Abstract
Although micro-Raman spectroscopy is a useful method as a strain probe with high spatial resolution, it produced relatively limited results for some Raman inactive materials, such as metals. In this study, acetylene-containing polyurethanes were prepared for strain-sensing materials. Solutions of the polymers were coated onto an Al wire, and then Raman spectra from the coated polymers were measured simultaneously during stretching. As the results, the Raman frequency of C=C stretching mode of the coated polymer shifted at a rate of about -2cm-1/%. In the past, for cross-linking of cast film, diacetylene-containing prepolymers were heated to prepare strain-sensing materials, but the present polymers do not have the necessity of heating. So, an usage of these polymers not only simplifies the process but also makes to spread a material application field.
