Calorimetric investigation of the enthalpy of hydrolysis and condensation reactions of methyl-alkoxy-silanes during sol-gel processes

By calorimetric measurements the heats of gel formation of alkoxy-silanes are shown to be the sum of the molar enthalpies (related per mol alkoxy groups of the starting product) of hydrolysis (6.2±0.3 kJ mol −1), condensation (−4.5±0.3 kJ mol −1) and sol-gel transformation (−1.8 to −3.4 kJ mol −1)....

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Bibliographic Details
Published in:Journal of non-crystalline solids 1988-10, Vol.105 (1), p.162-164
Main Authors: Tiller, H.-J., Göbel, R., Hartung, U.
Format: Article
Language:English
Subjects:
Aerosols
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
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Summary:By calorimetric measurements the heats of gel formation of alkoxy-silanes are shown to be the sum of the molar enthalpies (related per mol alkoxy groups of the starting product) of hydrolysis (6.2±0.3 kJ mol −1), condensation (−4.5±0.3 kJ mol −1) and sol-gel transformation (−1.8 to −3.4 kJ mol −1). The separation of the heats was realized experimentally by the use of different (CH 3) n Si(OC 2H 5) 4− n compounds under selected reaction conditions.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(88)90351-1