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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2019-63-6-695-703</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-822</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ХИМИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CHEMISTRY</subject></subj-group></article-categories><title-group><article-title>Состояние ионов и молекул воды в водно-солевых растворах полиакриламида и сополимера «акриламид-Na/k соль акриловой кислоты»</article-title><trans-title-group xml:lang="en"><trans-title>State of ions and water molecules in the water salt solutions of polyacrylamide and co-polymer of “acrylamide–acrylic acid Na/k salt”</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Солдатов</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Soldatov</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Солдатов Владимир Сергеевич – академик, д-р хим. наук, профессор, гл. науч. сотрудник. </p><p>ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Soldatov Vladimir Sergeevich – Academician, D. Sc. (Chemistry), Professor, Chief researcher. </p><p>13, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">soldatov@ifoch.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Давлюд</surname><given-names>Д. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Davlyud</surname><given-names>D. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Давлюд Дарья Николаевна – науч. сотрудник. </p><p>ул. Сурганова, 9/1, 220072, Минск</p></bio><bio xml:lang="en"><p>Davlyud Daria Nikolaevna – Researcher. </p><p>9/1, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">davlud.d@tut.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Безъязычная</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bezyazychnaya</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Безъязычная Татьяна Владимировна – канд. физ.мат. наук, ст. науч. сотрудник. </p><p>ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Bezyazychnaya Tatyana Vladimirovna – Ph. D. (Physics and Mathematics), Senior researcher.  </p><p>13, Surganov Str., 220072, Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Воробьева</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vorobieva</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Воробьёва Елена Викторовна – д-р хим. наук, доцент, заведующий лабораторией.</p><p>ул. Сурганова, 9/1, 220072, Минск</p></bio><bio xml:lang="en"><p>Vorobieva Elena Viktorovna – D. Sc. (Chemistry), Associate professor, Head of the Laboratory. </p><p>9/1, Surganov Str., 220072, Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Косандрович</surname><given-names>Е. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kasandrovich</surname><given-names>E. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Косандрович Евгений Генрихович – канд. хим. наук, доцент, заведующий лабораторией. </p><p>ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Kasandrovich Evgenii Genrikhovich – Ph. D. (Chemistry), Associate professor, Head of the Laboratory. </p><p>13, Surganov Str., 220072, Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Воробьев</surname><given-names>П. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Vorobiev</surname><given-names>P. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Воробьев Павел Дмитриевич – канд. хим. наук, ст. науч. сотрудник. </p><p>ул. Сурганова, 9/1, 220072, Минск</p></bio><bio xml:lang="en"><p>Vorobiev Pavel Dmitrievich – Ph. D. (Chemistry), Senior researcher.</p><p>9/1, Surganov Str., 220072, Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физико-органической химии Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute Physical Organic Chemistry of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт общей и неорганической химии Нацональной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2020</year></pub-date><volume>63</volume><issue>6</issue><fpage>695</fpage><lpage>703</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Солдатов В.С., Давлюд Д.Н., Безъязычная Т.В., Воробьева Е.В., Косандрович Е.Г., Воробьев П.Д., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Солдатов В.С., Давлюд Д.Н., Безъязычная Т.В., Воробьева Е.В., Косандрович Е.Г., Воробьев П.Д.</copyright-holder><copyright-holder xml:lang="en">Soldatov V.S., Davlyud D.N., Bezyazychnaya T.V., Vorobieva E.V., Kasandrovich E.G., Vorobiev P.D.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://doklady.belnauka.by/jour/article/view/822">https://doklady.belnauka.by/jour/article/view/822</self-uri><abstract><p>Геометрические и электронные параметры молекулярных моделей микросостояний полиакриламида и сополимера акриламида с акриловой кислотой в водных растворах хлоридов натрия и калия были рассчитаны неэмпирическим методом ССП МО ЛКАО с использованием базиса MINI Huzinaga. Модели содержали четыре мономерных звена полимеров, 80 молекул воды и по две пары ионов Na+ и Сl– или k+ и Cl–. Показано, что принципиальная разница в гидратационных свойствах Na+ и k+ состоит в том, что длина связи Na+‧‧‧О2– короче суммы радиусов взаимодействующих ионов, а k+‧‧‧O2– – равна или больше. Это свидетельствует о том, что в первом случае связь частично ковалентная, а во втором – чисто электростатическая. Все элементы молекулярных моделей в обоих случаях объединены между собой межмолекулярными связями, образующими непрерывную пространственную сеть, в которую без искажения ее структуры встраиваются молекулы полимеров, имеющие в своем составе кислородсодержащие группы. Это и является причиной хорошей растворимости изученных полимеров в водно-солевых растворах.</p></abstract><trans-abstract xml:lang="en"><p>Geometrical and electronic parameters of the microstates of the molecular models of polyacrylamide and co-polymers of acrylamide-acrylic acid in aqueous solutions of sodium and potassium chlorides were computed by the non-empirical SCF MO LCAO method with the use of the basis MINI Huzinaga. The models contained four monomeric units of the polymer, including two metal carboxylate groups, 80 water molecules and two pairs of ions Na+ and Cl– or K+ and Cl–. It follows from the calculation results that there is a principal difference in the hydration of Na+ and K+: the Na+‧‧‧О2– bond is shorter than the sum of the radii of the interacting ions, while the k+‧‧‧O2– bond is equal or longer. This indicates that in the first case, the bonds are partially covalent, while in the second one they are pure electrostatic. All elements of the molecular models in the both cases are combined by the intermolecular bonds forming a spatial net. The polymer molecules have a flexible chain with oxygen containing functional groups that are built into the structure of the salt solutions without distorting it. We assume that this is the main reason for the good solubility of the studied polymers in the aqueous salt solutions.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>полиакриламид</kwd><kwd>водорастворимые полимеры</kwd><kwd>анионные полимеры</kwd><kwd>квантово-химический расчет</kwd><kwd>гидратная структура</kwd><kwd>солевые растворы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>polyacrylamide</kwd><kwd>water-soluble polymers</kwd><kwd>anionic polymers</kwd><kwd>quantum chemical calculations</kwd><kwd>hydrate structure</kwd><kwd>saline solutions</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Куренков, В. Ф. Полиакриламидные флокулянты / В. Ф. Куренков // Соросовский образовательный журн. – 1997. – № 7. – С. 57–63.</mixed-citation><mixed-citation xml:lang="en">Kurenkov V. F. Polyacrylamide flocculants. 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