期刊
CELLULOSE
卷 20, 期 6, 页码 2935-2945出版社
SPRINGER
DOI: 10.1007/s10570-013-0062-9
关键词
Nanocellulose; TEMPO oxidation; In situ nanoparticles; Hydrophobicity
资金
- United States Department of Agriculture National Institute of Food and Agriculture (USDA NIFA) [2010-65504-20429]
- USDA NIFA [2010-34489-20784]
- Virginia Tech's Interdisciplinary Graduate Education Program for Sustainable Nanotechnology
- NIFA [580955, 2010-34489-20784] Funding Source: Federal RePORTER
Handsheets with in situ generated cellulose nanoparticles were made from oxidized pulp fibers prepared by 2,2,6,6-tetramethylpiperidinyl-1-oxyl-mediated oxidation of kraft fiber with sodium hypochlorite and sodium bromide. The oxidized pulp fibers were blended prior to handsheet formation for short times (1-3 min). From gravimetric analysis of the supernatant, yield of cellulose nanoparticles generated from this blending process were up to 9.5 dry wt%. Scanning electron microscopy showed that the handsheets fabricated in a wetlay process had increased smoothness with increased blending time. A significant decrease in water vapor transmission rate for the sheets supported the hypothesis that cellulose nanoparticles fill the empty spaces between pulp fibers throughout the handsheet affording a more dense structure. Oxidation significantly enhanced the tensile index of the handsheets and this value was further improved by blending for 2 min. The handsheets were treated with a solution of octadecylamine (ODA) modifying the surface chemistry of the paper. Irreversibly adsorbed ODA on the oxidized cellulose surfaces after extensive extraction was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Sessile drop contact angle tests for modified handsheets illustrated its enhanced hydrophobicity with contact angles over 90A degrees. Overall the study developed a novel route to make paper with enhanced functionality without the need to separately deposit nanocellulose onto the paper surface.
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