Crystallinity and orientation of PGLA fiber during drawing

For better control of mechanical properties and degradation characteristics of poly(glycolide-co-l-lactide)(PGLA) fiber,the influences of drawing on the crystallinity and orientation of PGLA fiber were studied.It was found that as the drawing condition changes,the crystallinity of PGLA fiber presents a section-based linear transformation rule markedly.The strain-induced crystallization dominates the crystal formation during fiber drawing.Under the experimental conditions,kinetics varies with stages during crystallization process.Owing to the fact that there is positive correlation between the amorphous orientation function and the crystallinity and considering the peaks of cold crystallization vary with drawing conditions,as shown by DSC,it is suggested that the crystallization mechanism of PGLA fiber during drawing is strain-induced crystallization.