Premium
Effect of crystallization conditions on the morphological structure of ethylene‐1‐butene copolymers obtained by different ziegler‐natta catalyst systems
Author(s) -
Pérez E.,
Benavente R.,
Bello A.,
Pereña J. M.,
Aguilar C.,
Martínez M. C.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760311606
Subject(s) - comonomer , natta , materials science , ethylene , copolymer , crystallization , crystallite , catalysis , butene , ziegler–natta catalyst , chemical engineering , polymer chemistry , morphology (biology) , polymerization , composite material , organic chemistry , chemistry , metallurgy , polymer , engineering , genetics , biology
Four ethylene‐ 1 ‐butene copolymers of about the same comonomer content but obtained with different supported Ziegler‐Natta catalyst systems have been studied. The effects of the catalyst and the crystallization conditions on the morphological structure have been analyzed. These two factors'clearly affect the melting endotherms and the most probable crystallite thickness of the copolymers, although no important differences were found in the crystalline contents. The catalyst system influences the melting pattern due to changes in the chemical composition distribution, i.e., variations in the comonomer content between chains of different molecular weight.