Influence of the additive type and modification on the properties of blends of polyamide-6 with poly(styrene-co-maleic anhydride)

Addition of rigid poly(styrene-co-maleic anhydride) (SMA) to a polyamide-6 (PA-6) matrix leads to a system with increased stiffness and unchanged toug hness as a consequence of absorption of deformational energy by the plastic deformation of brittle inclusions together with the matrix. The range of p roperties of both components, where this effect occurs, was studied. In add ition to the use of various PA-6 and SMA types, PA-6 was also modified with epoxy resin, as well as SMA with liquid rubber bearing amino groups. Owing to the crosslinking ability of both modifiers, the influence of the change d deformability of blend components was demonstrated. Simultaneous influenc ing of rheological properties and reduction of the amount of reactive group s usable for the in situ compatibilizer formation make it possible to vary the size of dispersed SMA particles and the interfacial adhesion. Thus, a m ore comprehensive insight into the behavior of ductile-brittle blends is ga ined. As SMA and modifiers have negative effect on the PA-6 crystallinity, comparison of the obtained data with model calculations is difficult.