Applications of pH sensor using a covalent bond indicator based on containing functional group copolymer

The purpose of this study was to immobilize copolymer that is able to covalent bonding with pH indicator. The pH sensitive polymers were synthesized with copolymers that are consisted of acryloylamino acid and chloroalkyl acrylate with MMA to get the optical fiber matrix. Fluoresceinamine indicator, containing amino group was immobilized covalently on prepared copolymers. The prepared pH sensing copolymers were measured sensitivity by UV-Visible spectroscopy. The pH-dependent value of copolymers was examined in the pH range of 2.00 similar to 12.00 HCl/NaOH solution at room temperature. As the length side chain and MMA molar ratio of the copolymers increases, the intensity decreases. Compared with imine group of copolymer-dye derivatives, amide group derivatives have a bathochromic shift on the UV-Visible spectrum.