Cellulose-silicate composite aerogels from chemical gelation of cellulose via crosslinking by TEOS
Cellulose dissolved in 8% LiCl/dimethyl sulfoxide (LiCl/DMSO) via ethylenediamine (EDA) pretreatment was found to undergo reaction with tetraethyl orthosilicate (TEOS) at room temperature, forming transparent gels.This phenomenon apparently showed the TEOS undergo ester exchange with cellulose, and the multivalency of TEOS gave rise to crosslinking of dissolved cellulose.Several aspects of behavior of this system were consistent with this interpretation.The presence of trace EDA, arising from cellulose pretreatment, was essential for the reaction, probably acting as catalyst.Cellulose-silicate composite aerogels were prepared from these transparent gels after solvent exchange with ethanol followed by tert-butanol and freeze-drying.The aerogels were investigated by SEM, EDX and BET analysis (nitrogen gas adsorption).
Cellulose composite aerogel Organic silicate Crosslinking
Zhang Lili Si Yudan Liu Liang Wang Zhiguo Fan Yimin
Jiangsu Provincial Key Lab of Biomass-based Green Fuel & Chemicals, College of Chemical Engineering, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry Scien
国内会议
南京
英文
158-163
2015-10-17（万方平台首次上网日期，不代表论文的发表时间）