Rheology and the Microphase Separation Transition in Styrene-Isoprene Block Copolymers

J. La Monte Adams; William W. Graessley; Richard A. Register

doi:10.1021/ma00099a014

Rheology and the Microphase Separation Transition in Styrene-Isoprene Block Copolymers

J. La Monte Adams, William W. Graessley, Richard A. Register

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Abstract

We have used dynamic oscillatory measurements to locate the temperature of the microphase separation transitio (T_MST) for a series of nearly monodisperse styrene-isoprene diblock (SI) and triblock (SIS) copolymers, all containing 13 wt % styrene and ranging in molecular weight from 48K to 149K. The microphase-separated morphology in all cases is a disordered (liquidlike) arrangement of polystyrene spheres in a polyisoprene matrix, as determined by small-angle X-ray scattering. Values of T_MST were obtained from isochronal plots of the storage modulus versus temperature. The marked change in slope at the MST demonstrates that even materials with a disordered microdomain structure can experience significant property changes when the MST is traversed. The diblock and triblock T_MST values are consistent with a single ϰ(T) relation, indicating that large-scale polymer architecture has little effect on ϰ.

Original language	English (US)
Pages (from-to)	6026-6032
Number of pages	7
Journal	Macromolecules
Volume	27
Issue number	21
DOIs	https://doi.org/10.1021/ma00099a014
State	Published - Oct 1 1994

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Rheology and the Microphase Separation Transition in Styrene-Isoprene Block Copolymers",

abstract = "We have used dynamic oscillatory measurements to locate the temperature of the microphase separation transitio (TMST) for a series of nearly monodisperse styrene-isoprene diblock (SI) and triblock (SIS) copolymers, all containing 13 wt % styrene and ranging in molecular weight from 48K to 149K. The microphase-separated morphology in all cases is a disordered (liquidlike) arrangement of polystyrene spheres in a polyisoprene matrix, as determined by small-angle X-ray scattering. Values of TMST were obtained from isochronal plots of the storage modulus versus temperature. The marked change in slope at the MST demonstrates that even materials with a disordered microdomain structure can experience significant property changes when the MST is traversed. The diblock and triblock TMST values are consistent with a single ϰ(T) relation, indicating that large-scale polymer architecture has little effect on ϰ.",

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T1 - Rheology and the Microphase Separation Transition in Styrene-Isoprene Block Copolymers

AU - Adams, J. La Monte

AU - Graessley, William W.

AU - Register, Richard A.

PY - 1994/10/1

Y1 - 1994/10/1

N2 - We have used dynamic oscillatory measurements to locate the temperature of the microphase separation transitio (TMST) for a series of nearly monodisperse styrene-isoprene diblock (SI) and triblock (SIS) copolymers, all containing 13 wt % styrene and ranging in molecular weight from 48K to 149K. The microphase-separated morphology in all cases is a disordered (liquidlike) arrangement of polystyrene spheres in a polyisoprene matrix, as determined by small-angle X-ray scattering. Values of TMST were obtained from isochronal plots of the storage modulus versus temperature. The marked change in slope at the MST demonstrates that even materials with a disordered microdomain structure can experience significant property changes when the MST is traversed. The diblock and triblock TMST values are consistent with a single ϰ(T) relation, indicating that large-scale polymer architecture has little effect on ϰ.

AB - We have used dynamic oscillatory measurements to locate the temperature of the microphase separation transitio (TMST) for a series of nearly monodisperse styrene-isoprene diblock (SI) and triblock (SIS) copolymers, all containing 13 wt % styrene and ranging in molecular weight from 48K to 149K. The microphase-separated morphology in all cases is a disordered (liquidlike) arrangement of polystyrene spheres in a polyisoprene matrix, as determined by small-angle X-ray scattering. Values of TMST were obtained from isochronal plots of the storage modulus versus temperature. The marked change in slope at the MST demonstrates that even materials with a disordered microdomain structure can experience significant property changes when the MST is traversed. The diblock and triblock TMST values are consistent with a single ϰ(T) relation, indicating that large-scale polymer architecture has little effect on ϰ.

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Rheology and the Microphase Separation Transition in Styrene-Isoprene Block Copolymers

Abstract

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