2025 (4) 2
https://doi.org/10.15407/polymerj.47.04.191
SYNTHESIS, STRUCTURE, AND PERFORMANCE CHARACTERISTICS OF ADHESIVES BASED ON ALKYL ACRYLATES WITH DIFFERENT CROSS-LINKERS
OLGA SLISENKO (ORCID: 0000-0003-2973-6671), VIRA BUDZINSKA (ORCID: 0000-0002-8616-0747), IRYNA BEI (ORCID: 0000-0001-5618-3043), OLEKSANDR TOLSTOV (ORCID: 0000-0001-6016-9308)
Institute of Macromolecular Chemistry of the NAS of Ukraine
48 Kharkivske Highway, Kyiv, 02155, Ukraine
E-mail: olgaslisenko@ukr.net
Abstract
New acrylate adhesive materials with increased adhesion ability and a wide temperature range were synthesized through photoinitiated radical polymerization. Low-molecular trifunctional trimethylolpropane triacrylate (TMPTA) or bifunctional oligoetherurethane dimethacrylate (OUA) that allow for adjusting the structural features and adhesive properties of the target products, were used as crosslinking agents. The complete conversion of C=C bonds of acrylic monomers, as indicated by the disappearance of characteristic absorption bands of double bonds (C=C) in the range of 1638–1621, 1406 cm−1, was confirmed by FTIR spectroscopy. The multiphase structure of synthesized copolymers was confirmed by the presence of low-temperature relaxation transitions, which are essential for maintaining the main characteristics of the materials across a wide temperature range (at least down to −20 °C). The Tg of acrylate adhesives synthesized using OUA is lower than that of similar adhesives made with TMPTA, indicating greater flexibility of the chains and resulting in more elastic adhesive materials. Replacing the crosslinking agent with TMPTA increases the Tg to −42.8 °C by shortening the segments between the crosslinking nodes, resulting in more rigid polymer chains of the acrylate copolymer. It is found that the thermooxidative behavior of the synthesized copolymer matrices is highly dependent on their structure. Specifically, the presence of a COOH-containing monomer causes the matrix to start degrading at lower temperatures, but the rate of destruction decreases significantly afterward compared to matrices containing exclusively acrylates with hydrocarbon substituents. The created adhesives demonstrate high adhesion rates through the method of uniform layering on various types of model surfaces, including those with applied artificial sweat. It is shown that the best adhesive samples exhibit improved performance indicators comparable to those of top commercial adhesive products of this type.
Keywords: pressure–sensitive adhesives, acrylates, UV-curing, structure, properties.
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