Abstract
Nylon 3 was-spun in the ethyl acetate coagulation bath, using formic acid as the dope solvent. Spinning conditions, especially the drawing conditions were investigated.
Boiling water, steam and glycerine, which are well-known drawing medias for ordinary polyamides were not suitable as the drawing media for nylon 3 fibers. While in such media as silicone oil, wood's metal or hot air, which are thought to have no interaction with polyamides, nylon 3 fibers were able to be stretched above the glass transition temperature (170_??_180°C). The drawn nylon fibers thus obtained showed fairly good mechanical properties as textile fibers, i. e. strength, 2_??_3g/d, elongation; 10_??_20%.
Relations between mechanical properteis and spinning conditions were also investigated. Mechanical properties of drawn nylon 3 fibers thus obtained were not so much affected by coagulation conditions and spinning dope conditions, but remarkably affected by drawing conditions.
