Effect of PPO-g-MA on Structures and Properties of PPO/PA6/Short Glass Fiber Composites

摘要

Poly(2,6-dimethyl-1,4-phenylene oxide)/polyamide 6 (PPO/PA6) blendswere reactively compatibilized by maleic anhydride (MA) grafted PPO (PPO-g-MA)and reinforced by short glass fibers (SGF) via melt extrusion. An observation of theSGF-polymer interface by scanning electronic microscope (SEM) together with etch-ing techniques indicated that the PPO-g-MA played a decisive role in the adhesion ofpolymers to SGF. The rheological behavior was investigated by capillary rheometer,and the addition of PPO-g-MA, and SGF could increase the viscosity of the PPO/PA6blends. The analysis of fiber orientation and distribution in the PPO/PA6/SGF compo-sites showed PPO-g-MA favored to the random dispersion of SGF. The statistic anal-ysis of SGF length showed that PPO-g-MA was helpful to maintain the fiber lengthduring melt-processing. For the composites at a given SGF content of 30 wt %, theaddition of PPO-g-MA increased the tensile strength from 59.4 MPa to 97.1 MPa andincreased SGF efficiency factor from 0.028 to 0.132. The experimental data were con-sistent with the theoretical predictions of the extension of Kelly-Tyson model for ten-sile strength. The fracture toughness of the composites was investigated by singleedge notch three-point bending test.