PA6-based Polymerization Blends Compatibility And Tensile Behavior

The compatibility of the polymer is a key factor in determining the interfacial structure,morphology properties and mechanical properties of the polymer blends.Similarly,some of the mechanical behavior of the polymer blend,to a certain extent,also reflects the compatibility between the blending components.Because of easy and convenience,tensile test is the most simple method to characterize mechanical properties.Therefore,it has certain theoretical and practical significance to study the relationship between the behavior and the compatibility of the polymer by using the tensile stress-strain curve of the polymer blend.In this paper,a series of blends were prepared by melt blending with reactive compatibilizers such as PP-g-MAH,EPDM-g-MAH,SMA and SAN-g-MAH.The stress-strain curves of the blends at different temperatures were studied.The tensile behavior of the blends at different temperatures was studied.It was found that the tensile behavior of the blends was correlated with the system compatibility and the compatibility of the blends was verified by scanning electron microscopy(SEM),dynamic thermal analysis(DMA),Torque rheometer and Molau experiment.Firstly,the stress-strain curves of PA6/PP at different blending ratios were studied.The relationship between the tensile behavior and the compatibility of PA6/PP was investigated.From the stress-strain curve of the blend,it can be seen that the tensile strength and elongation at break of the blend decrease regularly with the increase of the content of the dispersed phase PP.The results of DMA and SEM showed that the compatibility of PA6/PP blends gradually improved with the increase of PP content.Further,the necking-deformation energy(Qd)of PA6 / PP blends was defined and calculated.It was found that the higher the Qd of PA6 / PP blends with different compositions,the better the compatibility of the blends.Secondly,the semi-crystalline/crystalline blends PA6/PP with PP-g-MAH and EPDM-g-MAH were prepared.The tensile behavior of the blends was studied at different tensile temperatures and the improvement of compatibility of blends with different compatibilizers were discussed.The tensile behavior of the blends at different temperatures indicates that the compatibilizer can significantly increase the tensile strength and elongation at break and the blends with PP-g-MAH compatibilizer have the largest tensile strength and elongation at break.The SEM,torque rheometer,Molau experiment show that the addition of reactive compatibilizercan improve the compatibility of PA6/PP/blends,and the compatibilizer PP-g-MAH is more effective than EPDM-g-MAH on the system capacity.The results of necking-deformation energy show that the higher the Qd,the better the compatibility of the blends in the compatibilized PA6 / PP blends.Finally,the PA6/ABS(semi-crystalline/amorphous)blends with SMA and SAN-g-MAH were prapared.The stress-strain behavior of the blends was studied by controlling the tensile test temperature.The tensile behavior of the blends at different temperatures indicates that the tensile strength and elongation at break which were added with compatibilizer were significantly increased,and the blend system with SMA has the greatest tensile strength and elongation at break.SEM,torque rheometer and Molau test showed that the addition of reactive compatibilizer effectively improved the compatibility of PA6/ABS blends,and the compatibilizer SMA has better effect than that of SAN-g-MAH.The results of necking-deformation energy show that the higher the Qd,the better the compatibility of the blends in the compatibilized PA6/ABS blends.