A Study on the Radial Difference of PLA Monofilament

PLA monofilament has great potential for resorbable applications. In this paper, a series of PLA monofilaments with different drawing temperature and drawing ratio were prepared through melt spinning. The crystallization and radial difference of the cross section were carefully studied by DSC and Raman spectra, respectively. The results showed that the crystallinity increased with the increasing cooling time in the cooling process and increased with the decreasing drawing temperature or the increasing drawing ratio in the drawing process. The crystallinity of the core was higher than that of the surface. The molecular orientation of the core decreased with the increasing cooling time and increased with the increasing drawing temperature and the decreasing draw ratio, while there’s no significant tendency for the molecular orientation of the surface.