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The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives
In the present study, copolymerization of ethylene and 1-hexene was conducted with a series of ansa-fluorenylamidodimethyltitanium complexes, including [t-BuNSiMe(2)Flu]TiMe(2) (complex 1), [cyclododecylNSiMe(2)Flu]TiMe(2) (complex 2) and [t-BuNSiMe(2)(2,7-t-Bu(2)Flu)]TiMe(2) (complex 3), activated...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6263282/ http://dx.doi.org/10.3390/molecules16054122 |
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author | Kaivalchatchawal, Patcharaporn Praserthdam, Piyasan Sogo, Yuuichi Cai, Zhengguo Shiono, Takeshi Jongsomjit, Bunjerd |
author_facet | Kaivalchatchawal, Patcharaporn Praserthdam, Piyasan Sogo, Yuuichi Cai, Zhengguo Shiono, Takeshi Jongsomjit, Bunjerd |
author_sort | Kaivalchatchawal, Patcharaporn |
collection | PubMed |
description | In the present study, copolymerization of ethylene and 1-hexene was conducted with a series of ansa-fluorenylamidodimethyltitanium complexes, including [t-BuNSiMe(2)Flu]TiMe(2) (complex 1), [cyclododecylNSiMe(2)Flu]TiMe(2) (complex 2) and [t-BuNSiMe(2)(2,7-t-Bu(2)Flu)]TiMe(2) (complex 3), activated by MMAO. The effect of these catalysts on catalytic behavior, namely activity, molecular weight and monomer reactivity ratios, has been investigated. The results showed that all of them acted by a single site polymerization mechanism and the molecular weight distribution is independent of catalyst structure. Based on the study, it revealed that the introduction of a t-butyl at the 2,7 position on the fluorenyl ligand is able to enhance both catalytic activity and copolymer molecular weight more than introducing a cyclododecyl on the amine, which is probably associated with the electronic effect exerted by the t-butyl substituent. The comonomer incorporation content was controllable over a wide range by adjusting the comonomer feed ratio. Moreover, referring to monomer reactivity ratio exploration, it seems that the substitution on the ansa-fluorenylamidodimethyltitanium complex tends to hinder the insertion of 1-hexene into the polymer chain, leading to the highest 1-hexene content for traditional complex 1. |
format | Online Article Text |
id | pubmed-6263282 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-62632822018-12-10 The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives Kaivalchatchawal, Patcharaporn Praserthdam, Piyasan Sogo, Yuuichi Cai, Zhengguo Shiono, Takeshi Jongsomjit, Bunjerd Molecules Article In the present study, copolymerization of ethylene and 1-hexene was conducted with a series of ansa-fluorenylamidodimethyltitanium complexes, including [t-BuNSiMe(2)Flu]TiMe(2) (complex 1), [cyclododecylNSiMe(2)Flu]TiMe(2) (complex 2) and [t-BuNSiMe(2)(2,7-t-Bu(2)Flu)]TiMe(2) (complex 3), activated by MMAO. The effect of these catalysts on catalytic behavior, namely activity, molecular weight and monomer reactivity ratios, has been investigated. The results showed that all of them acted by a single site polymerization mechanism and the molecular weight distribution is independent of catalyst structure. Based on the study, it revealed that the introduction of a t-butyl at the 2,7 position on the fluorenyl ligand is able to enhance both catalytic activity and copolymer molecular weight more than introducing a cyclododecyl on the amine, which is probably associated with the electronic effect exerted by the t-butyl substituent. The comonomer incorporation content was controllable over a wide range by adjusting the comonomer feed ratio. Moreover, referring to monomer reactivity ratio exploration, it seems that the substitution on the ansa-fluorenylamidodimethyltitanium complex tends to hinder the insertion of 1-hexene into the polymer chain, leading to the highest 1-hexene content for traditional complex 1. MDPI 2011-05-19 /pmc/articles/PMC6263282/ http://dx.doi.org/10.3390/molecules16054122 Text en © 2011 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Article Kaivalchatchawal, Patcharaporn Praserthdam, Piyasan Sogo, Yuuichi Cai, Zhengguo Shiono, Takeshi Jongsomjit, Bunjerd The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives |
title | The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives |
title_full | The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives |
title_fullStr | The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives |
title_full_unstemmed | The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives |
title_short | The Influence of t-Butyl and Cyclododecyl Substitution on Ethylene/1-Hexene Copolymerization Using Ansa-Fluorenylamidodimethyltitanium Derivatives |
title_sort | influence of t-butyl and cyclododecyl substitution on ethylene/1-hexene copolymerization using ansa-fluorenylamidodimethyltitanium derivatives |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6263282/ http://dx.doi.org/10.3390/molecules16054122 |
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