STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE

The copolymerization of styrene with á-methylstyrene has been tested using combined metallocene-MAO initiator systems with and without diphenylzinc. The metallocenes used were biscyclopentadienyltitanium dichloride, Cp2TiCl2, bis(n-butylcyclopentadienyl)titanium dichloride, (n-BuCp)2TiCl2, and the h...

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Autores: RABAGLIATI,FRANCO M, MUÑOZ,HÉCTOR E, MARDONES,GABRIELA V
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2010
País:Chile
Institución:CONICYT Chile
Repositorio:SciELO Chile
OAI Identifier:oai:scielo:S0717-97072010000100026
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100026
Access Level:acceso abierto
Palabra clave:Styrene copolymerization
diphenylzinc
metallocene catalysts
tacticity
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spelling STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE RABAGLIATI,FRANCO M MUÑOZ,HÉCTOR E MARDONES,GABRIELA V Styrene copolymerization diphenylzinc metallocene catalysts tacticity The copolymerization of styrene with á-methylstyrene has been tested using combined metallocene-MAO initiator systems with and without diphenylzinc. The metallocenes used were biscyclopentadienyltitanium dichloride, Cp2TiCl2, bis(n-butylcyclopentadienyl)titanium dichloride, (n-BuCp)2TiCl2, and the half-sandwich metallocene indenyltitanium trichloride, IndTiCl3. The results indicate that both binary metallocene-MAO, and ternary Ph2Zn-metallocene-MAO systems are capable of polymerizing á-methylstyrene to poly(á-methylstyrene) as well of its copolymerization with styrene. These initiator systems also show that despite the 1+ inductive effect of the methyl group, which enhances electrón density at the vinyl double bond of styrene, the steric consequence of vinyl substitution hinders monomer coordination to active species, causing a decrease in conversion of either á-MeS to homopolymer or S/á-MeS to the corresponding copolymer. The nature and structure of the metallocene included in the initiator system are determinant of the initiator system's efficiency. For the metallocenes used the efficiency follows the order IndTiCl3 > Cp2TiCl2 > (n-BuCp)2TiCl2, with the half-sandwich metallocene IndTiCl3 showing greater efficiency than the true metallocenes. Sociedad Chilena de Química http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100026
title STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
spellingShingle STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
RABAGLIATI,FRANCO M
Styrene copolymerization
diphenylzinc
metallocene catalysts
tacticity
title_short STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
title_full STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
title_fullStr STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
title_full_unstemmed STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
title_sort STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
author RABAGLIATI,FRANCO M
author_facet RABAGLIATI,FRANCO M
MUÑOZ,HÉCTOR E
MARDONES,GABRIELA V
author_role author
author2 MUÑOZ,HÉCTOR E
MARDONES,GABRIELA V
author2_role author
author
topic Styrene copolymerization
diphenylzinc
metallocene catalysts
tacticity
topic_facet Styrene copolymerization
diphenylzinc
metallocene catalysts
tacticity
description The copolymerization of styrene with á-methylstyrene has been tested using combined metallocene-MAO initiator systems with and without diphenylzinc. The metallocenes used were biscyclopentadienyltitanium dichloride, Cp2TiCl2, bis(n-butylcyclopentadienyl)titanium dichloride, (n-BuCp)2TiCl2, and the half-sandwich metallocene indenyltitanium trichloride, IndTiCl3. The results indicate that both binary metallocene-MAO, and ternary Ph2Zn-metallocene-MAO systems are capable of polymerizing á-methylstyrene to poly(á-methylstyrene) as well of its copolymerization with styrene. These initiator systems also show that despite the 1+ inductive effect of the methyl group, which enhances electrón density at the vinyl double bond of styrene, the steric consequence of vinyl substitution hinders monomer coordination to active species, causing a decrease in conversion of either á-MeS to homopolymer or S/á-MeS to the corresponding copolymer. The nature and structure of the metallocene included in the initiator system are determinant of the initiator system's efficiency. For the metallocenes used the efficiency follows the order IndTiCl3 > Cp2TiCl2 > (n-BuCp)2TiCl2, with the half-sandwich metallocene IndTiCl3 showing greater efficiency than the true metallocenes.
publishDate 2010
format article
status_str publishedVersion
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100026
eu_rights_str_mv openAccess
publisher Sociedad Chilena de Química
institution CONICYT
collection SciELO Chile
reponame_str SciELO Chile
instname_str CONICYT Chile
_version_ 1878404616779988992
publishDateSort 2010
author_browse MARDONES,GABRIELA V
MUÑOZ,HÉCTOR E
RABAGLIATI,FRANCO M
publisherStr Sociedad Chilena de Química
score 6.9460754

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