Following the holding of the 4th International Conference on Rheology, Arsam Plast Raz also participated in this conference by presenting one poster and one oral presentation.
The paper related to the oral presentation, which was prepared by Mr. Amirhossein Arjmandfard and Mr. Afshin Tavasoli, was focused on “Characterization of Residence Time Distribution of Materials in a Co-Rotating Twin-Screw Extruder.”
In this paper, an attempt was made to determine the residence time of materials and its distribution in the extruder by using practical operational approaches, such as extracting and comparing the color parameters of images taken from the extruded strands at short time intervals, in which color changes occurred due to the addition of a colored masterbatch. As is evident, the materials added to the extruder (even when added instantaneously) do not exit at the same time and with the same concentration; rather, this process occurs over time, and the outlet concentration varies at different times. The resulting output curves obtained from conducting this test have many applications, especially in reactive extruders, where the residence time of materials inside the extruder determines the extent of reaction progress and the properties of the resulting material. By obtaining this curve for each extruder, the processing conditions can be optimized and the properties of the resulting materials can be improved.
The other paper, which was presented as a poster, was prepared by Mr. Mirmahan Ghaffari Emam and Mr. Saeed Naserian, and was focused on “The Effect of Nanoclay on the Rheological Properties of Polybenzoxazine/Nanoclay Nanocomposites”
In this paper, an attempt was made to investigate the effect of the presence of surface-modified nanoclay on the viscosity of polybenzoxazine as a polymer with special properties. Based on the tests conducted in this research, it was determined that the presence of 3% nanoclay dispersed in the polybenzoxazine matrix leads to improvement in rheological properties in terms of viscosity parameters and pseudoplastic behavior, and optimizes thermal resistance and impact resistance. The investigations were carried out using the Cross model, and based on the calculations of this analytical model, it was determined that the optimal percentage of nanoclay leads to improved flowability and processability in polybenzoxazine polymer.
