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Effect of polymerization temperature on the microtacticity of isotactic poly(propylene) prepared using heterogeneous (MgCl 2 ‐supported) Ziegler‐Natta catalysts
Author(s) -
Chadwick John C.,
Morini Giampiero,
Balbontin Giulio,
Sudmeijer Olof
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980901)199:9<1873::aid-macp1873>3.0.co;2-c
Subject(s) - tacticity , natta , ziegler–natta catalyst , polymerization , polymer chemistry , polymer , catalysis , materials science , chemistry , organic chemistry , composite material
Abstract A study of the effect of polymerization temperature on the microtacticity of poly(propylene) prepared using various MgCl 2 ‐supported catalysts has shown that, in almost all cases, an increase in temperature leads not only to higher proportions of isotactic polymer but also to increased stereoregularity of the isotactic fraction. The results indicate a greater relative increase in productivity, with increasing temperature, for highly isospecific as opposed to moderately isospecific centres. It is suggested that easier propagation after the occasional regioirregular (2,1‐) insertion may contribute to this effect.