<正>Different Ziegler-Natta catalysts were employed to polymerize ethylene. To investigate the influences of reaction parameters

namely Al/Ti molar ratio

hydrogen and processing parameters

i.e. ethylene pressure and temperature

a Taguchi experimental design was worked out. An L27 orthogonal array was chosen to take the above-mentioned parameters and relevant interactions into account. Response surface method was the tool used to analyze the experimental design results. Al/Ti

ethylene pressure and temperature were selected as experimental design factors

and catalyst activity and polymerization yield were the response parameters. Increasing pressure

due to an increment in monomer accessibility

and rising Al/Ti

because of higher reduction in the catalysts

cause an increase in both polymerization yield and catalyst activity. Nonetheless

a higher temperature

thanks to reducing ethylene solubility in the slurry medium and partially catalyst destruction

lead to a reduction in both response parameters. A synergistic effect was also observed between temperature and pressure. All catalyst activities will reduce in the presence of hydrogen. Molecular weight also shows a decline in the presence of hydrogen as a transfer agent. However

the polydispersity index remains approximately intact. Using SEM

various morphologies

owing to different catalyst morphologies

were seen for the polyethylene.