STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST

Polyethylenes, homo and copolymers obtained via metallocene catalyst, were synthesized and used to study the effect of comonomer size and content in the main linear backbone polymer on its degradation. Homoethylene metallocene polymer, ethylene-1-hexene and ethylene-1-octadecene metallocene copolyme...

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Autores principales:	ESCUDERO ACEVEDO,MARIO, QUIJADA,RAÚL, CAMPOS VALLETTE,MARCELO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2008
Materias:	Thermal oxidation Degradation Metallocene Polyethylene 1-olefine Copolymers
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000200009
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spelling	oai:scielo:S0717-970720080002000092009-06-09STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYSTESCUDERO ACEVEDO,MARIOQUIJADA,RAÚLCAMPOS VALLETTE,MARCELO Thermal oxidation Degradation Metallocene Polyethylene 1-olefine Copolymers Polyethylenes, homo and copolymers obtained via metallocene catalyst, were synthesized and used to study the effect of comonomer size and content in the main linear backbone polymer on its degradation. Homoethylene metallocene polymer, ethylene-1-hexene and ethylene-1-octadecene metallocene copolymer films were characterized and analyzed during their aging in a forced draft oven at 60 °C for one year. The polymers were characterized before and after ageing using GPC, DSC, FTIR, and tensile tests in order to detect changes in chemical structure, size, and molecular weight distribution as well as to quantify the effect of time over their useful life. As a qualitative reference parameter, the carbonyl index, the ratio of the infrared absorbance of the CO stretching band at 1715 cm-1 and the absorbance of a reference band at 718 cm-1 , was determined. Results showed that kinetic thermooxidation is related to comonomer size and content in the main backbone polymer. As comonomer size decreases or comonomer content increases, degradation rate increases. This can be observed through the scission factor (S) and carbonyl index (CI) graphs of each material which show a slope increasing related to the autocatalytic rate of oxidation.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.53 n.2 20082008-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000200009en10.4067/S0717-97072008000200009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Thermal oxidation Degradation Metallocene Polyethylene 1-olefine Copolymers
spellingShingle	Thermal oxidation Degradation Metallocene Polyethylene 1-olefine Copolymers ESCUDERO ACEVEDO,MARIO QUIJADA,RAÚL CAMPOS VALLETTE,MARCELO STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST
description	Polyethylenes, homo and copolymers obtained via metallocene catalyst, were synthesized and used to study the effect of comonomer size and content in the main linear backbone polymer on its degradation. Homoethylene metallocene polymer, ethylene-1-hexene and ethylene-1-octadecene metallocene copolymer films were characterized and analyzed during their aging in a forced draft oven at 60 °C for one year. The polymers were characterized before and after ageing using GPC, DSC, FTIR, and tensile tests in order to detect changes in chemical structure, size, and molecular weight distribution as well as to quantify the effect of time over their useful life. As a qualitative reference parameter, the carbonyl index, the ratio of the infrared absorbance of the CO stretching band at 1715 cm-1 and the absorbance of a reference band at 718 cm-1 , was determined. Results showed that kinetic thermooxidation is related to comonomer size and content in the main backbone polymer. As comonomer size decreases or comonomer content increases, degradation rate increases. This can be observed through the scission factor (S) and carbonyl index (CI) graphs of each material which show a slope increasing related to the autocatalytic rate of oxidation.
author	ESCUDERO ACEVEDO,MARIO QUIJADA,RAÚL CAMPOS VALLETTE,MARCELO
author_facet	ESCUDERO ACEVEDO,MARIO QUIJADA,RAÚL CAMPOS VALLETTE,MARCELO
author_sort	ESCUDERO ACEVEDO,MARIO
title	STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST
title_short	STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST
title_full	STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST
title_fullStr	STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST
title_full_unstemmed	STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST
title_sort	study of the effect of branching in degradation of polyethylenes obtained via metallocene catalyst
publisher	Sociedad Chilena de Química
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000200009
work_keys_str_mv	AT escuderoacevedomario studyoftheeffectofbranchingindegradationofpolyethylenesobtainedviametallocenecatalyst AT quijadaraul studyoftheeffectofbranchingindegradationofpolyethylenesobtainedviametallocenecatalyst AT camposvallettemarcelo studyoftheeffectofbranchingindegradationofpolyethylenesobtainedviametallocenecatalyst
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STUDY OF THE EFFECT OF BRANCHING IN DEGRADATION OF POLYETHYLENES OBTAINED VIA METALLOCENE CATALYST

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