ABSTRACT
Abstract: Pure acrylic is brittle, tough and undyeable with any dye due to absence of reactive sites. Being a thermosetting manmade fibre, it cannot be dyed with disperse dye at high temperature to avoid formation of only light shades and tendering of fibre. Addition of co-monomers in polymerisation bath develops amorphousness, flexibility and introduces reactive site enabling it to dyeable at boil. Generally acidic co-monomers are added due to which all acrylic fibres are popularly dyed with basic dyes. Rapid opening of fibre throughout its Tg may be handled by either adding retarding agent in bath or controlling rate of heating.
