Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test

Mostrar todas las versiones(3)

An experimental investigation was performed to study the effect on the free volume of the advance of the cross-linking reaction in a copolymer of styrene butadiene rubber by sulfur vulcanization. The dynamic modulus and loss tangent were evaluated over samples cured for different times at 433 K by d...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Marzocca, A.J., Cerveny, S., Salgueiro, W., Somoza, A., Gonzalez, L.
Formato: JOUR
Materias:
Copolymers
Correlation methods
Mathematical models
Parameter estimation
Positron annihilation spectroscopy
Spectrum analysis
Sulfur
Van der Waals forces
Vulcanization
Dynamic mechanical tests
Free volumes
Styrene butadiene rubbers (SBR)
Sulfur vulcanization
William-Landel-Ferry relationships
Rubber
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1063651X_v65_n2_p_Marzocca
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_1063651X_v65_n2_p_Marzocca
record_format dspace
spelling todo:paper_1063651X_v65_n2_p_Marzocca2023-10-03T16:01:37Z Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test Marzocca, A.J. Cerveny, S. Salgueiro, W. Somoza, A. Gonzalez, L. Copolymers Correlation methods Mathematical models Parameter estimation Positron annihilation spectroscopy Spectrum analysis Sulfur Van der Waals forces Vulcanization Dynamic mechanical tests Free volumes Styrene butadiene rubbers (SBR) Sulfur vulcanization William-Landel-Ferry relationships Rubber An experimental investigation was performed to study the effect on the free volume of the advance of the cross-linking reaction in a copolymer of styrene butadiene rubber by sulfur vulcanization. The dynamic modulus and loss tangent were evaluated over samples cured for different times at 433 K by dynamic mechanical tests over a range of frequencies between 5 and 80 Hz at temperatures between 200 and 300 K. Using the William-Landel-Ferry relationship, master curves were obtained at a reference temperature of 298 K and the coefficients [formula presented] and [formula presented] were evaluated. From these parameters the dependence of the free volume on the cure time is obtained. Positron annihilation lifetime spectroscopy was also used to estimate the size and number density of free volume sites in the material. The spectra were analyzed in terms of continuous distributions of free volume size. The results suggest an increase of the lower free volume size when cross linking takes place. Both techniques give similar results for the dependence of free volume on the time of cure of the polymer. © 2002 The American Physical Society. Fil:Marzocca, A.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerveny, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1063651X_v65_n2_p_Marzocca
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Copolymers
Correlation methods
Mathematical models
Parameter estimation
Positron annihilation spectroscopy
Spectrum analysis
Sulfur
Van der Waals forces
Vulcanization
Dynamic mechanical tests
Free volumes
Styrene butadiene rubbers (SBR)
Sulfur vulcanization
William-Landel-Ferry relationships
Rubber
spellingShingle Copolymers
Correlation methods
Mathematical models
Parameter estimation
Positron annihilation spectroscopy
Spectrum analysis
Sulfur
Van der Waals forces
Vulcanization
Dynamic mechanical tests
Free volumes
Styrene butadiene rubbers (SBR)
Sulfur vulcanization
William-Landel-Ferry relationships
Rubber
Marzocca, A.J.
Cerveny, S.
Salgueiro, W.
Somoza, A.
Gonzalez, L.
Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
topic_facet Copolymers
Correlation methods
Mathematical models
Parameter estimation
Positron annihilation spectroscopy
Spectrum analysis
Sulfur
Van der Waals forces
Vulcanization
Dynamic mechanical tests
Free volumes
Styrene butadiene rubbers (SBR)
Sulfur vulcanization
William-Landel-Ferry relationships
Rubber
description An experimental investigation was performed to study the effect on the free volume of the advance of the cross-linking reaction in a copolymer of styrene butadiene rubber by sulfur vulcanization. The dynamic modulus and loss tangent were evaluated over samples cured for different times at 433 K by dynamic mechanical tests over a range of frequencies between 5 and 80 Hz at temperatures between 200 and 300 K. Using the William-Landel-Ferry relationship, master curves were obtained at a reference temperature of 298 K and the coefficients [formula presented] and [formula presented] were evaluated. From these parameters the dependence of the free volume on the cure time is obtained. Positron annihilation lifetime spectroscopy was also used to estimate the size and number density of free volume sites in the material. The spectra were analyzed in terms of continuous distributions of free volume size. The results suggest an increase of the lower free volume size when cross linking takes place. Both techniques give similar results for the dependence of free volume on the time of cure of the polymer. © 2002 The American Physical Society.
format JOUR
author Marzocca, A.J.
Cerveny, S.
Salgueiro, W.
Somoza, A.
Gonzalez, L.
author_facet Marzocca, A.J.
Cerveny, S.
Salgueiro, W.
Somoza, A.
Gonzalez, L.
author_sort Marzocca, A.J.
title Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
title_short Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
title_full Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
title_fullStr Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
title_full_unstemmed Characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
title_sort characterization of free volume during vulcanization of styrene butadiene rubber by means of positron annihilation lifetime spectroscopy and dynamic mechanical test
url http://hdl.handle.net/20.500.12110/paper_1063651X_v65_n2_p_Marzocca
work_keys_str_mv AT marzoccaaj characterizationoffreevolumeduringvulcanizationofstyrenebutadienerubberbymeansofpositronannihilationlifetimespectroscopyanddynamicmechanicaltest
AT cervenys characterizationoffreevolumeduringvulcanizationofstyrenebutadienerubberbymeansofpositronannihilationlifetimespectroscopyanddynamicmechanicaltest
AT salgueirow characterizationoffreevolumeduringvulcanizationofstyrenebutadienerubberbymeansofpositronannihilationlifetimespectroscopyanddynamicmechanicaltest
AT somozaa characterizationoffreevolumeduringvulcanizationofstyrenebutadienerubberbymeansofpositronannihilationlifetimespectroscopyanddynamicmechanicaltest
AT gonzalezl characterizationoffreevolumeduringvulcanizationofstyrenebutadienerubberbymeansofpositronannihilationlifetimespectroscopyanddynamicmechanicaltest
_version_ 1782028674179006464

Ejemplares similares