疏水纤维素/SiO2复合气凝胶的制备和表征

生物质化学工程 ›› 2016, Vol. 50 ›› Issue (2): 39-44.

疏水纤维素/SiO₂复合气凝胶的制备和表征

刘昕昕, 刘志明

东北林业大学材料科学与工程学院, 黑龙江哈尔滨 150040

收稿日期:2015-10-23 出版日期:2016-03-30 发布日期:2016-03-31
通讯作者: 刘志明,教授,博士,博士生导师,主要从事生物质材料化学、纤维素气凝胶和纳米纤维素、木质素及其复合功能材料研究;E-mail:zhimingliuwhy@126.com。 E-mail:zhimingliuwhy@126.com
作者简介:刘昕昕(1991-),女,内蒙古赤峰人,硕士生,主要从事纤维素气凝胶研究
基金资助:
林业公益性行业科研专项(201504602);黑龙江省自然科学基金项目(C2015055);中央高校基本科研业务费专项资金资助项目(2572014EB01-02)

Preparation and Characterization of Hydrophobic Cellulose/SiO₂ Composite Aerogel

LIU Xin-xin, LIU Zhi-ming

College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China

Received:2015-10-23 Online:2016-03-30 Published:2016-03-31

摘要/Abstract

摘要： 以微晶纤维素和正硅酸乙酯(TEOS)为原料,通过溶胶-凝胶法制备了4种再生纤维素/SiO₂复合气凝胶,并利用十八烷基三氯硅烷(OTS)对复合气凝胶进行疏水改性,利用X射线衍射(XRD)、能谱仪(EDS)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)等对4种再生纤维素/SiO₂复合气凝胶及其疏水改性产物进行表征分析。结果表明:4种再生纤维素/SiO₂复合气凝胶均为白色固体,密度范围43.6~50.7 mg/cm³;XRD、EDS和FT-IR分析表明4种再生纤维素/SiO₂复合气凝胶中均含有硅元素,疏水纤维素/SiO₂复合气凝胶中均含有硅、氯元素;SEM分析表明4种再生纤维素/SiO₂复合气凝胶及其改性产物均呈现三维网状结构,改性产物的三维网状结构的孔隙变小。疏水纤维素/SiO₂复合气凝胶的接触角测试结果表明,4种样品接触角均大于90°,达到疏水状态,且随着TEOS用量的增加,接触角逐渐增大(最大接触角144.5°),疏水性能提高。

关键词: 微晶纤维素, 二氧化硅, 气凝胶, 疏水改性

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

中图分类号:

TQ352
O636

刘昕昕, 刘志明. 疏水纤维素/SiO₂复合气凝胶的制备和表征[J]. 生物质化学工程, 2016, 50(2): 39-44.

LIU Xin-xin, LIU Zhi-ming. Preparation and Characterization of Hydrophobic Cellulose/SiO₂ Composite Aerogel[J]. bce, 2016, 50(2): 39-44.

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疏水纤维素/SiO₂复合气凝胶的制备和表征

Preparation and Characterization of Hydrophobic Cellulose/SiO₂ Composite Aerogel

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