Control of bulk density and particle size distribution of polyethylene
Polimery 1994, No 10, 597
One of most important properties of polyolefins obtained on Ziegler-Natta type catalysts is the size of polymer grains. From a technological point of view it is desirable to obtain a polymer of the highest bulk density. In this Institute we have studied the bulk density and particle size distribution of olyethylene (PE) obtained on a new titanium-magnesium catalyst. Bulk density and particle size distribution of PE were studied as functions of the supported catalyst composition as well as polymerization time. Results were compared with those obtained on conventional catalysts. It was found that the modification of titanium-magnesium catalysts and the time of polymerization improve the bulk density of resulting PE. The particle size distribution of PE obtained on a titanium-magnesium catalyst differs from that obtained on a conventional catalytic system. The distribution of a conventional PE is very broad in contrast to PE obtained on our catalyst which has a distinct narrow maximum. As the time of polymerization is increased, the particle size distribution of PE shifts toward small diameters.
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