Abdulkadir GÜLLÜ, Metin GÜRÜ, Abdulmecit GÜLDAŞ, Adem ÇANKAYA

DETERMINATION OF RHEOLOGICAL PROPERTIES OF ZINC BORATE REINFORCED POLYPROPYLENE

In this study reinforced polypropylene granules have been produced by the way zinc borate are added to powder polypropylene material at the rate of 5 %, 7.5 %, 11.25 %, 16.875 % and 25.3125 %. To prevent oxidation, at the rate of 0.2 % maleic anhidrit as a antioxidant has been added to PP during the production of zinc borate reinforced polypropylene granule. After composite granule was produced, rheological properties of reinforced polypropylene have been determined by using melt flow index device (MFI). MFI, shear stress, shear rate and viscosity values have been obtained by the experiments that was carried out under four different load (298.2 kPa, 524 kPa, 689.5 kPa and 987.4 kPa) and four different temperature (190 o C, 200 o C, 210 o C and 220 o C). According to this study, it has been determined that viscosity value increased depending on zinc borate rate but viscosity decreases depending on increasing temperature and pressure. It was determined that MFI values have been increased depending on increasing temperature and pressure whereas MFI values have been decreased according to increasing zinc borate rate. In addition, it has been seen that shear rate decreases depending on increasing proportion of additive but it increases with the increase of temperature and pressure.

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