Dye-fixing performances of slightly crosslinked poly(dimethyldiallylammonium chlorides) on cotton fabric

Abstract

Slightly cross-linked poly (dimethyldiallylammonium chlorides) (PDMDAACs) with different molecular weights characterized by intrinsic viscosities and structures were prepared as copolymers of triallylmethylammonium chloride (TAMAC), a cross-linking monomer, with dimethyldiallylammonium chloride (DMDAAC). They were then studied as novel, promising reactive polycationic dye-fixatives on cotton fabric. A series of slightly cross-linked PDMDAACs with controlled 1%–5% molar ratios of crosslinking units (TAMAC units) in the main chains and intrinsic viscosities of 0.04~0.86 dL/g were used to treat cotton fabrics dyed with anionic dyes such as Reactive Scarlet 3BS and Reactive Brilliant Blue KNR. Their dye-fixing performance, evaluated by dry rubbing fastness, wet rubbing fastness, colour fastness to soaping, and white fabric staining, were examined. The results showed their dye-fixing performances were affected by their intrinsic viscosities and the molar content of TAMAC units; slightly cross-linked PDMDAACs with intrinsic viscosities of 0.16-0.30 dL/g and 1% TAMAC exhibited the best dye-fixing performances and were better than all members of a group of selected widely-used commercial polycationic dye-fixatives. This was attributed to their plane-like structures and the nice balance between structure and intrinsic viscosities. Thus it was confirmed that the selected slightly cross-linked PDMDAACs can be used as novel dye-fixatives on cotton fabric.

Design and Controlled-Synthesis of Novel Slightly Crosslinked and Reactive Polycationic Dye-Fixatives for Cotton Fabric

“…modified dye-fixatives have been derived from the copolymerization of DMDAAC and one functional monomers with reactive 3-chloro-2-hydroxypropyl groups, which can bring about the covalent reactions with the hydroxyl groups of cotton (cellulose) to form a covering film on cotton surface, resulting in development on the fastness properties of dyes in turn 11,12 . Moreover, those slightly crosslinked PDMDAACs, derived from the copolymerization of DMDAAC and the lower contents (below 5 % molar contents) of crosslinking monomers (triallylmethylammonium chloride), can also exhibit better dye-fixing properties used as polycationic dye-fixatives, possibly due to the plane-like nature of crosslinking structures which would expand the interactions with dyes, resulting in the development of dye-fixing properties too 13,14 . In addition, our research also indicated that the fastness properties of resin dye-fixatives (polymer dye-fixatives) are affected by their molecular weights 15 and those PDMDAAC dye-fixatives with the controlled molecular weights characterized by intrinsic viscosities of 0.24-0.47 dL/g have been discovered to exhibit better dye-fixing properties, because their too low intrinsic viscosities would make the interactions with dyes very weak, resulting in the poor dye-fixing properties and too high intrinsic viscosities would make it difficult for them to be penetrated Asian Journal of Chemistry;Vol.…”