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Влияние оксида церия как наноразмерного активного наполнителя на свойства Ñ‚ÐµÑ€Ð¼Ð¾ÑÑ‚Ð¾Ð¹ÐºÐ¸Ñ Ð¿Ð¾Ð»Ð¸Ð¼ÐµÑ€Ð½Ñ‹Ñ Ð¼Ð°Ñ‚ÐµÑ€Ð¸Ð°Ð»Ð¾Ð²

выпускная квалификационная работа бакалавра

Влияние оксида церия как наноразмерного активного наполнителя на свойства Ñ‚ÐµÑ€Ð¼Ð¾ÑÑ‚Ð¾Ð¹ÐºÐ¸Ñ Ð¿Ð¾Ð»Ð¸Ð¼ÐµÑ€Ð½Ñ‹Ñ Ð¼Ð°Ñ‚ÐµÑ€Ð¸Ð°Ð»Ð¾Ð²

Abstract

Тема выпускной квалификационной работы: Влияние оксида церия как наноразмерного активного наполнителя на свойства термостойких полимерных материалов. Данная работа посвящена исследованию особенностей влияния наночастиц оксида церия как активного наполнителя на механические и термические свойства пленок различных по химической структуре термостойких ароматических полиимидов. Показано, что введение в пленки матричных полимеров различной химической структуры наночастиц оксида церия может приводить как к заметному повышению, так и к существенному снижению термостойкости материала в процессе термоокислительной деструкции. Установлено, что введение наночастиц оксида церия в полиимиды, содержащие сульфоновые группы в элементарных звеньях полимерных цепей, приводит к повышению термостойкости пленок в воздушной атмосфере на 20-40 град. При этом подобное влияние наночастиц наблюдается только в окислительной среде. Показатели термостойкости композитных пленок и матричных полимеров в инертной атмосфере различаются незначительно. Для исследованных полиимидов введение оксида церия не оказывает заметного влияния на температуры стеклования, однако, как было показано, может поспособствовать последовательному ограничению податливости некоторых пленок в расстеклованном состоянии. В ходе исследования установлено, что наночастицы оксида церия, определенно могут рассматриваться как перспективный материал в качестве модифицирующего активного наполнителя материалов на основе термостойких ароматических полиимидов.

The subject of the graduate qualification work is “Impact of cerium oxide as an active nano-sized filler on the properties of the thermally stable polymer materials”. This work is devoted to studying the features of the influence of cerium oxide nanoparticles as an active filler on mechanical and thermal properties of aromatic polyimides films with different chemical structures. It was shown that the introduction of cerium oxide nanoparticles into the films of matrix polymers with different chemical structures can lead to both a noticeable increase and a significant decrease of the thermal resistance of the material in the process of thermo-oxidative decomposition. Thus, thermal properties of a nanocomposite based on the polyimide containing SO2-groups in the elementary unit of the polymer chain were found to be substantially enhanced by 20-40 degrees upon incorporation of the nanoparticles in the matrix. However, this effect of nanoparticles is observed only in an oxidizing environment. The thermal stability indices of composite films and matrix polymers in an inert atmosphere differ insignificantly. For the studied polyimides, the introduction of cerium oxide does not have a noticeable effect on the glass transition temperature; however, as was shown, it can contribute to a sequential limitation of the flexibility of some films in the devitrified state. The research found that cerium oxide nanoparticles can definitely be considered as promising material as modifying active filler of materials based on the thermally stable aromatic polyimides.

Keywords

полиимиды, термостойкость, нанокомпозиты, nanocomposites, glass transition temperature, polyimides, mechanical properties, температура стеклования, Ð¼ÐµÑ Ð°Ð½Ð¸Ñ‡ÐµÑÐºÐ¸Ðµ свойства, thermal stability

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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