Synthesis and Physicochemical Analysis of Acrylic-Collagen Adhesive Coating Film Using a Bifunctional Crosslinking Agent
Authors
Khujakulov Kamoliddin, Sattorova Gulnoza, Shoyimov Shokhrux, Qodirov Tulqin
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In this study, a novel adhesive coating film was synthesized based on acrylic emulsion and hydrolyzed collagen in the presence of glutaraldehyde as a bifunctional crosslinking agent. The synthesis was carried out via emulsion radical polymerization using azobisisobutyronitrile (AIBN) as a radical initiator. The process was performed in a mechanically stirred reactor in four sequential stages, with the pH of the reaction medium maintained in the range of 7.5-8.5. These conditions facilitated covalent bonding between glutaraldehyde and the amino groups (-NH2) of collagen through crosslinking reactions, thereby optimizing the degree of crosslink formation. The chemical structure of the resulting film was investigated by infrared spectroscopy using the attenuated total reflectance (ATR) mode over the wavenumber range of 400-4000 cm-1. Comparative analysis of the IR spectra of individual components (acrylic emulsion, butyl acrylate, and glutaraldehyde) and the synthesized film confirmed the disappearance of the characteristic C=C vinyl bond absorption at 1635 cm-1 originating from butyl acrylate monomer, providing direct evidence for the completion of radical polymerization. Furthermore, the film spectrum revealed the following characteristic absorption bands: a C=O ester bond at 1727 cm-1 (attributable to polybutyl acrylate), C=O Amide I bands at 1684 and 1652 cm-1 (collagen), an N-H Amide II band at 1559 cm-1 (collagen), and a C=N bond at 1630 cm-1, the latter serving as direct spectroscopic evidence for the formation of covalent crosslinks between glutaraldehyde and collagen via Schiff base formation. The novel adhesive coating film obtained in this study provides a scientific foundation for the development of environmentally safe, high-adhesion coating materials for application in the leather and fur finishing industry.
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Authors
Khujakulov Kamoliddin, Sattorova Gulnoza, Shoyimov Shokhrux, Qodirov Tulqin
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