|Name||Mr. Thaaer Khalil Sr.|
|Organization or Institution||Florida institute of technology|
Synthesis of merocyanine-photoacid polymers
Merocyanine-photoacid is a type metastable-state photoacid that can be reversibly converted to a
strong acid upon visible-light irradiation. This type of photoacid has been used to control proton transfer in both chemical and biological processes. Merocyanine-photoacid has been used in a wide range of application including energy conversion, sensor, polymerization, patterning, nanomaterial, molecular machine, photochromic materials, and biomedical. Free radical polymerization of merocyanine photoacid is difficult due to the presence of the phenol moiety in the photoacid which is a radical quencher. In this work, we overcame this problem without using a protecting group for the phenol by converting the protonated merocyanine to spiropyran under a basic condition. Copolymers of a photoacid monomer and N-isopropyl acrylamide or hydroxyethyl methacrylate with different loading of the photoacid were synthesized. The resulting polymers are sufficiently soluble in both polar and nonpolar solvents in comparison with photoacid monomer. Moreover, the photoacid polymers showed high photoactivity and reversible photoacidity. Reversible patterning has been demonstrated using thin films of a photoacid polymer doped with methyl orange. A pattern on the film can be created by irradiating the film through a mask and erased by heating the film for 10 min at 80 degree.