Preview

Fine Chemical Technologies

Advanced search

MECHANISM OF THE HETEROPHASE HYDROLYSIS OF METHYLPHENYLDIMETHOXYSILANE

Full Text:

Abstract

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<sup>-3</sup> s<sup>-1</sup> ) 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.

About the Authors

N. G. Mazhorova
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


P. V. Ivanov
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


References

1. Милешкевич В.П., Николаев Г.А., Евдокимов В.Ф., Карлин А.В. Кинетика гидролиза органохлорсиланов // Журн. орган. химии. 1971. Т. 41. Вып. 3. С. 634-638.

2. Иванов П.В. Особенности поликонденсации органосиланолов // Вестник МИТХТ. 2011. Т. 6. № 3. С. 3-22.

3. Иванов П.В., Голубых Д.Н., Чернышев Е.А. Интермедиаты химической сборки олигоорганосилоксанов // Известия РАН. 2001. № 11. С. 1909-1919.

4. Иванов П.В., Маслова В.И., Бузырева Н.М., Мажорова Н.Г., Голубых Д.А., Костикова Л.В., Мозжухин А.С., Чернышев Е.А. Макрокинетика гидролитической поликонденсации органо-хлорсиланов // Журн. Всерос. хим. об-ва им. Д.И. Менделеева. 1998. Т. XLII. № 6. С. 87-94.

5. Иванов П.В. Теоретические основы химической технологии органохлорсиланов : дис. … д-ра хим. наук. - М., 1998. 317 с.

6. Brinker C.J., Sherer G.W. Sol-Gel Science: the Physics and Chemistry of Sol-Gel Processing. - NY: Academic Press, 1990. 348 р.

7. Иоффе Б.В. Рефрактометрические методы химии. - Л: Химия, 1974. 400 c.

8. Трейбал Р. Жидкостная экстракция. - М.: Химия, 1966. 724 c.

9. Hatta S. Absorption velocity of gases by liquids. II. Theoretical considerations of gas absorption due to chemical reactions / Technological Reports of Tôhoku University. 1932. V. 10. Р. 613-622

10. Cоколов Л.Б. Основы синтеза полимеров методом поликонденсации. - М.: Химия, 1979. 264 с.

11. Hench L.L., West J.K. The sol-gel process // Chem. Rev. 1990. V. 90. Р. 33-72.


For citation:


Mazhorova N.G., Ivanov P.V. MECHANISM OF THE HETEROPHASE HYDROLYSIS OF METHYLPHENYLDIMETHOXYSILANE. Fine Chemical Technologies. 2013;8(5):55-61. (In Russ.)

Views: 48


ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)