Preparation of CO2-adsorbable amine-functionalized polysilsesquioxanes containing cross-linked structures without using surfactants and strong acid or base catalysts
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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.
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.
KeywordsPolysilsesquioxane Hydrolytic condensation Carbon dioxide adsorption Porous material
This work was partly carried out at the Joint Research Center for Environmentally Conscious Technologies in Materials Science (project No. 30003) at ZAIKEN, Waseda University.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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