HEAT TREATMENT OF NYLON 3 FIBERS AND WET SPINNING OF NYLON 3 COPOLYMER

In order to improve the mechanical properties of nylon 3 fibers, especially to increase tensile elongation, the heat treatment were investigated. By treating drawn nylon 3 fibers in such media as hot silicone oil and hot air which were thought to have no interaction with polyamides, elongational properties were not improved. However, by treating the drawn nylon 3 fibers in such media as hot water, steam and hot glycerine which were thought to have some interaction with poly amides, elongational properties were improved. Further, the effects of spinning conditions, especially drawing conditions on the elongational properties of heat treated fibers were investigated. With increased drawing temperature and draw ratio, shrinkage of nylon 3 in boiling water was decreased. From these results a mechanism of hot water treatment of nylon 3 fibers was proposed. Mechanical properties of nylon 3 fibers obtained by heat treatment were as follows: strength; 2-3g/d, elongation; 20-30% Young's modulus; 800-1200kg/mm2.The copolymerization of nylon 3 and its wet spinning were also investigated to improve the mechanical properties. Relations between mechanical properties of nylon 3 fibers and its copolymer composition of nylon 3 fibers were discussed.