Prediction of the failure strength of polypropylene/polyamide 1010 blend

By defining a minimum volume fraction of polypropylene phase, beyond which the polypropylene phase will control the strength of the blends, the ultimate failure strengths of the polypropylene/polyamide 1010 (PP/PA1010) blends were predicted in terms of the components properties. Test results showed a lowest strength when V(PP)/V(PA1010) = 40/60 and V(PP)/V(PP-g-MAH)/V(PA1010) = 60/5/40. The minimum fraction calculated was found, close to the phase inversion region determined by observing the blends morphologies. It is confirmed that the blends have a stationary mechanical property at the phase inversion region, and the PP-g-MAH incorporated into the PP/PA1010 can enhance the ultimate failure strength of the blends. A good agreement between the prediction and experimental is also found in the PP/PP-g-MAH/PA 1010 when the blends has more V(PA1010) than 40%.