An organo-trialkoxysilane is used as a raw material for membrane synthesis To minimize membrane porosity and ensure consistent membrane formation hydrolysis of the alkoxy groups before the synthesis must be kept to a minimum. Knowing the exact degree of hydrolysis is therefore crucial for the successful synthesis of the membrane. 

The organo-trialkoxysilane is kept as a concentrated solution (~40% active) in a polar aprotic solvent (a cyclic ester solvent), under conditions that are not absolutely anhydrous. In this environment, neither water content nor alcohol formation alone provides a reliable measure of hydrolysis, as hydrolysis and condensation may occur in parallel and the solution can evolve into a complex mixture of unreacted silane, partially hydrolyzed species, silanols, and early oligomers. Developing a rapid, reliable, and preferably non-destructive way to track hydrolysis in this specific system would enable better control of precursor quality before use, support more consistent membrane synthesis, and help define acceptable limits of pre-reaction without disrupting industrial workflows.