The extra free volume of glassy, highly permeable 1,2-disubstituted polyacetylenes is associated with the microporous organization of these polymers. In this work, the microporosity of poly(1-trimethylsilyl-1-propyne) (PTMSP) and poly(4-methyl-2-pentyne) (PMP) is investigated by two independent methods—convenient low-temperature Ar sorption and less commonly used small-angle X-ray scattering (SAXS). The Ar sorption data were analyzed in connection with the specific surface area, pore volume, and micropore size distribution. It is shown that the higher specific surface area, total pore volume, and micropore volume of PTMSP than those of PMP are associated with higher gas permeability coefficients. It was found that the Brunauer–Emmett–Teller-specific surface values obtained for PTMSP and PMP from argon sorption isotherms correlate with the specific surface values obtained from the SAXS method. The correlation of the specific surface values obtained from fundamentally different methods makes it possible to evaluate the small-angle scattering method as adequate for assessing the microporosity of polymeric materials.
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Synthesis of monomers and polymers, characterization of polymers, low-temperature sorption, and gas permeability experiments for this paper were financially supported by the Russian Science Foundation (Project No. 18–13–00334). The SAXS studies were carried out on the unique scientific equipment Kurchatov Synchrotron Radiation source of the National Research Center “Kurchatov Institute” under the program of providing services.
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Matson, S.M., Zhilyaeva, N.A., Bakirov, A.V. et al. Investigation of the microporous organization of 1,2-disubstituted polyacetylenes using low-temperature argon sorption and small-angle X-ray scattering. Polym J 53, 449–454 (2021). https://doi.org/10.1038/s41428-020-00437-z