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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">chemicallytech</journal-id><journal-title-group><journal-title xml:lang="en">Fine Chemical Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Тонкие химические технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-6593</issn><issn pub-type="epub">2686-7575</issn><publisher><publisher-name>MIREA – Russian Technological University (RTU MIREA).</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2410-6593-2024-19-5-429-440</article-id><article-id custom-type="edn" pub-id-type="custom">TIVMNY</article-id><article-id custom-type="elpub" pub-id-type="custom">chemicallytech-2161</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="en"><subject>SYNTHESIS AND PROCESSING OF POLYMERS AND POLYMERIC COMPOSITES</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СИНТЕЗ И ПЕРЕРАБОТКА ПОЛИМЕРОВ И КОМПОЗИТОВ НА ИХ ОСНОВЕ</subject></subj-group></article-categories><title-group><article-title>Features of the change in the thermal coefficient of electrical resistance upon heating electrically conductive composites of crystallizable polyolefins with carbon black</article-title><trans-title-group xml:lang="ru"><trans-title>Особенности изменения термического коэффициента электрического сопротивления при нагревании электропроводящих композиций кристаллизующихся полиолефинов с техническим углеродом</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7952-7419</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Марков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Markov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Марков Анатолий Викторович, д.т.н., профессор кафедры химии и технологии переработки пластмасс и полимерных композитов</p><p>119571, Москва, пр-т Вернадского, д. 86</p><p>Scopus Author ID 57222377754</p></bio><bio xml:lang="en"><p>Anatoly V. Markov, Dr. Sci. (Eng.), Professor, Department of Chemistry and Technology of Plastics and Polymer Composites Processing</p><p>86, Vernadskogo pr., Moscow, 119571</p><p>Scopus Author ID 57222377754</p></bio><email xlink:type="simple">markovan@bk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-4418-5825</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зверев</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Zverev</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зверев Александр Евгеньевич, аспирант кафедры химии и технологии переработки пластмасс и полимерных композитов</p><p>119571, Москва, пр-т Вернадского, д. 86</p></bio><bio xml:lang="en"><p>Alexander E. Zverev, Postgraduate Student, Department of Chemistry and Technology of Plastics and Polymer Composites Processing</p><p>86, Vernadskogo pr., Moscow, 119571</p></bio><email xlink:type="simple">azmonst@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5768-9107</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Марков</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Markov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Марков Василий Анатольевич, к.т.н., ведущий инженер-программист, ООО «Белл Интегратор Инновации»</p><p>119192, Москва, Раменский бульвар, д. 1, ИНТЦ МГУ «Воробьевы горы», кластер «Ломоносов»</p><p>Scopus Author ID 57189505018</p></bio><bio xml:lang="en"><p>Vasily A. Markov, Cand. Sci. (Eng.), Lead Software Engineer, Bell Integrator Innovations</p><p>1, Ramenskii bul., INTTs MGU Vorob’evy Gory, Lomonosov klaster, Moscow, 119192</p><p>Scopus Author ID 57189505018</p></bio><email xlink:type="simple">markov.vasily@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>МИРЭА - Российский технологический университет (Институт тонких химических технологий им. М.В. Ломоносова)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>04</day><month>11</month><year>2024</year></pub-date><volume>19</volume><issue>5</issue><fpage>429</fpage><lpage>440</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Markov A.V., Zverev A.E., Markov V.A., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Марков А.В., Зверев А.Е., Марков В.А.</copyright-holder><copyright-holder xml:lang="en">Markov A.V., Zverev A.E., Markov V.A.</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://www.finechem-mirea.ru/jour/article/view/2161">https://www.finechem-mirea.ru/jour/article/view/2161</self-uri><abstract><p>Objectives. To investigate electrically conductive polymer composite materials (EPCMs) based on crystallizable polyolefins and electrically conductive carbon black for the production of self-regulating heaters; to study the mechanism of the occurrence of positive and negative temperature coefficients (PTC and NTC) upon heating such composites.Methods. A comprehensive study of the structure and properties of crystallizable EPCMs with electrically conductive technical carbon was carried out. In order to measure the electrical characteristics of the composites, they were compacted