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 principales:	RABAGLIATI,FRANCO M, MUÑOZ,HÉCTOR E, MARDONES,GABRIELA V
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2010
Materias:	Styrene copolymerization diphenylzinc metallocene catalysts tacticity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100026
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spelling	oai:scielo:S0717-970720100001000262010-04-29STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENERABAGLIATI,FRANCO MMUÑOZ,HÉCTOR EMARDONES,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.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.55 n.1 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100026en10.4067/S0717-97072010000100026
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Styrene copolymerization diphenylzinc metallocene catalysts tacticity
spellingShingle	Styrene copolymerization diphenylzinc metallocene catalysts tacticity RABAGLIATI,FRANCO M MUÑOZ,HÉCTOR E MARDONES,GABRIELA V STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
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.
author	RABAGLIATI,FRANCO M MUÑOZ,HÉCTOR E MARDONES,GABRIELA V
author_facet	RABAGLIATI,FRANCO M MUÑOZ,HÉCTOR E MARDONES,GABRIELA V
author_sort	RABAGLIATI,FRANCO M
title	STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE
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
publisher	Sociedad Chilena de Química
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100026
work_keys_str_mv	AT rabagliatifrancom styrenestyrenederivativecopolymerizationbyph2znmetallocenemaosystemshomoandcopolymerizationofamethylstyrenewithstyrene AT munozhectore styrenestyrenederivativecopolymerizationbyph2znmetallocenemaosystemshomoandcopolymerizationofamethylstyrenewithstyrene AT mardonesgabrielav styrenestyrenederivativecopolymerizationbyph2znmetallocenemaosystemshomoandcopolymerizationofamethylstyrenewithstyrene
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STYRENE/STYRENE-DERIVATIVE COPOLYMERIZATION BY PH2Zn-METALLOCENE-MAO SYSTEMS: HOMO- AND COPOLYMERIZATION OF á-METHYLSTYRENE WITH STYRENE

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