| Autor: |
Anokhina TS; V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia., Ershova TO; N. Nesmeyanov Institute of Organoelement Compounds RAS, 119334 Moscow, Russia.; The Faculty of Natural Sciences, Tula State Lev Tolstoy Pedagogical University, 300026 Tula, Russia., Anisimov AA; N. Nesmeyanov Institute of Organoelement Compounds RAS, 119334 Moscow, Russia.; The Faculty of Natural Sciences, Tula State Lev Tolstoy Pedagogical University, 300026 Tula, Russia.; Moscow Institute of Physics and Technology, Faculty of Electronics, Photonics and Molecular Physics, National Research University, 141700 Dolgoprudny, Russia., Temnikov MN; N. Nesmeyanov Institute of Organoelement Compounds RAS, 119334 Moscow, Russia.; The Faculty of Natural Sciences, Tula State Lev Tolstoy Pedagogical University, 300026 Tula, Russia., Grushevenko EA; V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia., Borisov IL; V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia., Volkov AV; V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia., Muzafarov AM; N. Nesmeyanov Institute of Organoelement Compounds RAS, 119334 Moscow, Russia.; Enikolopov Institute of Synthetic Polymeric Materials RAS, 117393 Moscow, Russia. |
| Abstrakt: |
This paper presents the results of studies on the pervaporation properties (for benzene/hexane mixtures) and gas permeability (for He, H 2 , N 2 , O 2 , CO 2 , CH 4 , C 2 H 6 , and C 4 H 10 ) of ladder-like polyphenylsesquioxanes (L-PPSQ) with improved physical and chemical properties. These polymers were obtained by condensation of cis -tetraphenylcyclotetrasiloxanetetraol in ammonia medium. The structure of L-PPSQ was fully confirmed by a combination of physicochemical analysis methods: 1 H, 29 Si NMR, IR spectroscopy, HPLC, powder XRD, and viscometry in solution. For the first time, a high molecular weight of the polymer (Mn = 238 kDa, Mw = 540 kDa) was achieved, which determines its improved mechanical properties and high potential for use in membrane separation. Using TGA and mechanical analysis methods, it was found that this polymer has high thermal (T d 5% = 537 °C) and thermal-oxidative stability (T d 5% = 587 °C) and good mechanical properties (Young's module (E) = 1700 MPa, ultimate tensile stress (σ) = 44 MPa, elongation at break (ε) = 6%), which is important for making membranes workable under various conditions. The polymer showed a high separation factor for a mixture of 10% wt. benzene in n-hexane (126) at a benzene flow of 33 g/(m 2 h). |
