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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 custom-type="elpub" pub-id-type="custom">dan-44</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>ТЕХНИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>TECHNICAL SCIENCES</subject></subj-group></article-categories><title-group><article-title>СТРУКТУРА И СВОЙСТВА СМЕСЕЙ ПОЛИБУТИЛЕНТЕРЕФТАЛАТА И ПОЛИБУТИЛЕНТЕРЕФТАЛАТ-ПОЛИТЕТРАМЕТИЛЕНОКСИДНОГО БЛОК-СОПОЛИМЕРА, СОДЕРЖАЩИХ ДОБАВКИ УДЛИНИТЕЛЯ ЦЕПИ</article-title><trans-title-group xml:lang="en"><trans-title>STRUCTURE AND PROPERTIES OF POLY(BUTYLENE TEREPHTHALATE) AND POLY(BUTYLENE TEREPHTHALATE)-POLY(TETRA METHYLENE OXIDE) BLOCK COPOLYMER BLENDS WITH CHAIN EXTENDER ADDITIVES</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>ШЕВЧЕНКО</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>SHEVCHENKO</surname><given-names>V. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>ПЕСЕЦКИЙ</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>PESETSKII</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>член-корреспондент</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт механики металлополимерных систем им. В. А. Белого НАН Беларуси, Гомель</institution></aff><aff xml:lang="en"><institution>V. A. Belyi Metal-Polymer Research Institute of the National Academy of Sciences of Belarus, Gomel</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>24</day><month>05</month><year>2016</year></pub-date><volume>60</volume><issue>2</issue><fpage>109</fpage><lpage>115</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ШЕВЧЕНКО В.В., ПЕСЕЦКИЙ С.С., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">ШЕВЧЕНКО В.В., ПЕСЕЦКИЙ С.С.</copyright-holder><copyright-holder xml:lang="en">SHEVCHENKO V.V., PESETSKII S.S.</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/44">https://doklady.belnauka.by/jour/article/view/44</self-uri><abstract><p>Исследовано влияние добавок диизоцианатного удлинителя цепи (УЦ) на изменение молекулярно-структурных характеристик, реологических и механических свойств смесей полибутилентерефталата (ПБТ) с полиэфирным термоэластопластом (ПТЭП), имеющих различную фазовую структуру.Показано, что введение добавок УЦ в количестве от 0,2 до 1,25 мас. % приводит к росту вязкости расплавов и растворов полиэфиров вследствие протекания в расплавах реакций удлинения цепи и межмолекулярного сшивания макроцепей. УЦ оказывает сильное влияние на характер деформационных кривых при растяжении как исходных полиэфиров, так и их смесей независимо от соотношения компонентов в них (фазовой структуры материалов). При увеличении его концентрации повышаются значения верхнего и нижнего пределов текучести и снижается различие в значениях данных показателей, т. е. зуб текучести постепенно вырождается. УЦ влияет также на кристаллизуемость как отдельных полиэфирных компонентов, так и их смесей. Общей тенденцией независимо от типа полиэфира и фазовой структуры смеси является снижение температуры кристаллизации, что обусловлено ограничением молекулярной подвижности вследствие роста молекулярной массы полиэфиров и интенсификации межцепных взаимодействий.</p></abstract><trans-abstract xml:lang="en"><p>The effect of diisocyanate chain extender (CE) on the rheological, and relaxation properties, as well as on the molecular weight and crystallizability, of poly(butylene terephthalate) (PBT) and thermoplastic polyester elastomer (TPEE) blends with the different-phase structure has been studied. It has been showed that CE in the amount of 0.2 up to 1.25 % leads to an increase in polyesters melt and solutions viscosity because of chain extending and cross-linking reactions. Values of high and low flow limits increase with increasing the CE concentration regardless of the phase structure of blends. It is revealed that СЕ decreases the polyesters melt-crystallization temperature; the crystallinity reduces simultaneously, which is indicative of the crystallization deceleration owing to a growth of the molecular weight.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>удлинитель цепи</kwd><kwd>полибутилентерефталат</kwd><kwd>полиэфирный термоэластопласт</kwd><kwd>молекулярный вес</kwd></kwd-group><kwd-group xml:lang="en"><kwd>chain extender</kwd><kwd>poly(butylene terephthalate)</kwd><kwd>thermoplastic polyester elastomer</kwd><kwd>molecular weight</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">Gallucci, R. R. Poly (Butylene Terephthalate) / R. R. Gallucci, B. R. Patel // Modern Polyesters: Chemistry and Technology of Polyesters and Copolyesters / ed. J. Scheirs, T. E. 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