期刊
CARBOHYDRATE POLYMERS
卷 203, 期 -, 页码 238-245出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.09.036
关键词
Bleached chemi-thermomechanical pulp; 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO); Carboxylate; Lignin; Cellulose nanofibers; Cement
资金
- Collaborative Research and Development Grant (CRD) under Canada's Natural Sciences and Engineering Research Council (NSERC) through Millar Western Forest Products
- Lehigh Hanson Canada
- Alberta Innovates Bio-Solutions
- Canada Foundation for Innovation (CFI)
- NSERC
Hardwood bleached chemi-thermomechanical pulp (BCTMP) was converted to cellulose nanofibers by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) catalyzed oxidization along with mechanical defibrillation process. The TEMPO reaction was evaluated based on the delignification, carboxylate content of cellulose and the yield of the insoluble component. Cellulose nanofibers were characterized by conductometry, Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM), thermogravimetric analysis (TGA) as well as X-ray diffraction (XRD) techniques. Minimum 10 mmol/g NaClO addition was needed to obtain meaningful carboxylate content and easy defibrillation by using high shear mixing. TEMPO-catalyzed oxidization process removed 74% of pentosans and 80% of lignin from bleached chemi-thermomechanical hardwood pulp while 13% of cellulose was also lost. CNF with 1.44 mmol/g carboxylate content resulted high level of water retention (13.4 g/g fiber) Cellulose nanofibers were used in cementitious mixtures. CNF with carboxyl groups resulted in better flow control in wet cement paste and reduced the crack growth in concrete.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据