Abstract
Comparative studies of the structure and thermal behavior of cellulose and composite precursors with additives of silyl-substituted acetylene and alkoxysilanes were carried out. It is shown that the introduction of silicon-containing additives into the cellulose matrix influenced the thermal behavior of the composite fibers and the carbon yield after carbonization. Comparison of the activation energies of the thermal decomposition reaction renders it possible to determine the type of additive and its concentration, which reduces the energy necessary for pyrolysis. It is shown that the C/O ratio in the additive and the presence of the Si–C bond affected the activation energy and the temperature of the beginning and the end of the pyrolysis reaction.
Highlights
By means of the solid phase dissolution of cellulose in N-methylmorpholine-N-oxide (NMMO), a direct solvent for cellulose, it is possible to obtain highly concentrated solutions and to spin the Lyocell-type fibers [1]
Catalysts of pyrolysis and flame retardants can be applied by impregnation of the precursor fibers with solutions of active substances followed by their drying [7,8]
We report that the addition of silyl-substituted acetylene and alkoxysilanes into the cellulose matrix led to a decrease in the activation energy
Summary
By means of the solid phase dissolution of cellulose in N-methylmorpholine-N-oxide (NMMO), a direct solvent for cellulose, it is possible to obtain highly concentrated solutions and to spin the Lyocell-type fibers [1]. These fibers have attracted a lot of attention, as an alternative to rayon textile material, and as precursors of carbon fibers [2]. Silicon-containing catalysts have been proposed as an alternative to these active agents Their use allows carbon fibers with a mechanical strength of more than 1 Gpa to be obtained. In [9,10,11,12,13,14], predominant data were given on the use of silicon-containing compounds for obtaining carbon fiber, in particular, in [10], the application of Tetraethoxysilane (TEOS) makes it possible to obtain carbon fibers with a diameter of
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