Influence of activation modes on the specific surface and development of a microporous structure of viscose-based carbon fibers

Abstract

Specific surface and porous structure of carbon fibers based on viscose produced by the Krasnoyarsk Plant of Chemical Fibers are investigated by low-temperature nitrogen absorption using an ASAP 2020 device. The dependence of their specific surface and character of the pore-size distribution on the modes of gas-phase activation in the carbon dioxide stream at 900°C is shown. It is established that the adsorption surface of carbon fibers can grow from 0,3 to 1900 m2/g in the course of activation. It is revealed that an increase in the activation time leads to an increase in the specific surface of fibers due to the appearance of numerous new micropores and development of the microporous structure.