Res. Chem. Intermed.
, Vol. 34, Nos 8–9, pp. 687–691 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Microstructure analysis of ethylene/1-hexene co-polymers
with embedded rac-Et[Ind]
DONG MIN SHIN
, VIET HUNG PHAM
, KYOUNG WON LA
IN KYU SONG
and JIN SUK CHUNG
School of Chemical Engineering and Bioengineering, University of Ulsan, Ulsan 680-749, Korea
School of Chemical and Biological Engineering, Institute of Chemical Processes,
Seoul National University, Shinlim-dong, Kwanak-ku, Seoul 151-744, Korea
Received 11 July 2007; accepted 29 August 2007
Abstract—Co-polymerization of ethylene and 1-hexene using rac-Et[Ind]
embedded in polystyrene in liquid slurry process was examined. The embedded catalyst was prepared
by polymerizing a small amount of styrene. The speciﬁc activities and bulk densities of the co-
polymers produced by the embedded catalyst were higher than those of the homogeneous catalyst.
The produced co-polymer with embedded catalyst had more random distribution of 1-hexene at the
similar co-monomer content than that with homogeneous catalyst.
Keywords: Co-polymerization; rac-Et[Ind]
/MAO; metallocene catalyst.
Metallocene catalysts have received considerable attention because they exhibit
lots of the promising advantages over the conventional Ziegler–Natta catalysts for
ethylene co-polymerization with α-oleﬁn . However, in order to use metallocene
catalysts in current processes, it is desirable to heterogenize them such that they can
be employed as “drop-in” catalyst in the process.
Many methods of the heterogenization of homogeneous metallocene catalysts
have been investigated by researchers. As a result of their efforts, the homogeneous
metallocene catalysts can be modiﬁed to be applied for a heterogeneous system in
various ways. One popular method is to impregnate the metallocene catalyst onto
an inorganic support [2–4].
In this work, we tried to heterogenize a homogeneous metallocene catalyst by
using very small amounts of styrene. The prepared catalyst was applied to ethylene–
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