Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)

The reclaiming process of ethylene-propylene-diene monomer (EPDM) using a twin-screw extruder was studied and the effect of reclaiming conditions including screw speed (40, 80 and 120 rpm) and reclaiming agent content (0, 1.5 and 3 phr) at 280 °C (barrel temperature) on swelling, curing, mechanical...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Atefeh Salimi, Foroud Abbassi-Sourki, Mohammad Karrabi, Mir Hamid Reza Ghoreishy
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Thermo-mechanical reclaiming EPDM rubber Curing behavior Stress relaxation Generalized Maxwell model (GMM) Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/b1b3e227948744fc9e57200fcdd4fc32
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:b1b3e227948744fc9e57200fcdd4fc32
record_format	dspace
spelling	oai:doaj.org-article:b1b3e227948744fc9e57200fcdd4fc322021-11-24T04:25:47ZInvestigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)0142-941810.1016/j.polymertesting.2020.106989https://doaj.org/article/b1b3e227948744fc9e57200fcdd4fc322021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0142941820322182https://doaj.org/toc/0142-9418The reclaiming process of ethylene-propylene-diene monomer (EPDM) using a twin-screw extruder was studied and the effect of reclaiming conditions including screw speed (40, 80 and 120 rpm) and reclaiming agent content (0, 1.5 and 3 phr) at 280 °C (barrel temperature) on swelling, curing, mechanical properties as well as stress relaxation of virgin EPDM/40 phr reclaimed rubber blends was evaluated. According to the results of swelling test, the reclaiming process led to both crosslinks breakage and main chain scission. The appropriate reclaiming conditions were determined as the highest screw speed (120 rpm) and reclaiming agent content (3 phr). Compared to virgin EPDM vulcanizates, the curing behavior of prepared blends showed that the addition of reclaimed rubber had no effect on the scorch time but increased the optimum cure time and decreased the cure rate index. The results obtained for mechanical properties demonstrated that the tensile strength, modulus at 100% and 200% elongation and hardness decreased while the elongation at break of the blends showed no particular trend. The analysis of stress relaxation behavior using the Generalized Maxwell Model (GMM) revealed that the initial and final moduli of all blends decreased, and surprisingly the relaxation times were shorter or showed no change compared to the reference sample. Further, the Dynamic Mechanical Thermal Analysis (DMTA) results exhibited that the Tg of blends decreased but the maximum loss tangent presents no change following the addition of 40 phr reclaimed rubber to the virgin EPDM. Finally, the frequency sweep test indicated that the storage modulus of all blends was lower than that of the virgin sample.Atefeh SalimiForoud Abbassi-SourkiMohammad KarrabiMir Hamid Reza GhoreishyElsevierarticleThermo-mechanical reclaimingEPDM rubberCuring behaviorStress relaxationGeneralized Maxwell model (GMM)Polymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 93, Iss , Pp 106989- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermo-mechanical reclaiming EPDM rubber Curing behavior Stress relaxation Generalized Maxwell model (GMM) Polymers and polymer manufacture TP1080-1185
spellingShingle	Thermo-mechanical reclaiming EPDM rubber Curing behavior Stress relaxation Generalized Maxwell model (GMM) Polymers and polymer manufacture TP1080-1185 Atefeh Salimi Foroud Abbassi-Sourki Mohammad Karrabi Mir Hamid Reza Ghoreishy Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)
description	The reclaiming process of ethylene-propylene-diene monomer (EPDM) using a twin-screw extruder was studied and the effect of reclaiming conditions including screw speed (40, 80 and 120 rpm) and reclaiming agent content (0, 1.5 and 3 phr) at 280 °C (barrel temperature) on swelling, curing, mechanical properties as well as stress relaxation of virgin EPDM/40 phr reclaimed rubber blends was evaluated. According to the results of swelling test, the reclaiming process led to both crosslinks breakage and main chain scission. The appropriate reclaiming conditions were determined as the highest screw speed (120 rpm) and reclaiming agent content (3 phr). Compared to virgin EPDM vulcanizates, the curing behavior of prepared blends showed that the addition of reclaimed rubber had no effect on the scorch time but increased the optimum cure time and decreased the cure rate index. The results obtained for mechanical properties demonstrated that the tensile strength, modulus at 100% and 200% elongation and hardness decreased while the elongation at break of the blends showed no particular trend. The analysis of stress relaxation behavior using the Generalized Maxwell Model (GMM) revealed that the initial and final moduli of all blends decreased, and surprisingly the relaxation times were shorter or showed no change compared to the reference sample. Further, the Dynamic Mechanical Thermal Analysis (DMTA) results exhibited that the Tg of blends decreased but the maximum loss tangent presents no change following the addition of 40 phr reclaimed rubber to the virgin EPDM. Finally, the frequency sweep test indicated that the storage modulus of all blends was lower than that of the virgin sample.
format	article
author	Atefeh Salimi Foroud Abbassi-Sourki Mohammad Karrabi Mir Hamid Reza Ghoreishy
author_facet	Atefeh Salimi Foroud Abbassi-Sourki Mohammad Karrabi Mir Hamid Reza Ghoreishy
author_sort	Atefeh Salimi
title	Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)
title_short	Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)
title_full	Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)
title_fullStr	Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)
title_full_unstemmed	Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)
title_sort	investigation on viscoelastic behavior of virgin epdm/ reclaimed rubber blends using generalized maxwell model (gmm)
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/b1b3e227948744fc9e57200fcdd4fc32
work_keys_str_mv	AT atefehsalimi investigationonviscoelasticbehaviorofvirginepdmreclaimedrubberblendsusinggeneralizedmaxwellmodelgmm AT foroudabbassisourki investigationonviscoelasticbehaviorofvirginepdmreclaimedrubberblendsusinggeneralizedmaxwellmodelgmm AT mohammadkarrabi investigationonviscoelasticbehaviorofvirginepdmreclaimedrubberblendsusinggeneralizedmaxwellmodelgmm AT mirhamidrezaghoreishy investigationonviscoelasticbehaviorofvirginepdmreclaimedrubberblendsusinggeneralizedmaxwellmodelgmm
_version_	1718415996705832960

Investigation on viscoelastic behavior of virgin EPDM/ reclaimed rubber blends using Generalized Maxwell Model (GMM)

Ejemplares similares