Structural, Physicomechanical, and Sorption Properties of Ternary Acrylonitrile Copolymer Fibres

When itaconic acid (IA) is replaced by vinylcaprolactam (VCL) in ternary AN:MA:IA (acrylonitrile:methyl acrylate:itaconic acid) copolymers, fibres similar in structure to industrial Nitron fibre are obtained, and they have a higher capacity for orientation the larger the amount of VCL added to the copolymer. The fibres obtained have higher physicomechanical properties and higher hydrophilicity and dyeability with disperse dyes than Nitron fibres. The values of the diffusion coefficient of equilibrium-sorbed dye, activation energy, and some thermodynamic properties are calculated. An increase in the VCL content in the copolymer and an increase in the temperature cause an increase in the degree of fixation of the disperse dye in the fibre. In ordinary dyeing conditions, a high residual dye content in the fibre can be attained.