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المؤلفIssa A.A.
المؤلفEl-Azazy M.
المؤلفLuyt A.S.
تاريخ الإتاحة2020-04-01T06:50:40Z
تاريخ النشر2019
اسم المنشورScientific Reports
المصدرScopus
الرقم المعياري الدولي للكتاب20452322
معرّف المصادر الموحدhttp://dx.doi.org/10.1038/s41598-019-54095-0
معرّف المصادر الموحدhttp://hdl.handle.net/10576/13602
الملخصAlkoxysilanes and organoalkoxysilanes are primary materials in several industries, e.g. coating, anti-corrosion treatment, fabrication of stationary phase for chromatography, and coupling agents. The hydrolytic polycondensation reactions and final product can be controlled by adjusting the hydrolysis reaction, which was investigated under a variety of conditions, such as different alkoxysilanes, solvents, and catalysts by using gas chromatography. The hydrolysis rate of alkoxysilanes shows a dependence on the alkoxysilane structure (especially the organic attachments), solvent properties, and the catalyst dissociation constant and solubility. Some of the alkoxysilanes exhibit intramolecular catalysis. Hydrogen bonding plays an important role in the enhancement of the hydrolysis reaction, as well as the dipole moment of the alkoxysilanes, especially in acetonitrile. There is a relationship between the experimentally calculated polarity by the Taft equation and the reactivity, but it shows different responses depending on the solvent. It was found that negative and positive charges are respectively accumulated in the transition state in alkaline and acidic media. The reaction mechanisms are somewhat different from those previously suggested. Finally, it was found that enthalpy–entropy compensation (EEC) effect and isokinetic relationships (IKR) are exhibited during the hydrolysis of CTES in different solvents and catalysts; therefore, the reaction has a linear free energy relationship (LFER).
راعي المشروعThe publication of this article was funded by the Qatar National Library.
اللغةen
الناشرNature Research
الموضوعSilica gel
Pressure drying
العنوانKinetics of alkoxysilanes hydrolysis: An empirical approach
النوعArticle
رقم العدد1
رقم المجلد9
dc.accessType Open Access


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