The Thermal Behavior of Lyocell Fibers Containing Bis(trimethylsilyl)acetyleneстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 8 апреля 2021 г.
Аннотация:This study focuses on the preparation of carbon fiber precursors from solutions of cellulosein N-methylmorpholine-N-oxide with the addition of bis(trimethylsilyl)acetylene, studying their structural features and evaluating thermal behavior. The introduction of a silicon-containingadditive into cellulose leads to an increase in the carbon yield during carbonization of compositeprecursors. The type of the observed peaks on the differential scanning calorimetry (DSC) curvescardinally changes from endo peaks intrinsic for cellulose fibers to the combination of endo andexo peaks for composite fibers. For the first time, coefficient of thermal expansion (CTE) valueswere obtained for Lyocell fibers and composite fibers with bis(trimethylsilyl)acetylene (BTMSA). The study of the dependence of linear dimensions of the heat treatment fibers on temperature made itpossible to determine the relation between thermal expansion coefficients of carbonized fibers andthermogravimetric curves, as well as to reveal the relationship between fiber shrinkage and BTMSAbis(trimethylsilyl)acetylene content. Carbon fibers from composite precursors are obtained at a processing temperature of 1200 C. A study of the structure of carbon fibers by X-ray diffraction, Raman spectroscopy, and transmission electron microscopy made it possible to determine the amorphous structure of the fibers obtained.