Synthesis And Properties Of Nanoporous Organic Polymers Based On1,3,5-triazine Framework

Recently, microporous organic polymers with molecular or nanoscale level of open porous channels, excellent porous properties, high thermal and chemical stability and large specific surface area become the research focus, because of their potential applications in catalyst carriers, gas separation, gas adsorption and photoelectric material, etc. It is currently essential to solve the problems that it is difficult to achieve the industriation of microporous organic polymers. Herein cheap commercially available materials are used to synthesis a series of novel organic skeleton materials based on1,3,5-triazine units, and their properties are deeply investigated through new methods.Firstly, direct polymerization to NOPs with BET specific surface area up to894m2·g-1was generated by Friedel-Crafts reaction using cyanuric chloride and triphenylamine as inexpensive monomers at Lewis acid condition. The results revealed that the material exhibits exceptional CO2capacities of57cm3/g (273K and1.0bar), while N2is2.1cm3/g. Besides, it has high separation performance of CO2-N2mixed system (selective separation coefficient up to27.)Then, the three-dimensional structure of organic skeleton microporous polymers, with BET specific surface area up to720m2·g-1, are synthesized by Friedel-Crafts reaction between tetrahedron structure of tetraphenylmethane and cyanuric chloride. The results showed that it has high gas (such as CO2, H2) adsorption and adsorption capacities are50cm3/g (77K/lbar) and29cm3/g (lbar/273k), respectively.The material exhibits potential applications in gas adsorption and separation.Lastly, nanoporous organic polymer based on benzoxazole units has been designed and synthesized. BET specific surface of the polymer is9.7m2/g. The introductions of oxygen and nitrogen heteroatoms into framework are perceived as an effective method to improve the isosteric heats of gas adsorption. Though the BET specific surface of polymer is low, it has relatively high CO2adsorption capacity (up to19cm3/g). Hope to the material get better applications in gas adsorption.