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bce ›› 2018, Vol. 52 ›› Issue (6): 15-22.doi: 10.3969/j.issn.1673-5854.2018.06.003

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Preparation and Performance of Spherical Cellulose Nanofibril Aerogels

LIU Shuang, ZHANG Yang, JIANG Hua, YAO Yuan, WANG Xiaoyu, ZHAO Hua   

  1. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2017-09-22 Online:2018-11-30 Published:2018-12-12

Abstract: Spherical cellulose nanofibril(CNF) aerogels with different CNF mass fraction(1%,1.5%,2% and 25%) were obtained with eucalyptus pulp as raw material. The resulting CNF aerogels were mainly characterized by scanning electron microscopy(SEM), automatic surface area and porosity analyzer(BET), Fourier transform infrared spectroscopy(FT-IR), combined multi-function horizontal X-ray diffraction(XRD) and thermogravimetric analyzer(TG). The results showed that the cellulose aerogels prepared in this experiment were spherical, the spherical CNF aerogels were mesoporous materials with three-dimensional network structure, and the densities were 0.024 8-0.042 7 g/cm3, porosity ≥ 97.33%, pore size ≤ 19.4 nm. The aerogels possessed the infrared characteristic peak of nanocellulose, and its crystal structure was still cellulose I type structure and had excellent thermal stability. When the CNF mass fraction was 2%, the maximum weight loss rate temperature(Tmax) was 306.52 ℃. With the increase of CNF mass fraction, the desity and porosity of CNF aerogels gradually decreased, the pore volume and BET specific surface area increased first and then decreased and the pore size decreased first and then increased.

Key words: cellulose nanofibril, freeze drying, spherical cellulose aerogels, three-dimensional network structure

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