The Studies Of Polyamide 6/elastomer/inorganic Rigid Particles

Lots of researchs about toughened and strengthened polyamide 6 resin had been reported. But the research about influences on the performance of polyamide 6 by rigid inorganic particles with different morphologies was rare. Many researchs were mainly concentrated on the blends of treated calcium carbonate particals and polyamide 6.The thesis used wollastonite,CaCO3 and talc as fillers and blended them with POE-g-MAH and polyamide 6. After blended and extruded, the mixture of the rigid inorganic particles, PA6/POE-g-MAH and PA6 was injected and molded to be standard specimens for performance test. Influences of the percentage, components of rigid inorganic particles and POE-g-MAH on the mechanical properties of PA6 composites were systematically studied. Analysised the relationships between the blends' microstructure and macroproperties by the methods of SEM,DSC and X-ray diffraction.The results showed that the notched impact strength of PA6/POE-g-MAH was enhanced as the quantity of POE-g-MAH raised. The blends of PA6 and POE-g-MAH showed the brittle-ductile transition.The addition of acicular wollastonite and flaky talc reduced the notched impact strength of blends significantly. The notched impact strength of PA6/POE-g-MAH/wollastonite (85/15/2) is lower than that of PA6/POE-g-MAH (85/15) by 70%; The notched impact strength of PA6/POE-g-MAH/talc (85/15/2) is lower than that of PA6/POE-g-MAH (85/15) by 81%. But the addition of CaCO3 maitained the notched impact strength better than that of wollastonite and talc. The notched impact strength of PA6/POE-g-MAH/CaCO3 (85/15/2) is lower than that of PA6/POE-g-MAH (85/15) by 57%.These three particals had not been pre-treated, so the bonding strength between the particals and matrix is weak. Thus the addition of particals decreased the notched impact strength of the blends. Due to the microstructure of calcium carbonate which is similar to the sphere. The force of the matrix focused on poles of the calcium carbonate particles was tensile stress while the force near the equator was compressive stress. Because of the detachment of particals and matrix, holes around the particals appeared. Thus it prevented the fracture crack propagation and absorbed a lot of energy, so it had less influence on the notched impact strength of blends than the other two particals.The trends and changes of the datas of blends were proved by the method of SEM,DSC and X-ray diffraction. The addition of rigid inorganic particles changed the crystallinity of the blends and the crystal habit. So the microstructure changes determined the macromechanics of the blends.