Abstract
The adhesive properties of pressure-sensitive adhesives based on interpolymer complexes of poly(vinyl caprolactam) and poly(N-isopropylacrylamide) with oligo(ethylene glycol) are studied. Poly(N-isopropylacrylamide) and poly(vinyl caprolactam) in such hydrogen-bonded complexes retain phase-separation ability in the presence of water at elevated temperatures which makes it possible to obtain adhesives that reversibly lose stickiness when heated. Analysis of the wettability of the surface of poly(vinyl caprolactam)–oligo(ethylene glycol) and poly(N-isopropylacrylamide)–oligo(ethylene glycol) films proves that tackiness is lost due to the hydrophobization of their surface during the phase transition. The switching temperature of the adhesives depends on their content of water. However, for dry compositions adhesion considerably decreases near the lower critical solution temperature.
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ACKNOWLEDGMENTS
The authors are grateful to E.V. Chernikova (Moscow State University) for assistance in the synthesis of polymers and conducting GPC studies.
The work was supported by the Ministry of Sciences and Higher Education of the Russian Federation using the equipment of the Center of Investigation of Molecular Structure, Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences.
Funding
M.M. Feldstein thanks OOO Smart Adhesives for financial support.
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Boval’dinova, K.A., Sherstneva, N.E., Fel’dshtein, M.M. et al. Pressure-Sensitive Adhesives with Tunable Tackiness. Polym. Sci. Ser. B 61, 458–470 (2019). https://doi.org/10.1134/S1560090419040018
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DOI: https://doi.org/10.1134/S1560090419040018