To compare the rate constant data obtained from deflection-spectroscopy, with that obtained conventionally, UV-VIS spectroscopy method was employed. PDMS oligomer mixed with the crosslinking agent was first dispensed into a standard UV Vis polystyrene cuvette to fill it partially; the cuvette was then placed horizontally and the liquid layer (of thickness ~ 0.8 mm) was cured for 72 hours at 24 o C to form a thin film on one side wall of the cuvette (Fig. ).