Rheology/morphology relationship of plasticized and nonplasticized thermoplastic elastomers based on ethylene-propylene-diene-terpolymer and polypropylene

The rheology/morphology relationship of plasticized and nonplasticized ethylene-propylene-diene-terpolymer/polypropylene (EPDM/PP) TPOs was studied. The aim was to investigate the effect of a plasticizer on the morphology, specially on the co-continuity interval of these blends. The addition of a pl...

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Veröffentlicht in:Polymer engineering and science 2011-11, Vol.51 (11), p.2314
Hauptverfasser: Shahbikian, Shant, Carreau, Pierre J, Marie-Claude, Heuzey, Ellul, Maria D, Nadella, Hari P, Cheng, John, Shirodkar, Pradeep
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container_end_page
container_issue 11
container_start_page 2314
container_title Polymer engineering and science
container_volume 51
creator Shahbikian, Shant
Carreau, Pierre J
Marie-Claude, Heuzey
Ellul, Maria D
Nadella, Hari P
Cheng, John
Shirodkar, Pradeep
description The rheology/morphology relationship of plasticized and nonplasticized ethylene-propylene-diene-terpolymer/polypropylene (EPDM/PP) TPOs was studied. The aim was to investigate the effect of a plasticizer on the morphology, specially on the co-continuity interval of these blends. The addition of a plasticizer increased the interconnectivity of the elastomeric phase, resulting in a rapid percolation of the EPDM at a relatively low composition range as compared to the nonplasticized counterparts. However, the addition of the plasticizer did not change the onset of the co-continuity interval in the low EPDM content side of the composition diagram. Moreover, due to plasticization, the percolation of the PP phase was delayed on the other side of the composition diagram. Large differences between the viscous and elastic properties of the constituent polymers were observed. Hence, a combination of low frequency measurements and a gel approach were crucial to characterize the co-continuity interval using rheology. The phase inversion compositions were fairlywell described by existing semi-empirical viscosity ratio-based models. Furthermore, a satisfactory prediction was obtained for the viscoelastic properties of the nonplasticized TPOs using a micro-mechanical model. However, this model failed in the case of the plasticized TPOs, due to the probable presence of a plasticized interphase. POLYM. ENG. SCI., 51:2314-2327, 2011.
doi_str_mv 10.1002/pen.2l806
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The aim was to investigate the effect of a plasticizer on the morphology, specially on the co-continuity interval of these blends. The addition of a plasticizer increased the interconnectivity of the elastomeric phase, resulting in a rapid percolation of the EPDM at a relatively low composition range as compared to the nonplasticized counterparts. However, the addition of the plasticizer did not change the onset of the co-continuity interval in the low EPDM content side of the composition diagram. Moreover, due to plasticization, the percolation of the PP phase was delayed on the other side of the composition diagram. Large differences between the viscous and elastic properties of the constituent polymers were observed. Hence, a combination of low frequency measurements and a gel approach were crucial to characterize the co-continuity interval using rheology. The phase inversion compositions were fairlywell described by existing semi-empirical viscosity ratio-based models. 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subjects Elastomers
Polymers
Properties
Rheology
Thermoplastics
title Rheology/morphology relationship of plasticized and nonplasticized thermoplastic elastomers based on ethylene-propylene-diene-terpolymer and polypropylene
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