CHARACTERIZATION OF NANOCRYSTALLINE CELLULOSE ISOLATED FROM KRAFT PULP AND ITS APPLICATION IN PULP STRENGTHENING
Cellulose is the most abundant material in the biosphere. Acid hydrolysis of cellulose fibers yields an aqueous suspension of nanocrystals, which furthers its use in a vast range of materials. While much work has been done on its application as filler in nanocomposite, its application in pulp and paper has seldom been reported. In the present study, nanocrystalline cellulose (NCC) was isolated from the bleached hardwood kraft pulp and then characterized by X-ray diffraction (XRD), particle charge detector (PCD), atomic force microscopy (AFM) and polarized light microscopy. Its potential use as a pulp strengthening additive was also investigated. The results demonstrated that reaction temperature and acid pulp ratio had a significant influence on the nature and yield of NCC. NCC with high crystallinity (more than 80％) and a yield between 23 and 34％ could be extracted using 64wt ％ sulfuric acid at 40-60℃. When suspensions of NCC in water were allowed to evaporate on a flat surface, a film with typical optical properties was formed. The film reflected circularly polarized light and color changed with viewing angle, when observed in polarized light microscope. The NCCs were parallelepiped rod-like structures with cross-sectional dimensions in the nanometer range. When these NCCs were applied in the papermaking as pulp strengthening agent, the physical properties including breaking length and tear index increased.
nanocrystalline cellulose acid hydrolysis breaking length tear index
Wu Kaili Xu Qinghua Tan Liping Qin Menghua
Key Lab of Paper Science and Technology of Ministry of Education, Shandong Institute of Light Industry,Jinan, 250353, China
国际会议
广州
英文
1515-1518
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）