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Highly selective TFC membrane based on poly(n-tetradecyl methyl siloxane) with hydrocarbon pressure-sensitive crystallinity and permeanceстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 сентября 2025 г.
- Авторы: Sokolov Stepan E., Volkov Vladimir V., Grushevenko Evgenia A., Borisov Ilya L., Shalygin Maxim G., Volkov Alexey V.
- Журнал: Journal of Membrane Science
- Том: 735
- Год издания: 2025
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 124528
- DOI: 10.1016/j.memsci.2025.124528
- Аннотация: membrane was discovered for the first time. A TFC membrane with selective layer based on semicrystalline comb-like poly(n-tetradecyl methyl siloxane) (PTDMS-PDMS) was fabricated. The separation of the ternary gas mixture C4H10(10 vol%)/C2H6(10 vol%)/CH4 and the binary gas mixtures C4H10(3–65 vol%)/CH4 were studied in the temperature range of -15 – 60 °C, including the polymer melting point (13.1 °C). Pure gas hydrocarbon sorption and diffusion in dense PTDMS-PDMS membrane were investigated by the gravimetric method in the pressure range up to 100 atm and at the temperatures of 5 and 25 °C. The PTDMS-PDMS transition from semicrystalline to an amorphous state was accompanied by a 3.1–3.7-fold hydrocarbon “permeance jump”. It is especially important that this transition could also be achieved by increasing the hydrocarbon concentration in the feed mixture. For instance, an increase in the butane partial pressure from 0.03 to 0.5 atm caused a 4-fold nonlinear growth in the butane and methane mixed gas permeances through TFC membrane measured at 5 °C. The gravimetric sorption analysis led to the conclusion that this effect was associated with the PTDMS-PDMS side-chain melting induced by hydrocarbon sorption. It was shown that the main contribution to the hydrocarbon pressure-sensitive permeance effect was made by the hydrocarbon diffusion, since C2H6 and C4H10 diffusivities jumped by ∼3 times during the hydrocarbon induced polymer melting. It was important to emphasize that the discovered effect had a positive impact on the transport properties of the TFC membrane. Thus, the hydrocarbon permeance increased fourfold, while the mixed gas selectivity of C4H10/CH4 remained constant at 20 (at 5 °C).
- Добавил в систему: Соколов Степан Евгеньевич