Abstract
Chemical transformations of PAN fibres “Bulana” (mass fractions: 93% acrylonitrile, 6% methylmethacrylate and 1% Na-vinylsulphonate) were studied as resulting from its treatment with hydrogen peroxide in alkaline medium, a first step of carbon fibre production. The reaction proceeds in formation of amide groups under the given experimental conditions. Simultaneously, cyclisation and network formation take place. The gel fraction is found to be 88%. As a result of the modification, a decrease in the temperature of initiation of the stabilizing reactions, as well as a decrease in the enthalpy ΔH from 885 J/g to 811 J/g are observed. The activation energy calculated by Kissinger's method is 148 kJ/mol in the case of the PAN fibres, and 108 kJ/mol for the treated fibres. The modification of PAN fibres by hydrogen peroxide in alkaline medium accelerates the next step of air oxidation. The modified PAN carbon fibres reach by oxidation their highest strength without shrinkage. The highest value is 1862 N/mm2 compared to 1274 N/mm2 for carbon fibres prepared from untreated PAN fibres.
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