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bce ›› 2016, Vol. 50 ›› Issue (2): 39-44.

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Preparation and Characterization of Hydrophobic Cellulose/SiO2 Composite Aerogel

LIU Xin-xin, LIU Zhi-ming   

  1. College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2015-10-23 Online:2016-03-30 Published:2016-03-31

Abstract: Four kinds of regenerated cellulose/SiO2 composite aerogels were prepared by sol-gel method with microcrystalline cellulose and tetraethoxysilane (TEOS) as raw materials and hydrophobically modified with octadecyl trichlorosilane (OTS).All samples were characterized by X-ray diffraction (XRD), energy spectrum (EDS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively.The results showed that all the regenerated cellulose/SiO2 composite aerogels were white solid and the densities were in the range of 43.6-50.7 mg/cm3. XRD, EDS and FT-IR analysis results showed that silicon element appeared in the regenerated cellulose/SiO2 composite aerogels, and both silicon and chlorine element appeared in the hydrophobic cellulose/SiO2 composite aerogels. SEM analysis results showed that the structure of the regenerated cellulose/SiO2 composite aerogels and the modified products were all three-dimensional network, and the pore became smaller after modification. The contact angel test showed that the contact angels of four kinds of hydrophobic cellulose/SiO2 composite aerogels were more than 90°, and hydrophobic state was reached.Contact angle was gradually increased with the increase of SiO2 content, and the biggest contact angle was 144.5°.Hydrophobic property of hydrophobic cellulose/SiO2 composite aerogels were improved .

Key words: microcrystalline cellulose, SiO2, aerogel, hydrophobic modification

CLC Number: