欢迎访问《生物质化学工程》,

生物质化学工程 ›› 2018, Vol. 52 ›› Issue (6): 15-22.doi: 10.3969/j.issn.1673-5854.2018.06.003

• 研究报告 • 上一篇    下一篇

球形纤维素纳米纤丝气凝胶的制备及性能表征

刘双, 张洋, 江华, 姚远, 王晓宇, 赵华   

  1. 南京林业大学 材料科学与工程学院, 江苏 南京 210037
  • 收稿日期:2017-09-22 出版日期:2018-11-30 发布日期:2018-12-12
  • 通讯作者: 张洋(1956-),男,教授,研究方向:木质复合材料;E-mail:yangzhang31@126.com。 E-mail:yangzhang31@126.com
  • 作者简介:刘双(1991-),男,河南信阳人,硕士,研究方向:生物质复合材料;E-mail:971334890@qq.com
  • 基金资助:
    林业公益性行业科研专项(201504603)

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

摘要: 以桉木纸浆为原料,制备了不同纤维素质量分数(1%、1.5%、2%和2.5%)的球形纤维素纳米纤丝(CNF)气凝胶。通过扫描电子显微镜(SEM)、全自动比表面积与孔隙度分析(BET)仪、傅里叶变换红外光谱(FT-IR)仪、组合型多功能水平X射线衍射(XRD)仪和热重分析(TG)仪等技术对制备的CNF气凝胶的进行表征。结果显示:制备的CNF气凝胶为球状,是一种具有三维网络结构的介孔材料,其密度为0.0248~0.0427 g/cm3,孔隙率≥97.33%,孔径≤19.4 nm。该气凝胶材料具有纳米纤维素的红外特征峰,其晶型结构仍然为纤维素Ⅰ型结构,且拥有良好的热稳定性,当CNF质量分数为2%时,气凝胶的最大失重速率温度(Tmax)为306.52 ℃。伴随着CNF质量分数的增加,CNF气凝胶的密度、孔隙率逐渐减小,孔体积、BET比表面积先增大后减小,孔径先减小后增大。

关键词: 纤维素纳米纤丝, 冷冻干燥, 球形纤维素气凝胶, 三维网络结构

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

中图分类号: