Soheil Farshbaf Taghinejad - Iran Petrochemical and Polymer Institute, Tehran, Iran.
Mina Behrouzi - National Petrochemical Company (NPC), Research and Technology Company, Tehran, Iran..
Saeed Asiaban - National Petrochemical Company (NPC), Research and Technology Company, Tehran, Iran..

At oscillatory rheometry method in linear viscoelastic region, storage and loss modulus vs.frequency graph of ABS at molten state has two crossover points (COP). First COP increases while TiO2 content arises up to 1.5% in Cristal 134 pigmented ABS samples. By arising TiO2 firstCOP dramatically decreases because of agglomeration of the pigments. TEM micrographs approve that agglomerates of Cristal 134 particles are formed above 1.5% content. Therefore, shifting of first COP as a rheological parameter could be applied as a criterion to specify dispersion quality of TiO2 particles in ABS matrix

Polymer rheology, Compounding, Pigments, Titanium dioxide, ABS