Graphitized Carbon Fibers Based on Lyocell Precursorsстатья
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Дата последнего поиска статьи во внешних источниках: 28 февраля 2020 г.
Аннотация:For the first time, graphitized fibers from Lyocell cellulose precursors spun from solutions prepared via the solid-phase dissolution method in N-methylmorpholine-N-oxide were obtained. Carbonization was performed up to processing temperature of 2400 °C. Comparative studies of cellulose precursors and carbon fibers, carried out by means of scanning and transmission electron microscopy, X-ray and thermal analysis, allowed us to establish the structural-morphological features and thermophysical properties of carbon fibers. It is shown that graphitized fibers consist of randomly arranged regular lamellae of graphite-like layers. Using transmission electron microscopy, the interplanar distance between the layers (d002) was estimated to be ~ 0.341 nm. Graphitization of the fibers leads to content of carbon ~99.75% and oxygen ~0.25% and to reach the tensile strength up to 1.5 GPa.