Preparation of CO2-adsorbable amine-functionalized polysilsesquioxanes containing cross-linked structures without using surfactants and strong acid or base catalysts.

Autor: Sainohira, Yusaku, Fujino, Koki, Shimojima, Atsushi, Kuroda, Kazuyuki, Kaneko, Yoshiro
Zdroj: Journal of Sol-Gel Science & Technology; Sep2019, Vol. 91 Issue 3, p505-513, 9p
Abstrakt: In this study, we prepared a series of amine-functionalized polysilsesquioxanes (PSQs) containing cross-linked structures via the hydrolytic condensation of mixtures of amino-group-containing organotrialkoxysilanes and bridged organoalkoxysilanes in water under CO2 gas bubbling, followed by lyophilization and heat treatment at 120 °C for 4 h. Among the resulting materials, the amine-functionalized PSQ (PSQ-Am-CL-0.67) prepared from a mixture of 3-aminopropyltrimethoxysilane and bis[3-(trimethoxysilyl)propyl]amine (molar ratio 1:1) as the starting materials in CO2-gas-bubbling water with a solution concentration of 0.67 mol/L exhibited relatively high CO2 adsorption capacity under dry conditions (2.30 mmol(CO2)/g(material)). Moreover, even after repeating the adsorption and desorption of CO2 10 times, the CO2 adsorption capacity of PSQ-Am-CL-0.67 did not noticeably reduce, indicating that it could be used repeatedly as a CO2 capture material. Highlights: Amine-functionalized polysilsesquioxanes (PSQs) containing cross-linked structures were prepared. The resulting PSQs exhibited a relatively high CO2 adsorption capacity under dry conditions. The resulting PSQs can be used repeatedly as CO2 capture materials. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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