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/Si O2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/Si O2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/Si O2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/Si O2复合气凝胶中均含有硅元素,疏水纤维素/Si O2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/Si O2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/Si O2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。
Four kinds of regenerated cellulose / Si O2 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（ FTIR） and scanning electron microscopy（ SEM）,respectively. The results showed that all the regenerated cellulose / Si O2 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 / Si O2 composite aerogels,and both silicon and chlorine element appeared in the hydrophobic cellulose / Si O2 composite aerogels. SEM analysis results showed that the structure of the regenerated cellulose / Si O2 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 / Si O2 composite aerogels were more than 90°,and hydrophobic state was reached. Contact angle was gradually increased with the increase of Si O2 content,and the biggest contact angle was 144. 5°. Hydrophobic property of hydrophobic cellulose / Si O2 composite aerogels were improved.
出处
《生物质化学工程》
CAS
北大核心
2016年第2期39-44,共6页
Biomass Chemical Engineering
基金
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)
关键词
微晶纤维素
二氧化硅
气凝胶
疏水改性
microcrystalline cellulose
SiO2
aerogel
hydrophobic modification
