Strengthened cellulosic gels by the chemical gelation of cellulose via crosslinking with TEOS
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Physical and chemical gels of cellulose were obtained by (1) coagulation of dimethyl sulfoxide (LiCl/DMSO) cellulose solution in ethanol and (2) crosslinking by tetraethyl orthosilicate (TEOS) in non-aqueous medium under catalysis with ethylenediamine (EDA). Their structure and properties were studied. The highest storage modulus was 1.08 MPa (physical) and 4.04 MPa (chemical), respectively. The surface area (SBET) of cellulose chemical gels, which were composed of three-dimensional networks of long silica-modified fibrils, was as high as 296.8 m2/g. It is noticeable that it is not simple self-condensation of organic silicate that occurred but instead the ostensive silicic ester of cellulose was formed. This novel cellulose derivative and its chemical gelation may lead to a new category of cellulose-based organic–inorganic hybrid materials.
KeywordsCellulose hydrogel Chemical gelation Organic silicate Crosslinking
We are grateful for the financial support from project funding from the National Natural Science Foundation of China (Grant No. 31870565) as well as project funding from the Natural Science Foundation of Jiangsu Province (BK20181397), the Doctorate Fellowship Foundation of Nanjing Forestry University, the Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX17_0845) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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