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Влияние продолжительности изотермической выдержки на магнитные и структурные свойства продуктов химической карбонизации поливинилиденфторида

Влияние продолжительности изотермической выдержки на магнитные и структурные свойства продуктов химической карбонизации поливинилиденфторида

Abstract

Relevance of the work: Modern science and technology show interest to use of low-dimensional and nanodimensional materials based on carbon. One of the most prospective materials for synthesis of similar structures is poly (vinylidene fluoride). The same amount of fluorine and hydrogen in polymeric chains of this material allows achieving high extent of its dehydrofluorination by elimination of HF molecules. At gradual penetration of dehydrofluorinating chemical reagents in depth of a poly (vinylidene fluoride) film, carbon heterolayers are formed on its surface. They differ in residual fluorine content and electric conductivity. Such heterostructures with flexible polymeric basis substrate can be demanded by modern microelectronics. Therefore study of their physical and chemical properties seems to be urgent. The main aim of the research is to study the effect of isothermal annealing duration at 250 °C on magnetic and structural characteristics of poly (vinylidene fluoride) samples partially dehydrofluorinated via a chemical way. The methods used in the study: ESR-spectroscopy, differential thermal analysis, thermogravimetric and differential thermogravimetric analysis, X-ray diffraction. The results: The authors have developed the method for producing a new magnetically active carbon material on a poly (vinylidene fluoride) film surface. The parameters of ESR spectra of poly (vinylidene fluoride) samples partially dehydrofluorinated via a chemical way were measured. The samples were subjected to subsequent heat treatment at 250 °C with various duration of isothermal annealing. Based on the data of differential thermal analysis the assumptions are drawn on possible mechanism of regular elevation in paramagnetic centers content at increase in time of isothermal annealing.

Актуальность работы: Современные наука и технология проявляют интерес к использованию низкоразмерных и наноразмерных материалов на основе углерода. Одним из наиболее перспективных материалов для синтеза подобных структур является поливинилиденфторид. Одинаковое количество фтора и водорода в полимерных цепях данного материала позволяет добиться высокой степени его дегидрофторирования путём отщепления молекул фтористого водорода. В процессе постепенного проникновения дегидрофторирующих химических реагентов в глубину плёнки поливинилиденфторида на её поверхности происходит образование углеродных гетерослоёв, отличающихся содержанием остаточного фтора и величиной электрической проводимости. Такие гетероструктуры на гибкой полимерной основе могут быть востребованы современной микроэлектроникой. Поэтому изучение их физико-химических свойств представляется актуальным. Цель работы: Изучить влияние продолжительности изотермической выдержки при 250 °С на магнитные и структурные свойства образцов ПВДФ, частично дегидрофторированных химическим путём. Методы исследования: ЭПР-спектроскопия, дифференциальный термический, термогравиметрический и дифференциальный термогравиметрический анализ, рентгеновская дифрактометрия. Результаты: разработан способ получения на поверхности пленки поливинилиденфторида нового углеродного материала, обладающего магнитной активностью. Измерены параметры спектров ЭПР образцов частично дегидрофторированного химическим путём поливинилиденфторида, подвергнутых последующей термической обработке при 250 °С с различной продолжительностью изотермической выдержки. На основе данных дифференциального термического анализа сделаны предположения о возможном механизме монотонного роста концентрации парамагнитных центров при увеличении времени изотермического отжига.

Keywords

ПОЛИВИНИЛИДЕНФТОРИД, ЭЛЕКТРОННЫЙ ПАРАМАГНИТНЫЙ РЕЗОНАНС (ЭПР), ДИФФЕРЕНЦИАЛЬНЫЙ ТЕРМИЧЕСКИЙ АНАЛИЗ, РЕНТГЕНОВСКАЯ ДИФРАКТОМЕТРИЯ, ДЕГИДРОФТОРИРОВАНИЕ, ИЗОТЕРМИЧЕСКИЙ ОТЖИГ, POLY (VINYLIDENE FLUORIDE), ELECTRON SPIN RESONANCE (ESR)

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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!
0
Average
Average
Average