Polyphenylenes with Phen-1,3,5-triyl Branching Moieties Based on p-Diacetylbenzene: Synthesis and Study of Porosity and Heat Resistance

Microporous three-dimensional polyphenylenes with phentriyl branching moieties are synthesized by the trimerization polycyclocondensation of p-diacetylbenzene followed by additional heat treatment at 450°C. The structure of the polymers is studied by IR spectroscopy and the methods of thermal desorption of argon and low-temperature sorption of nitrogen. The volume of micropores amounts to more than 70% of the total pore volume. Calculations of the parameters of the microporous structure using the Dubinin–Radushkevich and Dubinin–Astakhov methods show that the average micropore size in the test sample is 1 nm. The surface of all pores, as calculated by various methods, is in the range from 470 to 980 m2/g. According to the TGA data, the polymer shows high heat resistance: when heated in an inert medium, its mass losses does not exceed 20% in the range of 200–900°C.