Rheology and tube model theory of bimodal blends of star polymer melts

B. Blottière; T. C.B. McLeish; A. Hakiki; R. N. Young; S. T. Milner

doi:10.1021/ma980093t

Rheology and tube model theory of bimodal blends of star polymer melts

B. Blottière, T. C.B. McLeish, A. Hakiki, R. N. Young, S. T. Milner

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42 Scopus citations

Abstract

Experiments on solution-cast blends of two anionically synthesized monodisperse star-shaped polyisoprene molecules of widely different molecular weight exhibit a very rich rheological behavior. The time-dependent moduli are exponentially dependent on the relative volume fraction of each species. This work models these new features by extending existing theories for monodisperse melt of star polymers to the blend of two monodisperse star polymers with different molecular weight, keeping the same chemistry The theory is based on the tube model with constraint release for star polymers in both an approximate and then a more exact level. The latter, with its treatment of nonactivated as well as activated breathing modes, is able to account quantitatively for the huge range of blend rheologies. With no extra parameters, it is able to account qualitatively for relaxation times and entire relaxation functions that vary over many orders of magnitude on blending.

Original language	English (US)
Pages (from-to)	9295-9304
Number of pages	10
Journal	Macromolecules
Volume	31
Issue number	26
DOIs	https://doi.org/10.1021/ma980093t
State	Published - Dec 29 1998

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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abstract = "Experiments on solution-cast blends of two anionically synthesized monodisperse star-shaped polyisoprene molecules of widely different molecular weight exhibit a very rich rheological behavior. The time-dependent moduli are exponentially dependent on the relative volume fraction of each species. This work models these new features by extending existing theories for monodisperse melt of star polymers to the blend of two monodisperse star polymers with different molecular weight, keeping the same chemistry The theory is based on the tube model with constraint release for star polymers in both an approximate and then a more exact level. The latter, with its treatment of nonactivated as well as activated breathing modes, is able to account quantitatively for the huge range of blend rheologies. With no extra parameters, it is able to account qualitatively for relaxation times and entire relaxation functions that vary over many orders of magnitude on blending.",

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AU - Blottière, B.

AU - McLeish, T. C.B.

AU - Hakiki, A.

AU - Young, R. N.

AU - Milner, S. T.

PY - 1998/12/29

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AB - Experiments on solution-cast blends of two anionically synthesized monodisperse star-shaped polyisoprene molecules of widely different molecular weight exhibit a very rich rheological behavior. The time-dependent moduli are exponentially dependent on the relative volume fraction of each species. This work models these new features by extending existing theories for monodisperse melt of star polymers to the blend of two monodisperse star polymers with different molecular weight, keeping the same chemistry The theory is based on the tube model with constraint release for star polymers in both an approximate and then a more exact level. The latter, with its treatment of nonactivated as well as activated breathing modes, is able to account quantitatively for the huge range of blend rheologies. With no extra parameters, it is able to account qualitatively for relaxation times and entire relaxation functions that vary over many orders of magnitude on blending.

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Rheology and tube model theory of bimodal blends of star polymer melts

Abstract

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