Kinetic and microstructure studies of poly(ethylene-co-p-methylstyrene) copolymers prepared by metallocene catalysts with constrained ligand geometry

Synthesis and functionalization of ethylene/p-allyltoluene copolymer

“…2 shows the plot of a 2 /b vs. a À a/b and the least-squares best-fit line. The results are: r E = 37.626 ± 0.076, r C = 0.050 ± 0.003, r E · r C = 1.88 and the correlation coefficient R = 0.999. r C of p-AT is higher than that of p-MS ($0) [12] under the similar polymerization conditions. The value of r E · r C is close to one, which indicates that the near ideal random copolymerization reaction and very small probability of two p-AT units adjacent to each other in the polymer chain.…”

“…However, the reactivity ratio of p-MS copolymerized with ethylene is usually low possibly due to the combination of the steric hindrance of bulk benzyl and 2,1-insertion mechanism of p-MS to catalyst site [12]. Generally, ethylene is polymerized with a-olefin, for example allyl derivates, involving less steric hindrance by the 1,2-insertion mechanism with higher incorporation of commoner [13,14].…”

A Comparative Study on the Homo-, Co- and Ter-Polymerization Using Ethylene, 1-Decene and p-Methylstyrene

“…However, studies on the polyolefins with reactive groups have been limited, even though it may be possible to use the terpolymers to develop new high-functional polyolefins [2][3][4][5]. T. C. Chung et al reported on the terpolymerization of ethylene, 1-octene and p-methylstyrene (p-MS) using [C 5 Me 4 (SiMe 2 NtBu)]TiCl 2 metallocene catalyst [6,7].…”

A Study on the Coordination Polymerization Using C2-Symmetric Dichloro[rac-ethylenebisindenyl] zirconium(IV)/Methylaluminoxane System

“…10,11 In particular, studies on the terpolymers with reactive groups has been limited even though it maybe possible to use the terpolymers to develop new high-functional polyolefins. [12][13][14][15] In this study, we prepared a polyethylene (PE), poly(ethylene-co-1-decene) (PED), and poly(ethylene-co-p-methylstyrene) (PEM), and poly(ethylene-ter-1-decene-ter-p-methylstyrene) (PEDM) using a bridged metallocene catalyst and a cocatalyst system. To optimize the coordination terpolymerization conditions, we studied the effects of the catalyst contents, cocatalyst/catalyst molar ratio, and the polymerization temperature on the catalytic activity, molecular weight, and molecular weight distribution of the terpolymer.…”