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Propene polymerization with Mg(OEt)2-supported TiCl4 catalyst—4. Effects of hydrogen

✍ Scribed by Dong-ho Lee; Young-tae Jeong

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
335 KB
Volume
29
Category
Article
ISSN
0014-3057

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✦ Synopsis

With Mg(OEt)2/benzoyl chloride/TiC14 catalyst prepared by the chemical reaction method, propene polymerizations have been carried out with triethylaluminium (TEA) cocatalyst including external donor (ED); the effect of hydrogen on the polymerization was studied. In the presence of hydrogen, the activity enhancement depended on the kind and amount of ED. The isotactic index of polypropene was affected by ED and hydrogen. The molecular weight distributions shifted to high molecular weight, forming bimodal distributions, with increasing amount of ED but the bimodal phenomenon was minimized by addition of hydrogen. It is proposed that the active sites of different isospecificities have different sensitivities to hydrogen transfer and that the more isospecific active sites are more sensitive to hydrogen.

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