Premium
Stereoregularity and regioregularity of active centers in propene polymerization
Author(s) -
Kashiwa Norio,
Kojoh ShinIchi
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950890106
Subject(s) - propene , catalysis , phthalate , chemistry , active site , polymer chemistry , ethyl benzoate , polymerization , stereochemistry , organic chemistry , polymer
The relation between stereoregularity of active centers on a MgCl 2 /TiCl 4 catalyst and functions of inside donor (ID) and outside donor (OD) was investigated in the case of ethyl benzoate (EB)/methyl p‐toluate (MPT) as an ID/OD pair. The results indicate that stereregularity depends merely on the amount of MPT supported on the catalyst. On the other hand, regioregularity of active centers was investigated with a MgCl 2 /TiCl 4 /dioctyl phthalate(DOP)‐Et 3 Al/diphenyldimethoxysilane(DPDMS) catalyst system. Regio‐irregular inserted units were detected only in end groups of PP. It indicates that regio‐irregular insertion leads to dormant centers with respect to propene insertion, though such centers are active for hydrogen transfer.