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Copolymerization of propene and higher α‐olefins with the metallocene catalyst Et[Ind] 2 HfCl 2 /methylaluminoxane
Author(s) -
Arnold Manfred,
Henschke Olaf,
Knorr Jana
Publication year - 1996
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/macp.1996.021970212
Subject(s) - comonomer , methylaluminoxane , metallocene , propene , copolymer , polymer chemistry , post metallocene catalyst , olefin fiber , 1 hexene , ethylene , polyolefin , chemistry , catalysis , ziegler–natta catalyst , materials science , organic chemistry , polymerization , polymer , layer (electronics)
Copolymerizations of propene with higher α‐olefins including 1‐butene, 1‐hexene, 1‐octene, 1‐dodecene and 1‐hexadecene were carried out with an isospecific metallocene catalyst (Et[Ind] 2 HfCl 2 /methylaluminoxane) at 30°C in toluene. 13 C NMR analysis showed that all products obtained are random copolymers ( r 1 · r 2 ∼ 1). The reactivity of the higher α‐olefins in the copolymerization is surprisingly high and decreases only slightly with increasing length of the olefin. The incorporation rates of the comonomers in this study were found to be much higher than those obtained by the use of heterogeneous Ziegler‐Natta catalysts. Hence, copolymers with every desired composition and α‐olefin homopolymers can be prepared. The molecular weight of the copolymers is reduced with rising comonomer content. Melting points and glass transition temperatures studied by means of differential scanning calorimetry show a decrease with rising comonomer content and increasing length of the α‐olefin.