Abstract
A method is suggested for kinetic investigation of the pyrolysis of intercrystallite amorphous portions of cellulose hydrate fibres, using low and wide angle X-ray scattering data. The activation energy E 2 obtained by this method for the pyrolysis of intercrystallite amorphous portions of cellulose hydrate fibres is 52±2 kcal/mole, which is equal to the value of E a for the initial stage of pyrolysis of the fibre as a whole, based on isotherms of weight loss for T ⪕ 290°. The initial stages of pyrolysis of the fibre at higher temperatures are characterized by E a = 30 kcal/mole. The reduction in E a at T ⪖ 290° is associated with a larger role played by processes of surface degradation, which is corroborated by a change in the fibre diameter as a result of pyrolysis.
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