IMPACT BEHAVIOR OF MODIFIED TALC FILLED PP LDPE BLENDS/

The effect of a titanate coupling agent (KR-11) modified talc on the i mpact behaviour of PP/LDPE blends has been studied. The impact strengt h mainly depends on matrix composition and hardly varies with the talc content. Only at high filler percentages (above 37%) a significant de crease has been observed. In comparison with the unmodified talc fille d composites, it can be deduced that, in general, the impact strength does not increase with the filler organophilization except in the case of composites with LDPE/PP ratios above 3 in the matrix composition a nd talc contents between 20-35% in the composite. From scanning electr on microscope observations it can be suggested that the organophilizat ion of the talc tends to improve the wettability of this filler by the polymer matrix, and a higher affinity between the organophilized talc particles and the PP can be observed.