilitates the refining process by destroying hydrogen bonds, which exist extensively in fiber. At the same refining energy input, the Canada standard freeness (CSF) of refined pulp decreased with improved fiber quality. At identical CSF values, the energy consumed during refining significantly decreased because ILs pretreatment facilitated swelling and fibrillation. The viscosity of cellulose changed slightly after IL pretreatment. However, the crystallinity index and fines content decreased, and the micro appearance of the fiber surface changed. BmimCl has a stronger swelling influence on pulp than AmimCl under optimal conditions.
authors.affiliation: Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education, Shandong Polytechnic University, Jinan, Shandong 250353, PR China. zhiqiang8505@126.com
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Pang
authors.forename: Jiachuan
authors.initials: J
authors.lastname: Chen
authors.forename: Cuihua
authors.initials: C
authors.lastname: Dong
authors.forename: Guihua
authors.initials: G
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
mesh_terms: D052578:Ionic Liquids / Q000737:chemistry*; D008422:Materials Testing; D010209:Paper; D010936:Plant Extracts / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*
chemical_list: D052578:Ionic Liquids; D010936:Plant Extracts