Dye‐molecular‐imprinted polysiloxanes. II. Preparation, characterization, and recognition behavior

Abstract

Abstract Microsphere silica (AMS) was prepared by the sol–gel method and used for the synthesis of dye‐molecular‐imprinted polysiloxanes. These were prepared by the cohydrolysis and polycondensation of the AMS with functional organosilicone monomers ( N ‐phenylaminomethyl triethoxysilane, 3‐aminopropyl triethoxysilane, and 4‐aza‐6‐aminohexyl triethoxysilane) in the presence of a template molecule of disperse red (or disperse blue or water‐soluble dye) followed by the removal of the template molecule. The molecular‐imprinting and nonimprinting polysiloxanes were characterized by elemental analysis, diffuse‐reflectance Fourier transform infrared spectroscopy, and scanning electron microscopy. Their adsorption behavior toward the template molecule and nontemplate molecule was investigated. The molecular‐imprinting polysiloxane exhibited higher selective recognition properties toward the template molecule than the nonimprinting polysiloxane. In the experimental conditions, their adsorption isotherms were a good fit with the Langmuir model. The distribution coefficient value of water‐soluble‐dye‐imprinted polysiloxane was the highest among the three imprinting polysiloxanes under the experimental conditions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 637–643, 2004