Abstract
Several diamine/acid salts were reacted with Nylon 6 in melt state to increase ammonium terminal groups in Nylon 6. Especially, 1, 6-diaminohexane/methanesulfonic acid (1: 2) salt was found to be the most effective for this terminal modification. When its molar ratio was 1.2 relative to the terminal carboxyl groups of Nylon 6, a significant amount of the ammonium-sulfonate groups were introduced without decreasing the solution viscosity of polymer. Various model reactions revealed that the diamine/acid salts can react with the terminal carboxyl groups or the inner amide groups of Nylon 6 to form the ammonium terminal groups. The same terminal modification was possible when the diamine salts were added to the polymerization system of e-caprolactam. The reaction product of Nylon 6 and 1, 6-diaminohexane/methanesulfonic acid (1: 2) salt was melt-spun into a filament. Its dyeability to acidic dye was found to be very high even in a neutral bath because of increased ammonium terminal groups. This filament was then mixed with the formerly prepared s-triszine-terminated filaments and the original Nylon 6 filament, and the filament mixture was dyed in a mixed bath containing both acidic and basic dyes for cross dyeing. Each of the filaments was dyed with the corresponding dyes separately. This technique should be economically useful in dyeing industry and can be applied to the industrial production of new functional Nylon fiber or plastics. t Studies on Functionalizatio no f Polymers by Reactive Processing. Part 4.
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