Extrusion International USA 5-2020

42 Extrusion International 5/2020 EXTRUSION INTERNATIONAL There was a small reduction in the Tm of the material to 162ºC, and a large reduction in the degree of crystallin- ity. In the sequence, the enthalpy results of the materials are shown in the DSC tests (Figure 6), degree of crystallinity (Figure 7) and a graph with a theoretical study of the be- havior of other proportions of the same mixture based on the results already obtained. Conclusion Based on the results of the studies carried out, it was concluded that the blends studied presented an excel- lent performance. The compatibility and miscibility were proven through the DSC test and the variations in prop- erties were small and acceptable for the applications where the blends can be used. During the processing of the materials, to manufacture the specimens used in the tests, there was an interesting homogeneity between the materials, without any prob- lems in their processing. The studied blends: 70/30 and 60/40, and 50/50, presented satisfactory performance in all aspects studied. Considering the results, the technical, structural and functional part, it is possible to use all proportions, in the substitution of the Noryl PPX for making shocks for bus- es. The 50/50 blend stands out for presenting the most competitive cost among the blends studied, when com- pared to the cost of pure Noryl PPX, with this new ma- terial, we will be able to bring again the long-awaited economic viability to the manufacturers of products that are currently produced with 100 % Noryl PPX pure. In the mechanical tests, the 50/50 blend had a per- formance very close to the pure Noryl PPX, showed a reduction in viscosity and a significant increase in crystallinity due to the increase in the proportion of polypropylene. The Author: Jean Zolet is an engineer specializing in polymeric materials. At the age of 39, Jean Zolet lives in the city of São José dos Pinhais, in the Brazilian state of Paraná. Figure 4: DSC Graph – 50%Polypropylene 50%Noryl PP Figure 5: DSC Graph – 100%Noryl PPX Figure 3: DSC Chart – 40%Polypropylene 60%Noryl PPX Figure 6: Graph for comparison of enthalpy of crystalline fusion of the materials Figure 7: Graph for comparing the crystallinity of the materials (%)