Mechanical characterization of toughened polyamide‐6 blends with metallocene copolymers

Abstract

ABSTRACT:The effectiveness as impact modifier of two in situ maleated metallocene copolymers, a metallocene polyethylene, (mPE1) and a metallocene ethylene-propylene (mEPDM) and three commercial maleated copolymers (mPE2-g-MA, EPDM-g-MA, and mEPR-g-MA) were studied in binary and ternary blends carried out in an intermeshing corotating twin-screw extruder with polyamide-6 (PA) as matrix (80 wt %). Also, the effects of the grafting degree, viscosity ratio, and crystallinity of the dispersed phases on the morphological and mechanical properties of the blends were investigated. A significant improvement of the compatibility of these grafted copolymers with PA6 was shown by FTIR spectroscopy, capillary rheometry, and scanning electron microscopy (SEM) in all reactive blends. The tensile strength values of the mEPRg-MA/PA2 binary blend showed the highest strain hardening. The results obtained in this work indicated that the effectiveness of the grafted copolymers as impact modifier depends on the morphology of the blends and a combination of tensile properties of the blend components such as Young's modulus, Poisson ratio, and break stress.

Polyamide-6/Poly(lactic acid) Blends Compatibilized by the Maleic Anhydride Grafted Polyethylene-Octene Elastomer

“…It has been established that the absorbance of the carbonyl groups is from 1698 to 1856 cm À1 [15] . The absorbance peaks in 1786 cm À1 is thus the characteristic absorbance of carbonyl group, i.e., the characteristic absorbance peak of acid anhydride, which is associated to the stretching vibrations of the C = O bond in MAH [16] . This result confirms that MAH is grafted onto POE successfully.…”