vguitВестник Воронежского государственного университета инженерных технологийProceedings of the Voronezh State University of Engineering Technologies2226-910X2310-1202VSUET10.20914/2310-1202-2026-2-352-363vguit-3815Research ArticleХимическая технологияFundamental and Applied chemistry, chemical technologyОценка химической стойкости эпоксидных покрытий с использованием критерия термодинамической совместимостиAssessment of Chemical Resistance of Epoxy Coatings Using the Criterion of Thermodynamic Compatibilityhttps://orcid.org/0009-0002-5422-4061ЩегольковН. И.ShchegolkovN. I.shegolkovnicita@ya.ruhttps://orcid.org/0000-0003-3005-6411КомароваЛ. Ю.KomarovaL. Yu.luknew@ya.ruhttps://orcid.org/0009-0008-0457-7460ЦыбинА. И.TsybinA. I.tsybin.a@tnzinc.ruhttps://orcid.org/0000-0002-6128-9413КонюховВ. Ю.KonyukhovV. Y.volkon_1@mail.ruhttps://orcid.org/0000-0001-6118-0808КондратовА. П.KondratovA. P.apkrezerv@mail.ruМосковский Политехнический университетРоссияMoscow Polytechnic UniversityRussian FederationООО «Техновацинк»РоссияLLC «Technovatsink»Russian Federation202630062026882352363Copyright © Щегольков Н.И., Комарова Л.Ю., Цыбин А.И., Конюхов В.Ю., Кондратов А.П., 20262026Щегольков Н.И., Комарова Л.Ю., Цыбин А.И., Конюхов В.Ю., Кондратов А.П.Shchegolkov N.I., Komarova L.Y., Tsybin A.I., Konyukhov V.Y., Kondratov A.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.vestnik-vsuet.ru/vguit/article/view/3815

Полимерные покрытия на основе эпоксидно-фенольных смол широко применяются для защиты углеродистой стали в нефтедобывающей и транспортной отраслях. Основной причиной потери адгезии и разрушения таких покрытий является диффузия агрессивных жидкостей через полимерную матрицу. Несмотря на подробную изученность сорбции воды термореактивными полимерами, данные о термодинамической совместимости эпоксидно-фенольных материалов с органическими растворителями представлены недостаточно. В работе для количественной оценки совместимости использован критерий Флори-Хаггинса, позволяющий прогнозировать образование истинного раствора или гетерофазной дисперсии в системе полимер–жидкость. Объектами исследования служили свободные пленки толщиной 180 ± 25 мкм на основе эпоксидно-фенольной смолы, отвержденной тремя ароматическими полиаминами: на основе карданола, диэтилтолуолдиамином и метилен-бис(орто-этиланилином). Кинетику сорбции в дистиллированной воде и о-ксилоле изучали гравиметрическим методом, изменение термомеханических свойств оценивали методом дифференциальной сканирующей калориметрии (ДСК). Установлено, что максимальная степень набухания в воде убывает в ряду: отвердитель на основе карданола > диэтилтолуолдиамин > метилен-бис(орто-этиланилин), тогда как в о-ксилоле последовательность меняется: карданольный отвердитель > метилен-бис(орто-этиланилин) > диэтилтолуолдиамин. Рассчитанные значения критерия Флори-Хаггинса свидетельствуют, что термодинамическая совместимость напрямую зависит от наличия полярных групп в структуре отвердителя. Наибольшая сорбция воды и о-ксилола зафиксирована для полимера с сшивающим агентом на основе карданола, что объясняется присутствием гидроксильной группы и длинного алифатического фрагмента. Методом ДСК установлено, что температура стеклования для полимера на основе диэтилтолуолдиамина после экспозиции в агрессивных средах не претерпела существенных изменений.

Epoxy-phenolic polymer coatings are widely used for the corrosion protection of carbon steel in the oil production and transportation industries. A primary cause of adhesion loss and coating degradation is the diffusion of aggressive liquids through the polymer matrix. While water sorption by thermosetting polymers has been extensively studied, data on the thermodynamic compatibility of epoxy-phenolic materials with organic solvents remain limited. In this work, the Flory–Huggins interaction parameter (χ) was employed to quantitatively assess compatibility and to predict whether a true solution or a heterogeneous dispersion forms in the polymer–liquid system. Free-standing films with a thickness of 180 ± 25 μm were prepared from an epoxy-phenolic resin cured with three aromatic polyamines: a cardanol-based hardener, diethyltoluenediamine, and methylene-bis(ortho-ethylaniline). Sorption kinetics in distilled water and o-xylene were studied gravimetrically, while changes in thermomechanical properties were evaluated by differential scanning calorimetry (DSC). It was established that the maximum degree of swelling in water decreases in the order: cardanol-based hardener > diethyltoluenediamine > methylene-bis(ortho-ethylaniline), whereas in o-xylene the sequence changes to: cardanol-based hardener > methylene-bis(ortho-ethylaniline) > diethyltoluenediamine. The calculated Flory–Huggins parameters indicate that thermodynamic compatibility is directly governed by the presence of polar groups within the hardener structure. The highest sorption of both water and o-xylene was recorded for the polymer crosslinked with the cardanol-based agent, which is attributed to the presence of hydroxyl groups and a long aliphatic segment. DSC analysis revealed that the glass transition temperature of the polymer based on diethyltoluenediamine did not undergo significant changes following exposure to the aggressive liquid media.

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The authors declare that there are no conflicts of interest present.