Rheological and thermal properties of polyamide 6 and polyamide 6/glass fiber composite with repeated extrusion

Abstract

In this study, the rheological, mechanical, and thermal properties of polyamide 6 (PA6) and PA6/glass fiber (GF) composite with repeated extrusions were investigated. The complex viscosity of the PA6 was found to decrease with the increase of repeated extrusion. The decrease in complex viscosity was due to the decrease in the molecular weights of the PA6. The decrease in tensile strength of the PA6(GF) was due to the continuous chopping of the glass fibers with repeated extrusion, as well as the decrease in molecular weight of the PA6. The half crystallization time of the PA6 and PA6(GF) decreased, with the increase of repeated extrusion. The fraction of the 1-time repeated extrusion of the PA6 (PA6-A) in the PA6/PA6-A blend was obtained from the ratio of the complex viscosity of the PA6-A blend, and the complex viscosity of the PA6. A rheological method is presented that can estimate the fraction of the repeated extrusion of the polymer from the virgin polymer/repeated extrusion of the polymer mixtures.