Modification of polyacrylonitrile fibers with hydrazine and hydroxylamine in aqueous medium

Abstract

AbstractThe interaction between polyacrylonitrile (PAN) fibers and hydrazine and/or hydroxylamine in aqueous medium was investigated. The kinetics of the reaction was studied and a step‐like effect was found, testifying to a diffusion‐controlled stage. The Michaelis‐Menten kinetics was used for the description of the initial stage of the reaction. On the basis of the results and the analytical data the mechanism of the process was discussed. By studying the basic physical and physico‐mechanical indices of the fibers it was found that the chemical modification with these bases and a subsequent processing with aqueous solutions of copper salts takes place with notable changes in structure and properties of the fibers. The results obtained lead to improved methods for the production of fibers with chemical resistance and improved fire resistance.