The role of allylanisole in metallocene-catalyzed propylene polymerization and synthesis of end-capped oligomers

Muhammad Atiqullah; Muhammad N. Akhtar; Michael Tinkl; Neaz Ahmed

doi:10.1002/mren.200700053

The role of allylanisole in metallocene-catalyzed propylene polymerization and synthesis of end-capped oligomers

Muhammad Atiqullah^*
, Muhammad N. Akhtar
, Michael Tinkl
, Neaz Ahmed

^*Corresponding author for this work

Interdisciplinary Research Center for Refining and Advanced Chemicals

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

2 Scopus citations

Abstract

Propylene was copolymerized with allylanisole (AA) using Me ₂Si(Ind)₂ZrCl₂ and Et(Ind)₂ZrCl ₂, and the methylaluminoxane MAO cocatalyst at 70 °C and a cocatalyst to catalyst (Al:Zr) molar ratio of 1000. It was fed at 8.5 bar(g). The weight-average molecular weight, M̄_w, for both metallocenes decreased as the AA teed concentration increased. Therefore, allylanisole acted as an in situ chain transfer agent. The chain transfer constants, k _tr/k_p, of AA for Et(Ind)₂ZrCl₂ and Me₂Si(Ind)₂ZrCl₂ turned out to be 0.33 and 0.40, respectively. The characterization of the resulting products by ¹HNMR demonstrated that AA end-capped the isotactic poly(propylene) chains which showed to be low molecular weight oligomers; 4.96 × 10 ³ ≤ M̄_w ≤ 9.80 × 10³. An appropriate chain transfer mechanism for AA has been proposed.

Original language	English
Pages (from-to)	334-338
Number of pages	5
Journal	Macromolecular Reaction Engineering
Volume	2
Issue number	4
DOIs	https://doi.org/10.1002/mren.200700053
State	Published - 28 Jul 2008

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Polymers and Plastics

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@article{e72734a3859b40c18f2959d144503efd,

title = "The role of allylanisole in metallocene-catalyzed propylene polymerization and synthesis of end-capped oligomers",

abstract = "Propylene was copolymerized with allylanisole (AA) using Me 2Si(Ind)2ZrCl2 and Et(Ind)2ZrCl 2, and the methylaluminoxane MAO cocatalyst at 70 °C and a cocatalyst to catalyst (Al:Zr) molar ratio of 1000. It was fed at 8.5 bar(g). The weight-average molecular weight, {\=M}w, for both metallocenes decreased as the AA teed concentration increased. Therefore, allylanisole acted as an in situ chain transfer agent. The chain transfer constants, k tr/kp, of AA for Et(Ind)2ZrCl2 and Me2Si(Ind)2ZrCl2 turned out to be 0.33 and 0.40, respectively. The characterization of the resulting products by 1HNMR demonstrated that AA end-capped the isotactic poly(propylene) chains which showed to be low molecular weight oligomers; 4.96 × 10 3 ≤ {\=M}w ≤ 9.80 × 103. An appropriate chain transfer mechanism for AA has been proposed.",

author = "Muhammad Atiqullah and Akhtar, \{Muhammad N.\} and Michael Tinkl and Neaz Ahmed",

year = "2008",

month = jul,

day = "28",

doi = "10.1002/mren.200700053",

language = "English",

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pages = "334--338",

journal = "Macromolecular Reaction Engineering",

issn = "1862-832X",

publisher = "Wiley-VCH Verlag",

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TY - JOUR

T1 - The role of allylanisole in metallocene-catalyzed propylene polymerization and synthesis of end-capped oligomers

AU - Atiqullah, Muhammad

AU - Akhtar, Muhammad N.

AU - Tinkl, Michael

AU - Ahmed, Neaz

PY - 2008/7/28

Y1 - 2008/7/28

N2 - Propylene was copolymerized with allylanisole (AA) using Me 2Si(Ind)2ZrCl2 and Et(Ind)2ZrCl 2, and the methylaluminoxane MAO cocatalyst at 70 °C and a cocatalyst to catalyst (Al:Zr) molar ratio of 1000. It was fed at 8.5 bar(g). The weight-average molecular weight, M̄w, for both metallocenes decreased as the AA teed concentration increased. Therefore, allylanisole acted as an in situ chain transfer agent. The chain transfer constants, k tr/kp, of AA for Et(Ind)2ZrCl2 and Me2Si(Ind)2ZrCl2 turned out to be 0.33 and 0.40, respectively. The characterization of the resulting products by 1HNMR demonstrated that AA end-capped the isotactic poly(propylene) chains which showed to be low molecular weight oligomers; 4.96 × 10 3 ≤ M̄w ≤ 9.80 × 103. An appropriate chain transfer mechanism for AA has been proposed.

AB - Propylene was copolymerized with allylanisole (AA) using Me 2Si(Ind)2ZrCl2 and Et(Ind)2ZrCl 2, and the methylaluminoxane MAO cocatalyst at 70 °C and a cocatalyst to catalyst (Al:Zr) molar ratio of 1000. It was fed at 8.5 bar(g). The weight-average molecular weight, M̄w, for both metallocenes decreased as the AA teed concentration increased. Therefore, allylanisole acted as an in situ chain transfer agent. The chain transfer constants, k tr/kp, of AA for Et(Ind)2ZrCl2 and Me2Si(Ind)2ZrCl2 turned out to be 0.33 and 0.40, respectively. The characterization of the resulting products by 1HNMR demonstrated that AA end-capped the isotactic poly(propylene) chains which showed to be low molecular weight oligomers; 4.96 × 10 3 ≤ M̄w ≤ 9.80 × 103. An appropriate chain transfer mechanism for AA has been proposed.

UR - https://www.scopus.com/pages/publications/55349084764

U2 - 10.1002/mren.200700053

DO - 10.1002/mren.200700053

M3 - Article

AN - SCOPUS:55349084764

SN - 1862-832X

VL - 2

SP - 334

EP - 338

JO - Macromolecular Reaction Engineering

JF - Macromolecular Reaction Engineering

IS - 4

ER -

The role of allylanisole in metallocene-catalyzed propylene polymerization and synthesis of end-capped oligomers

Abstract

ASJC Scopus subject areas

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