MECHANISM OF THE HETEROPHASE HYDROLYSIS OF METHYLPHENYLDIMETHOXYSILANE
| Autor: | N. G. Mazhorova, P. V. Ivanov |
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| Jazyk: | ruština |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Тонкие химические технологии, Vol 8, Iss 5, Pp 55-61 (2013) |
| Druh dokumentu: | article |
| ISSN: | 2410-6593 2686-7575 |
| Popis: | The initial stages of methylphenyldimethoxysilane hydrolysis in acetone were investigated. The boundaries of diffusion and kinetic areas of the process were defined. Methylphenyldimethoxysilane hydrolysis proceeds to kinetic mode at a lower mixing intensity than methylphenyldichlorosilane hydrolysis does. The constant of methylphenyldimethoxysilane hydrolysis rate (Kh = 0.5×10-3 s-1 ) was found. Unlike methylphenyldichlorosilane hydrolysis, methylphenyldimethoхysilane hydrolysis products composition is independent of the concentration of acetone. This fact indicates a low selectivity of the process. The part of oligomeric products is quite large. Homocondensation is supposed to make a greater contribution to the formation of methylphenyloligoorganosiloxanes than heterocondensation does. The presence of methylphenyldimethoxysilane hydrolysis products depending on water-methylphenyldimethoxysilane ratio shows that the hydrolysis occurs in both phases of the system, and the main reaction zone is the organic phase. |
| Databáze: | Directory of Open Access Journals |
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