The addition of maleic anhydride grafted polybutadiene (PB-g-MAH) can greatly improve the compatibility of polyamide 66 (PA66)/acrylonitrile-butadiene-styrene copolymer (ABS) blends. Unlike the commonly used compatibilizers in polyamide/ABS blends, PB-g-MAH is compatible with the ABS particles' core phase polybutadiene (PB), rather than the shell styrene-acrylonitrile (SAN). The compatibility and interaction of the components in the blends were characterized by Fourier transform-infrared spectra (FTIR), Molau tests, melt flow index (MFI), dynamic mechanical analyses (DMA), and scanning electron microscopic (SEM) observations. The results show that PB-g-MAH can react with the amino end groups in PA66 while entangle with the PB phase in ABS. In this way, the compatibilizer anchors at the interface of PA66/ABS blend. The morphology study of the fracture sections before and after tensile test reveals that the ABS particles were dispersed uniformly in the PA66 matrix and the interfacial adhesion between PA66 and ABS was increased significantly. The mechanical properties of the blends thus were enhanced with the improving of the compatibility. POLYM. ENG. SCI.,
The polyamide 66 (PA66)/poly(hydroxyl ether of bisphenol A) (PHE) blend was successfully prepared by twin-screw extrusion without the addition of any compatibilizer. The PA66/PHE blends had a microphase-separated structure that varied from a sea-island structure to a cocontinuous structure, and the mechanical properties were higher than the anticipated values on the basis of the rule of mixtures, which showed a synergistic effect. Fourier transform infrared spectroscopy and dynamic mechanical analysis illustrated that there was hydrogen-bonding interaction between the amide groups of the PA66 and the pendant hydroxyl groups of the PHE. This led to the some degree of compatibility and the improvement in the mechanical properties of the blends. The polarized optical microscopy observation showed that the PA66 spherulites of the blend became smaller and more imperfect compared to those of the pure PA66, and differential scanning calorimetry measurement also showed a decrease in the melting temperatures of PA66 of the blend.
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