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

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 degrees C for 4h. 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 0.67mol/L exhibited relatively high CO2 adsorption capacity under dry conditions (2.30mmol(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. [GRAPHICS] . HighlightsAmine-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.