Bio-based polyamide 56 fibers by one-step melt-spinning: Process, structure and properties

Polyamide 56 (PA56) fibers were prepared by one-step melt spinning and drawing process. The effects of draw ratio and draw temperature on the structure and properties of PA56 fibers were investigated. Both alpha-like-and gamma-crystalline phases were formed in PA56 fibers. An increase in the draw ratio at a given draw temperature leads to the significantly increase in crystallinity, chain orientation, and the content of the alpha-like crystalline phase in the resultant PA56 fibers. The crystallinity and orientation parameters of the PA56 fibers increase with draw temperature in the range of 130-190 degrees C. The PA56 alpha-like crystalline phase is unfavorable at a higher draw temperature. The optimal process parameters for PA56 fibers with good mechanical properties are at draw ratio above 3 and with a draw temperature in the range of 150-190 degrees C.