Study On Preparation And Properties Of Triphenylamino Conjugated Microporous Polymer

Conjugated microporous polymer（CMPs）is a class of amorphous materials withπ-conjugated skeleton and porous structure,and its specific surface area is adjustable with large pore size,and its chemical stability is good.Therefore,CMPs materials are widely used in gas adsorption and storage,heterogeneous catalysis,Chemical sensors,phototrapping and excitation,electric energy storage and so on.In this paper,friedel-crafts alkylation reaction under the catalytic action of Mesonic acid,Two kinds of conjugated microporous polymers were synthesized by using different structure monomers.TTPB was synthesized by the combination of TCT and TPB,and TTPPA was synthesized by oxidative coupling polymerization.Under the catalysis of anhydrous ferric chloride,Two conjugated microporous polymers,PTPATTh and PTPATCz,were synthesized by[4-thiophenyl]phenyl amine patth and tri-4-carbazolyl amine respectively.The chemical composition and structure of conjugated microporous polymers were analyzed by Fourier transform infrared spectroscopy（FTIR）and nuclear magnetic resonance spectroscopy（NMR）.The results show that the structure of conjugated microporous polymer is composed of trianiline core structure and-C=N-.The morphology of conjugated microporous polymer is characterized by scanning electron microscopy（SEM）.The results show that both TTPB and TTPPA are hard block morphologies with metallic gloss.The thermal stability of conjugated microporous polymers is measured by thermogravimetric analysis（TGA）.The results show that all of the conjugated microporous polymers have good thermal stability.The decomposition temperatures of TTPB and TTPPA are over 500℃and 566℃,respectively,at 420℃and 566℃.The pore properties of porous polymers were analyzed.The results show that the typical type II desorption isotherms of type II N₂ are present in TTPB,which are the isotherms of type IV PTPATTh and PTPATCz.The pore sizes of several conjugated microporous polymers are analyzed.The adsorption of iodine vapor on conjugated microporous polymers TTPB and TTPA was measured at 350k and normal atmospheric pressure.The result shows that the iodine adsorption amounts of the two polymers are up to 4.43 g g^-1 and 4.90 g g^-1,which is the maximum reported amount of iodine adsorption so far.The fluorescence properties of the four conjugated microporous polymers were studied,and the PA/NP was detected selectively.The detection limits of NP and pa in DOX solvent by TTPB were 4.64×10^-10 and 8.14×10^-9 molL^-1,respectively.The detection limit of NP for TTPPA by THF is 6.32×10^-10molL^-1.The detection limits of PTPATTh for PA in DOX and THF solvents were 6.39×10^-8molL^-11 and 1.31×10^-9molL^-1,respectively.In DOX and THF solvents,the detection limits of PTPATCz for PA were 3.00×10^-9molL^-1 and7.01×10^-9 molL^-1,respectively.