气凝胶
热重分析
傅里叶变换红外光谱
纳米纤维素
材料科学
聚乙烯醇
吸水率
接触角
纤维素
吸收(声学)
聚合物
复合材料
化学工程
有机化学
化学
工程类
作者
Boyuan Chen,Hui Zhang,Lijuan Li,Yingcheng Hu
出处
期刊:ACS applied polymer materials
[American Chemical Society]
日期:2023-04-20
卷期号:5 (5): 3554-3563
被引量:10
标识
DOI:10.1021/acsapm.3c00188
摘要
Nano-cellulose aerogels have low densities, high porosities, and strong absorption capacities, making them suitable for cleaning up oil and chemical spills in oceans. However, their weak lipophilicity and poor mechanical properties often limit their applications. We attempted to introduce long-chain polymers on the nanocellulose/polyvinyl alcohol (CNF/PVA) surface for the hydrophobic modification of aerogels. In this paper, PVA/CNF was silylated by introducing hydrolyzed ethyltrimethoxysilane to increase its hydrophobicity. Aerogels with interpenetrating pore structures were prepared by a directional freezing method. The aerogels had a high strength in the freezing direction and high compressive elasticity in the direction perpendicular to the freezing direction. Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and water contact angle (148°) tests demonstrated the successful silylation of the aerogel surface. The aerogel absorbed oil and some organic solvents 50–110 times higher than its own weight. It showed good reusability, with an absorption loss rate of 20% after 40 squeezing cycles. This green and sustainable method is inexpensive and has a short production cycle. In addition, the absorption of alcohols and lipids by aerogels can be used as a carrier for surgical drugs.
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