into plates to model polymer heaters. Contact electrodes made of an ungreased brass mesh were embedded in their ends. The temperature dependencies of the electrical characteristics of the samples were investigated in a modified thermal chamber of an FWV 633.10 Vicat softening temperature meter. The change in the degree of crystallinity was analyzed by means of differential scanning calorimetry with a NETZSCH DSC 204 F1 Phoenix calorimeter. The dilatometric and rheological characteristics of the samples were studied using an IIRT-AM melt flow index tester.Results. It was determined that the self-regulation ability (an abnormally high positive thermal coefficient of electrical resistance) of selfregulating heaters made of composites of crystallizable polyolefins with electrically conductive technical carbon cannot be explained by the thermal expansion of EPCMs alone. It was shown that in crystallizable polyolefin-based EPCMs, the inversion of the thermal coefficients of electrical resistance (transition from PTC to NTC) is associated with a change in the aggregate state of EPCMs and the beginning of its transition to a viscous-flow state. A mechanism involving a sharp increase in the electrical resistance of self-regulating crystallizable polyolefin-based composite with electrically conductive technical carbon was proposed and substantiated. This mechanism takes into account the additional shear deformation effect produced on the crystalline phase of the EPCM by numerous expanding melt microvolumes formed at the early stages of the melting process with a minimum change in the degree of crystallinity.</p></abstract><trans-abstract xml:lang="ru"><p>Цели. Исследовать электропроводящие полимерные композиционные материалы (ЭПКМ) на основе кристаллизующихся полиолефинов и электропроводного технического углерода (ЭТУ) для производства саморегулирующихся нагревателей. Изучить механизм возникновения эффектов положительного и отрицательного температурных коэффициентов (ПТК и ОТК) в процессе нагревания композитов.Методы. Проведено комплексное исследование структуры и свойств кристаллизующихся ЭПКМ с ЭТУ. Для исследования электрических характеристик композиций были отпрессованы пластины с запрессованными на концах контактными электродами из обезжиренной латунной сетки, моделирующие полимерные нагреватели. Исследование зависимостей электрических характеристик образцов от температуры проводили в модифицированной термокамере прибора FWV 633.10 для определения температуры размягчения Вика. Изменение степени кристалличности исследовали методом дифференциальной сканирующей калориметрии на приборе NETZSCH DSC 204F1 Phoenix. Исследование дилатометрических и реологических характеристик образцов проводили на приборе для определения показателя текучести (ИИРТ-АМ).Результаты. Установлено, что появление у саморегулирующихся нагревателей, изготовленных из кристаллизующихся полиолефиновых композиций с ЭТУ, способности саморегулирования (появления аномально высокого положительного термического коэффициента электрического сопротивления) нельзя объяснить только термическим расширением ЭПКМ. Показано, что в кристаллизующихся полиолефиновых ЭПКМ инверсия термических коэффициентов электрического сопротивления (переход от ПТК к ОТК) связана с изменением агрегатного состояния ЭПКМ и началом его перехода в вязкотекучее состояние. Предложен и обоснован механизм резкого роста электрического сопротивления саморегулирующихся кристаллизующихся полиолефиновых композиций с ЭТУ, учитывающий дополнительное сдвиговое деформационное воздействие на кристаллическую фазу ЭПКМ множества расширяющихся микрообъемов расплава, возникающих на ранних стадиях процесса плавления при минимальном изменении степени кристалличности.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>электропроводящие полимерные композиты</kwd><kwd>саморегулирующиеся нагреватели</kwd><kwd>полиолефины</kwd><kwd>электропроводный технический углерод</kwd><kwd>положительный температурный коэффициент электрического сопротивления (ПТК)</kwd><kwd>отрицательный температурный коэффициент электрического сопротивления (ОТК)</kwd></kwd-group><kwd-group xml:lang="en"><kwd>electrically conductive polymer composites</kwd><kwd>self-regulating heaters</kwd><kwd>polyolefins</kwd><kwd>electrically conductive carbon black</kwd><kwd>positive temperature coefficient of electrical resistance (PTC)</kwd><kwd>negative temperature coefficient of electrical resistance (NTC)</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в соответствии с программой инициативной научно-исследовательской работы 195-ИТХТ.</funding-statement><funding-statement xml:lang="en">This work was carried out in accordance with the 195-ITKhT Initiative Research Program.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Рагушина М.Д., Евсеева К.А., Калугина Е.В., Ушакова О.Б. 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