| Improving structural objects maintenance， disaster damage prevention and mitigation is an important social research theme. Structural inspection by easy to use approach is required for early detection of structural degradation. Visualization of the physical stress， strain， and crack using functional materials has attracted a lot of attention recently. Oxygen sensory polymer coating based on luminescent quenching has been developed for visualization of oxygen pressure distribution.1-3 In this report， the optical oxygen sensor coating was applied to detect degradation of structural objects and painting. Among these sensory dyes， tetrakis pentafluorophenyl platinumporphyrin (PtTFP) was selected as the oxygen sensory dye molecule because PtTFP emits strong luminescence with high quantum and significantly stable under UV light. Platinum porphyrin (PtTFP) displayed strong luminescence at 650 nm which was efficiently quenched in response to oxygen. The dye was dispersed in poly(1-trimethylsilyl-1-propyne) (PMSP) or polyurethane coating. PMSP with high gas permeability was used as the sensory polymer matrix. The coating sealed with gas-barrier polymer was prepared as sensory coating or tensile specimen. Microscopic crack or degradation on the surface was successfully visualized by means of analyzing luminescence and quenching images using commercially available compact digital camera. Surface morphology analysis and advanced sensory dye polymer materials will be also reported. |
