Influence of High Shearing Stress-Induced Strengthen Effect on GF/HDPE Composites
For the short glass fiber reinforced high density polyethylene (HDPE), a high shearing stress-induced HDPE and MAH functional reaction method was introduced which was achieved by increasing the twin screw extruder rotation speed during melting extrusion process. The results show that the graft degree of consequent HDPE-g(b)-MAH product has been increased from 0.14% of the thermal-induced one to 0.77% by the high shearing stress-induced one when the rotation speed of the screw increases from 100r/min to 800r/min. Therefore, the mechanical properties of the GF/HDPE composites are greatly improved, namely, its tensile-strength, bending-strength and the notch impact absorbed work are increased from 21.43MPa, 15.49MPa and 12.82kJ/m2 to 30.18MPa, 29.72MPa and 19.12kJ/m2 respectively. The corresponding simulations through the commercial Moldflow soft show a good agreement with these experimental data.
Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou
G. Z. Dai et al., "Influence of High Shearing Stress-Induced Strengthen Effect on GF/HDPE Composites", Materials Science Forum, Vols. 575-578, pp. 1123-1128, 2008