Most of the papers that I read carried out heating process ranging from 100 - 200 degrees within few hours. Can we skip this step so that practical application will be much easier?
Silanization (which is actually a kind of organic siloxane treatment) consists of two steps. First you apply the silane mixtrue in a low boilin gpoint solvent. The solvent evaporates and the residual silanes react with the ambient humidity (which should be controlled and higher than zero), the siloxane bonds are transformed into Si-OH (silanol) bonds. In the second step the silanol bonds react with each other (condensation reaction), Si-O-Si bonds and water molecules are formed. This second reaction is condiserably acclerated by heat and the reaction is driven to completion. Without heat treatmenyou will have a sticky surface with worse adhesion and the process will be much slower.
Mohd,
There is a degree of reversibility to the covalent bond formed between the silane and the substrate. In order to remove any water from the interface, we recommend curing the treated substrate at 110 deg C for 30 min or longer. If heating at 110 deg C is not an option for your application, you can also heat the silane treated surface at lower temperatures for longer times or in a vacuum oven. For more information on how silanes modify a surface please see http://www.gelest.com/themencode-pdf-viewer/?file=http://www.gelest.com/wp-content/uploads/HydrophobicityHydrophilicityandSilanes.pdf
Sue Tilford
Technical Services Chemist
Gelest
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