Preparation And Properties Of Oil Resistance Polyamide-6/Nitrile Rubber Blends

The mechanical properties and solvent resistance of Polyamide-6/nitrile-butadiene rubber (PA6/NBR) blends, prepared via melt blending, were studied. The influence of the varieties of component for NBR, on the crystallization property of PA6/NBR blends was investigated by means of polarized light microscopy (PLM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC).The results show that the melt viscosity and the equilibrium torque of the blends increased significantly with increasing content of NBR from0%to80%. Tensile strength of PA6/NBR blends increased with increasing the content of nitrile. With increasing content of NBR from10%to40%, while tensile strength decreased from41.2to11.7. After achieving the swelling equilibrium, volume swelling ratio of PA6/NBR blends increased from3.9%to364.7%and quality swelling ratio of PA6/NBR blends increased from6.1%to350.1%. With decreasing content of nitrile solvent resistance reduced. The results of IR showed that there was chemical reaction between NBR and PA6at high temperature and strong shear action.The crystalline properties of the mixture results the polymorphs of PA6were changed from y to a when the NBR was mixed in. Crystallization of PA6in blends decreased with increasing content of NBR. When NBR content increased up to80%, moleculars interaction between NBR and PA6obstructs the crystallization process of PA6. In comparison with the polarizing microscope photographs, the dimension of PA6/NBR blends spherulites minished with NBR content increased, and the spherulite size gradually fuzzier at the same time. In this work, it has been proved that high content NBR will prevent the crystallization process of PA6.