Abstract
This paper analyses the influence of processing temperatures of acrylonitrile butadiene styrene (ABS), polyamide 6.6 (PA 6.6) and polyoxymethylene (POM) on some mechanical properties when injecting items used in the automotive industry. The ABS specimens were made at the following injection temperatures: 220, 230, 240 and 250°C. The PA 6.6 specimens were made at the following injection temperatures: 280, 290, 300, 310 and 320°C. The POM specimens were made at the following injection temperatures: 180, 190, 200, and 210°C. The mechanical properties were measured using tensile tests, the Izod impact test and the Shore Durometer hardness test. It was observed that for these three polymers, the increase in processing temperature leads to insignificant changes in hardness. The Izod impact strengths of PA 6.6 and POM decrease to a minimum with an increase in processing temperature, while the further increase in processing temperatures leads to an increase in impact strength. Where ABS is concerned, the increase in processing temperature results in an increase in Izod impact strength. The tensile strength at break is influenced by the processing temperature. The highest tensile strength at break for ABS was recorded at 220°C, for PA 6.6 at 310°C and for POM at 200°C. The lowest values were recorded at the lowest and highest processing temperatures. Keywords: acrylonitrile butadiene styrene (ABS), polyamide 6.6 (PA 6.6), polyoxymethylene (POM), tensile tests, Izod impact test, Shore Durometer hardness test