Linear viscoelastic properties of olefinic thermoplastic elastomer blends: melt state properties

The linear viscoelastic properties of two types of olefinic thermoplastic elastomer blends were studied using dynamic rheology. The first type consists of a blend of PP, SEBS and oil and has a co-continuous morphology. The second type consists of vulcanised EPDM particles dispersed in a PP matrix. T...

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Bibliographic Details
Published in:Polymer (Guilford) 2004-12, Vol.45 (26), p.8881-8891
Main Authors: Sengers, W.G.F., Sengupta, P., Noordermeer, J.W.M., Picken, S.J., Gotsis, A.D.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Morphology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology
Rheology and viscoelasticity
Thermoplastic elastomer
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Summary:The linear viscoelastic properties of two types of olefinic thermoplastic elastomer blends were studied using dynamic rheology. The first type consists of a blend of PP, SEBS and oil and has a co-continuous morphology. The second type consists of vulcanised EPDM particles dispersed in a PP matrix. The dynamic rheological behaviour of the blends is a weighted contribution of the properties of the two individual phases. In both blend types, the storage modulus at low frequencies can be correlated to the properties and morphology of the elastomer phase. With increasing PP or oil content in the blend the value of the modulus at low frequencies are reduced. The mechanical models of Coran and Veenstra are able to describe the dynamic moduli. An additional parameter was included to determine the oil concentration in the two phases. The model parameters are correlated to the composition and the morphology.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2004.10.030