Peculiarities of the initial stages of carbonization processes in polyimide-based nanocomposite films containing carbon nanoparticles

0507451 - ÚSMH 2020 RIV NO eng J - Článek v odborném periodiku
Gofman, I. V. - Balík, Karel - Černý, Martin - Žaloudková, Margit - Goikhman, M. Y. - Yudin, V. E.
Peculiarities of the initial stages of carbonization processes in polyimide-based nanocomposite films containing carbon nanoparticles.
Cogent chemistry. Roč. 1, č. 1 (2015), č. článku 1076712. ISSN 2331-2009
Institucionální podpora: RVO:67985891
Klíčová slova: carbonization * polyimides * nanocomposite films * carbon nanocones/disks * vapor grown carbon fibers
Obor OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Způsob publikování: Open access
https://www.cogentoa.com/article/10.1080/23312009.2015.1076712.pdf

Carbonization of the polyimide-based composite films containing carbon nanoparticles, namely nanofibers and nanocones/disks, in the temperature range 500-550 degrees C was studied and the kinetics of the initial stage of carbonization and the effect of the filler on the mechanical properties of the carbonized films were evaluated. Two polyimides (PIs) characterized by different macrochains' rigidity and different degrees of ordering of the intermolecular structure were used. The character of the nanofiller's action on the kinetics of the carbonization process depends on the heating rate. In this work, the intensity of the destruction of the PI matrix of the composite films was shown to be slightly higher than that of films of the same polymers with no filler. The introduction of the carbon nanoparticles into both PIs provokes the increase in the ultimate deformation values of the partially carbonized films, while the carbonization of the unfilled PI films yields the brittle materials. The Young's modulus values of the materials based on the rigid-rod PI do not increase after carbonization, while those for compositions based on the PI with semi-rigid chains increase substantially. Carbon nanocones/disks are characterized by the best compatibility with matrix PIs in comparison with carbon nanofibers.
Trvalý link: http://hdl.handle.net/11104/0300208