Polymerizations of ethylene with dinuclear hexamethyltrisiloxanediylbis-(cyclopentadienylindenylzirconium dichloride)

Dong Ho Lee; Keun Byoung Yoon; Hun Bong Lee; Seok Kyun Noh; Jae Young Shim

Polymerizations of ethylene with dinuclear hexamethyltrisiloxanediylbis-(cyclopentadienylindenylzirconium dichloride)

Dong Ho Lee, Keun Byoung Yoon, Hun Bong Lee, Seok Kyun Noh, Jae Young Shim

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

With a new trisiloxane-bridged dinuclear zirconocene, hexamethyltrisiloxanediylbis (cyclopentadienylindenylzirconium dichloride) (TSDZ) Cl₂IndZr-CpSi(CH₃)₂-O-Si-(CH₃) ₂-O-Si(CH₃)₂ Cp-ZrIndCl₂, the polymerizations of ethylene were carried out in the presence of modified MAO (MMAO) as a cocatalyst. The effects of MMAO amount and polymerization temperature (T_p) on polymerization behaviours of TSDZ were examined and compared with those of mononuclear zirconocenes such as cyclopentadienylindenylzirconium dichloride, biscyclopentadienylzirconium dichloride and bisindenylzirconium dichloride. The catalytic activity of TSDZ was comparable to that of mononuclear zirconocenes, while the weight-average molecular weight (M_k) and polydispersity index (MJM_k) of polyethylene (PE) prepared with the former were much higher than those of PE with the latter. With increasing MMAO concentration, the catalytic activity increased but M_k decreased for TSDZ, as well as mononuclear zirconocenes. With increasing T_r the catalytic activity of TSDZ was a maximum at 40 °C while that of mononuclear zirconocenes increased steadily. For increased T_r the decrease of M_k and MJM_k for TSDZ was extraordinary compared to that for mononuclear zirconocenes.

Original language	English
Pages (from-to)	107-111
Number of pages	5
Journal	Korea Polymer Journal
Volume	4
Issue number	2
State	Published - 1996

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@article{b7309bdfbe0749a2854625afc8dc4845,

title = "Polymerizations of ethylene with dinuclear hexamethyltrisiloxanediylbis-(cyclopentadienylindenylzirconium dichloride)",

abstract = "With a new trisiloxane-bridged dinuclear zirconocene, hexamethyltrisiloxanediylbis (cyclopentadienylindenylzirconium dichloride) (TSDZ) Cl2IndZr-CpSi(CH3)2-O-Si-(CH3) 2-O-Si(CH3)2 Cp-ZrIndCl2, the polymerizations of ethylene were carried out in the presence of modified MAO (MMAO) as a cocatalyst. The effects of MMAO amount and polymerization temperature (Tp) on polymerization behaviours of TSDZ were examined and compared with those of mononuclear zirconocenes such as cyclopentadienylindenylzirconium dichloride, biscyclopentadienylzirconium dichloride and bisindenylzirconium dichloride. The catalytic activity of TSDZ was comparable to that of mononuclear zirconocenes, while the weight-average molecular weight (Mk) and polydispersity index (MJMk) of polyethylene (PE) prepared with the former were much higher than those of PE with the latter. With increasing MMAO concentration, the catalytic activity increased but Mk decreased for TSDZ, as well as mononuclear zirconocenes. With increasing Tr the catalytic activity of TSDZ was a maximum at 40 °C while that of mononuclear zirconocenes increased steadily. For increased Tr the decrease of Mk and MJMk for TSDZ was extraordinary compared to that for mononuclear zirconocenes.",

author = "Lee, {Dong Ho} and Yoon, {Keun Byoung} and Lee, {Hun Bong} and Noh, {Seok Kyun} and Shim, {Jae Young}",

year = "1996",

language = "English",

volume = "4",

pages = "107--111",

journal = "Korea Polymer Journal",

issn = "1225-5947",

publisher = "Polymer Society of Korea",

number = "2",

}

TY - JOUR

T1 - Polymerizations of ethylene with dinuclear hexamethyltrisiloxanediylbis-(cyclopentadienylindenylzirconium dichloride)

AU - Lee, Dong Ho

AU - Yoon, Keun Byoung

AU - Lee, Hun Bong

AU - Noh, Seok Kyun

AU - Shim, Jae Young

PY - 1996

Y1 - 1996

N2 - With a new trisiloxane-bridged dinuclear zirconocene, hexamethyltrisiloxanediylbis (cyclopentadienylindenylzirconium dichloride) (TSDZ) Cl2IndZr-CpSi(CH3)2-O-Si-(CH3) 2-O-Si(CH3)2 Cp-ZrIndCl2, the polymerizations of ethylene were carried out in the presence of modified MAO (MMAO) as a cocatalyst. The effects of MMAO amount and polymerization temperature (Tp) on polymerization behaviours of TSDZ were examined and compared with those of mononuclear zirconocenes such as cyclopentadienylindenylzirconium dichloride, biscyclopentadienylzirconium dichloride and bisindenylzirconium dichloride. The catalytic activity of TSDZ was comparable to that of mononuclear zirconocenes, while the weight-average molecular weight (Mk) and polydispersity index (MJMk) of polyethylene (PE) prepared with the former were much higher than those of PE with the latter. With increasing MMAO concentration, the catalytic activity increased but Mk decreased for TSDZ, as well as mononuclear zirconocenes. With increasing Tr the catalytic activity of TSDZ was a maximum at 40 °C while that of mononuclear zirconocenes increased steadily. For increased Tr the decrease of Mk and MJMk for TSDZ was extraordinary compared to that for mononuclear zirconocenes.

AB - With a new trisiloxane-bridged dinuclear zirconocene, hexamethyltrisiloxanediylbis (cyclopentadienylindenylzirconium dichloride) (TSDZ) Cl2IndZr-CpSi(CH3)2-O-Si-(CH3) 2-O-Si(CH3)2 Cp-ZrIndCl2, the polymerizations of ethylene were carried out in the presence of modified MAO (MMAO) as a cocatalyst. The effects of MMAO amount and polymerization temperature (Tp) on polymerization behaviours of TSDZ were examined and compared with those of mononuclear zirconocenes such as cyclopentadienylindenylzirconium dichloride, biscyclopentadienylzirconium dichloride and bisindenylzirconium dichloride. The catalytic activity of TSDZ was comparable to that of mononuclear zirconocenes, while the weight-average molecular weight (Mk) and polydispersity index (MJMk) of polyethylene (PE) prepared with the former were much higher than those of PE with the latter. With increasing MMAO concentration, the catalytic activity increased but Mk decreased for TSDZ, as well as mononuclear zirconocenes. With increasing Tr the catalytic activity of TSDZ was a maximum at 40 °C while that of mononuclear zirconocenes increased steadily. For increased Tr the decrease of Mk and MJMk for TSDZ was extraordinary compared to that for mononuclear zirconocenes.

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M3 - Article

AN - SCOPUS:0345997619

SN - 1225-5947

VL - 4

SP - 107

EP - 111

JO - Korea Polymer Journal

JF - Korea Polymer Journal

IS - 2

ER -

Polymerizations of ethylene with dinuclear hexamethyltrisiloxanediylbis-(cyclopentadienylindenylzirconium dichloride)

Abstract

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