Abstract
Combined solutions of cellulose and an acrylonitrile-based copolymer in N-methylmorpholine-N-oxide have been prepared for the first time, new composite fibers have been formed, and the properties of the solutions and fibers under standard conditions and during thermal treatment have been studied. On the basis of studying the phase state and morphological peculiarities of combined cellulose solutions with polyacrylonitrile additives, it has been shown that the completed solutions make emulsions in the entire range of investigated concentrations. The rheological behavior of combined solutions changes with temperature. With the use of IR spectroscopy methods, it has been found that the addition of polyacrylonitrile to cellulose results in the association of nitrile groups with hydroxyl groups of cellulose, which favors the cyclization of CN groups during heating and the appearance of polyconjugated bonds in polyacrylonitrile chains. Thermal transformations of cellulose and polyacrylonitrile in the course of mixed-fiber carbonization have been studied via DSC and TGA. It has been shown that polyacrylonitrile inhibits the dehydration processes in cellulose and reduces the intensity of the peak due to the first stage of the structural rearrangement, i.e., acts as a “catalyst” of pyrolysis.
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Original Russian Text © V.G. Kulichikhin, L.K. Golova, I.S. Makarov, G.N. Bondarenko, A.K. Berkovich, S.O. Ilyin, 2016, published in Vysokomolekulyarnye Soedineniya, Ser. C, 2016, Vol. 58, No. 1, pp. 81–92.
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Kulichikhin, V.G., Golova, L.K., Makarov, I.S. et al. Cellulose–co-polyacrylonitrile blends: Properties of combined solutions in N-metylmorpholine-N-oxide and the formation and thermolysis of composite fibers. Polym. Sci. Ser. C 58, 74–84 (2016). https://doi.org/10.1134/S1811238216010069
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DOI: https://doi.org/10.1134/S1811238216010069