Carbowax-1000 a conducting polymer was found to give appreciable results in detection of explosive vapours in sensor applications. Coating of Carbowax-1000 over fused silica substrates using solvents such as Acetone, Chloroform, had less temperature stability. So, Carbowax-1000 is being used to form a Polyurethane. As a prelude dielectric parameters change was observed for HTPB-IPDI-PU (Hydroxyl-terminated polybutadiene – Isophorone diisocyanate – Polyurethane) when interacted with Toluene, THF, etc. using SPDR (Split Post Dielectric Resonator).
HTPB-IPDI-PU was synthesized and spin coated to obtain thin films of ≈2µm and cured for 5 days at 323 K. Initial frequency and quality factor value (Q) value were measured for bare substrate and polymer film coated substrate. Shift in resonance frequency and Q value was measured after placing Toluene, THF, etc. in µLs over the polymer film. Shift in resonance frequency ranged from 1-100 MHz for different solvents. Considerable Q value changes were also observed.