Synthesis of Spiropyran Photochromic Polymer

Photochromic spiropyran material is of the most extensive and in-depth category. Small molecule spiropyran ring by UV irradiation, the color is less stable body, which restricts the widespread use of these compounds. In this paper, the introduction of spiropyran compounds with substituents on the group method of open-loop stability, which will contain active groups spiropyran monomers in the polymer side chain connected to a rigid polymer to limit the use of spiropyran ring merocyanine body rotation, so that the body color is more stable. This selection and design of the process is simple with R = CH2OCOC (CH3) =CH2groups spiropyran monomer compounds, and then with methyl methacrylate polymer formed by radical means. By IR, NMR spectroscopy, mass spectrometry and gel permeation chromatography of the target compounds were characterized. UV spectrometer using the compounds of new photochromic properties were tested and the results shows spiropyran monomers and polymers have good photochromic properties. Discoloration kinetic of the spiropyran monomers and polymers in polar solvents proved to the spiropyran side connected to the polymer chain can significantly improve the stability of the color body.