New polycarbonate siloxanes based on siloxane-N-phthalimidines
| Autor: | D. O. Anashkin, I. M. Raigorodskii, A. D. Kirilin, P. A. Storozhenko |
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| Jazyk: | ruština |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Тонкие химические технологии, Vol 16, Iss 1, Pp 16-25 (2021) |
| Druh dokumentu: | article |
| ISSN: | 2410-6593 2686-7575 |
| DOI: | 10.32362/2410-6593-2021-16-1-16-25 |
| Popis: | Objectives. Polymeric carbonate siloxanes containing a siloxane-N-phthalimidine group in the chain frame are new synthetic comb-like macromolecule systems. This work aims to study the possibility of applying them in the form of film materials for heat-resistant, high-performance gas-permeable membranes.Methods. Comb-like polycarbonate siloxanes of the siloxane-containing polyether class were obtained using various polycondensation methods. i.e., by the polymer-analogous transformation of polycarbonate-allyl-N-phthalimidines, using their reaction in an alkyl hydride siloxane solution; polycondensation of N-(3-(pentamethyldisiloxane)-propyl)-3,3-bis-(4'-hydroxyphenyl)phthalimidine with diphenylolpropane bis-chloroformate in a solution using triethylamine as an acceptor of hydrochloric acid; interphase polycondensation of the above reagents in a dichloromethane aqueous alkali system. The structures of the obtained initial and polymeric compounds were confirmed by proton nuclear magnetic resonance spectroscopy and elemental analysis. All of the synthesized comb-like copolymers had good solubility in several available solvents and film formations.Results. The new comb-like polycarbonate siloxanes had high thermal stability. According to thermogravimetric analysis, the introduction of up to 20 wt % siloxane units makes it possible to increase the heat resistance of polycarbonate siloxanes by 25 °C. Concurrently, their glasstransition temperature reaches 160 °C. Copolymers of polycarbonate siloxanes in the form of films have a high tensile strength above 50 MPa and an elastic modulus of up to 2000 MPa. The permeability coefficients of gases through a copolymer of polycarbonate siloxanes in the form of a film for several gases surpass the permeability of industrial polycarbonate from diphenylolpropane and fluorine-containing siloxane polycarbonate.Conclusions. The results achieved indicate the possibility of creating new polymeric combshaped siloxane systems with a variable structure that can contribute to obtaining the properties desired from them. Combined with high selectivity gas separation, this makes it possible to use such comb-shaped polycarbonate siloxanes as film membrane materials with an increased operating temperature range. |
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