Preparation And Gas Storage Of Conjugated Porous Organic Polymers

Increasing carbon dioxide concentration in the atmosphere mainly caused by the rapid consumption of fossil fuels has partly led to the global climate change and some environmental issues, which have drawn great attentions and concerns. Therefore, carbon dioxide capture and utilizing clean energy source, such as hydrogen, are of interest to meet the energy and environmental demands. As a response, big efforts have been devoted to explore suitable materials for carbon dioxide capture or hydrogen storage. Microporous organic polymers with the intrinsic properties including large specific surface area, narrow pore size distribution, high chemical stability, and low skeleton density, have exhibited potential applications in gas storage and separation. In this thesis, a series of porous organic polymers were prepared, and the applications of them were also investigated.Hexaphenylbenzene-based porous organic homopolymers are prepared smoothly through palladium-catalyzed coupling polymerization. According to the obtained nitrogen physisorption isotherms, the Brunauer-Emmett-Teller specific surface area forthese polymers varies between720and1147m2g-1. Gravimetric hydrogen adsorption isotherms show that the adsorption capacity for hydrogen is up to1.46wt%at1.0bar and77K. Hexaphenylbenzene-based porous organic copolymers with Brunauer-Emmett-Teller specific surface area varying between734and924m2g-1were synthesized by the Pd-catalyzed Suzuki-Miyaura coupling polycondensation reaction. Their gas adsorption capacities were measured based on the obtained gas physisorption isotherms. The hydrogen uptake of HPOP-4is1.23wt%at1.0bar and77K, and the carbon dioxide uptaking is up to9.01wt%at1.0bar and273K.Organic porous material CPOP-1is prepared by carbazole-based oxidative coupling polymerization, whose Brunauer-Emmett-Teller specific surface area is up to2220m2g-1. Gravimetric gas adsorption isotherms show that the hydrogen storage can reach to2.80wt%at1.0bar and77K and uptake capacity for carbon dioxide is up to21.2wt%at1.0bar and273K, which exhibit potential use for clean energy applications and environmental sciences. Furthermore, the high selectivity for carbon dioxide over nitrigen and methane makes it have potential use in gas separation applications. A series of microporous polycarbazoles were also prepared by the same way, which own high Brunauer-Emmett-Teller specific surface area, good gas uptake capacity, and fluorescence properties.Xanthene-based microporous polymeric spheres are prepared through palladium-catalyzed coupling polymerization. The Brunauer-Emmett-Teller specific surface area for PSBX-1is705m2g-1. Gravimetric gas adsorption isotherms show that the hydrogen storage can reach1.10wt%at1.0bar and77K, and uptake capacity for carbon dioxide is up to8.50wt%at1.0bar and273K.