Dielectric α- and β-relaxations in uncured styrene butadiene rubber

The development of the dynamic glass transition in styrene-butadiene copolymers has been investigated by dielectric spectroscopy in the frequency range from 10-2 to 106 Hz. Two processes were detected and attributed to the α- and β-relaxations. The α relaxation time has a non-Arrhenius temperature b...

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Autores principales:	Cerveny, Silvina, Schwartz, Gustavo Ariel
Publicado:	2002
Materias:	Arrhenius behavior Dielectric spectroscopy Styrene butadiene rubber Activation energy Chemical relaxation Composition Copolymers Dielectric properties Glass transition Polybutadienes Polystyrenes Spectroscopic analysis Rubber
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00249297_v35_n11_p4337_Cerveny http://hdl.handle.net/20.500.12110/paper_00249297_v35_n11_p4337_Cerveny
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00249297_v35_n11_p4337_Cerveny
record_format	dspace
spelling	paper:paper_00249297_v35_n11_p4337_Cerveny2023-06-08T14:52:33Z Dielectric α- and β-relaxations in uncured styrene butadiene rubber Cerveny, Silvina Schwartz, Gustavo Ariel Arrhenius behavior Dielectric spectroscopy Styrene butadiene rubber Activation energy Chemical relaxation Composition Copolymers Dielectric properties Glass transition Polybutadienes Polystyrenes Spectroscopic analysis Rubber The development of the dynamic glass transition in styrene-butadiene copolymers has been investigated by dielectric spectroscopy in the frequency range from 10-2 to 106 Hz. Two processes were detected and attributed to the α- and β-relaxations. The α relaxation time has a non-Arrhenius temperature behavior that is highly dependent on styrene content while the β relaxation time shows an Arrhenius behavior with an activation energy that is independent of styrene-content. Furthermore, the shape of the α-relaxation is strongly influenced by the styrene content while the shape of β-relaxation is not. We interpret these results as follows. The observed β-relaxation is primarily due to local motions of butadiene monomers and therefore not affected by the presence of styrene. The α-relaxation, on the other hand, is highly sensitive to the styrene content due to its cooperative character. Fil:Cerveny, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Schwartz, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00249297_v35_n11_p4337_Cerveny http://hdl.handle.net/20.500.12110/paper_00249297_v35_n11_p4337_Cerveny
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Arrhenius behavior Dielectric spectroscopy Styrene butadiene rubber Activation energy Chemical relaxation Composition Copolymers Dielectric properties Glass transition Polybutadienes Polystyrenes Spectroscopic analysis Rubber
spellingShingle	Arrhenius behavior Dielectric spectroscopy Styrene butadiene rubber Activation energy Chemical relaxation Composition Copolymers Dielectric properties Glass transition Polybutadienes Polystyrenes Spectroscopic analysis Rubber Cerveny, Silvina Schwartz, Gustavo Ariel Dielectric α- and β-relaxations in uncured styrene butadiene rubber
topic_facet	Arrhenius behavior Dielectric spectroscopy Styrene butadiene rubber Activation energy Chemical relaxation Composition Copolymers Dielectric properties Glass transition Polybutadienes Polystyrenes Spectroscopic analysis Rubber
description	The development of the dynamic glass transition in styrene-butadiene copolymers has been investigated by dielectric spectroscopy in the frequency range from 10-2 to 106 Hz. Two processes were detected and attributed to the α- and β-relaxations. The α relaxation time has a non-Arrhenius temperature behavior that is highly dependent on styrene content while the β relaxation time shows an Arrhenius behavior with an activation energy that is independent of styrene-content. Furthermore, the shape of the α-relaxation is strongly influenced by the styrene content while the shape of β-relaxation is not. We interpret these results as follows. The observed β-relaxation is primarily due to local motions of butadiene monomers and therefore not affected by the presence of styrene. The α-relaxation, on the other hand, is highly sensitive to the styrene content due to its cooperative character.
author	Cerveny, Silvina Schwartz, Gustavo Ariel
author_facet	Cerveny, Silvina Schwartz, Gustavo Ariel
author_sort	Cerveny, Silvina
title	Dielectric α- and β-relaxations in uncured styrene butadiene rubber
title_short	Dielectric α- and β-relaxations in uncured styrene butadiene rubber
title_full	Dielectric α- and β-relaxations in uncured styrene butadiene rubber
title_fullStr	Dielectric α- and β-relaxations in uncured styrene butadiene rubber
title_full_unstemmed	Dielectric α- and β-relaxations in uncured styrene butadiene rubber
title_sort	dielectric α- and β-relaxations in uncured styrene butadiene rubber
publishDate	2002
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00249297_v35_n11_p4337_Cerveny http://hdl.handle.net/20.500.12110/paper_00249297_v35_n11_p4337_Cerveny
work_keys_str_mv	AT cervenysilvina dielectricaandbrelaxationsinuncuredstyrenebutadienerubber AT schwartzgustavoariel dielectricaandbrelaxationsinuncuredstyrenebutadienerubber
_version_	1768545315892232192

Dielectric α- and β-relaxations in uncured styrene butadiene rubber

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