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• W2046952258 abstract "The microporous molecular networks based on rigid tetrafunctional units are synthesized via organic sol–gel polymerization of 2,2′,7,7′-tetraamino-9,9′-spirobifluorene (TASBF) and/or tetrakis(4-aminophenyl)methane (TAPM) with a diisocyanate, hexamethylene diisocyanate (HDI), or p-phenylene diisocyanate. This study is performed as an extension of our previous report on the first organic sol–gel method, which enabled the synthesis of microporous molecular networks via a two-stage mechanism involving the formation of colloidal dispersions of the nanoparticulate molecular networks and their subsequent growth to monolithic networks on solvent evaporation. The sol–gel-synthesized molecular networks obtained by incorporating TASBF as a network former show improved porosity, processability, and thermal stability than the TAPM-based system. The improved porosity of TASBF-based networks is attributed to higher rigidity of the spirobifluorene compared with the tetraphenylmethane units. We also demonstrate the synthesis of mixed organic molecular networks by sol–gel copolymerization of the two network formers, TASBF and TAPM, and a diisocyanate monomer. The sol–gel transformation of TASBF/TAPM/HDI occurred at longer reaction times with increasing the amount of TASBF in the TASBF/TAPM/HDI mixture. The results indicate that the organic sol–gel method can be further optimized by adjusting various synthesis parameters to create new functional organic molecular network materials. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013" @default.
• W2046952258 created "2016-06-24" @default.
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• W2046952258 date "2013-01-28" @default.
• W2046952258 modified "2023-10-16" @default.
• W2046952258 title "Organic sol-gel synthesis of microporous molecular networks containing spirobifluorene and tetraphenylmethane nodes" @default.
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• W2046952258 doi "https://doi.org/10.1002/pola.26552" @default.
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