Özet:

The effect of injection process conditions on the cell structure and mechanical properties of talc and ethylene-propylene-diene-monomer (EPDM) filled polypropylene (T-EPDM-PP) composite foams was investigated. Different process conditions such as injection pressure, feedback pressure, injection speed and melting temperature were used. Tensile test and impact test were performed to determine the mechanical properties of the foam materials. In order to compare the mechanical properties, unfomed T-EPDM-PP polymer composite samples were also produced. Obtained experimental data were analyzed using the Taguchi method. The cell morphology of the foams was investigated in terms of skin layer thickness, cell size and cell density using a stereomicroscope, depending on different process conditions. With the increase of injection pressure, injection speed and melting temperature, the tensile and impact strengths of foam samples decreased, while it increased with the increase of the feedback pressure. The tensile and impact strengths of the composite foam increased with the increase in skin layer thickness. Cell size decreased with increasing E.B and EB. High cell density was obtained when low feedback pressure and melting temperature were used together with high injection pressure and injection speed. Foam density decreased with increasing E.B, E.H and E.S. In order to obtain high tensile and impact strength in T-EPDM-PP based composite foam production, optimum process parameters were determined as feedback pressure 100 bar, melting temperature 160 oC, injection speed 60 mm/s and injection pressure 60 bar.

Anahtar Kelimeler: