Bridge to loop transition in a shear aligned lamellae forming heptablock copolymer

Lifeng Wu; Timothy P. Lodge; Frank S. Bates

doi:10.1021/ma048635w

Bridge to loop transition in a shear aligned lamellae forming heptablock copolymer

Lifeng Wu, Timothy P. Lodge, Frank S. Bates

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

The response to oscillatory shear of a nearly symmetric, lamellae-forming SISISIS heptablock copolymer, is described. The polymer was prepared by sequential anionic polymerization of styrene and isoprene. Transmission electron microscopy (TEM) was employed to provide real-space images of the shear-aligned specimens. The TEM results showed formation of the perpendicular morphology favoring an extended, bridging, chain conformation. The results show that there is an important connection between shear-induced microdomain alignment and molecular conformation in linear block copolymer melts.

Original language	English (US)
Pages (from-to)	8184-8187
Number of pages	4
Journal	Macromolecules
Volume	37
Issue number	22
DOIs	https://doi.org/10.1021/ma048635w
State	Published - Nov 2 2004

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10.1021/ma048635w

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abstract = "The response to oscillatory shear of a nearly symmetric, lamellae-forming SISISIS heptablock copolymer, is described. The polymer was prepared by sequential anionic polymerization of styrene and isoprene. Transmission electron microscopy (TEM) was employed to provide real-space images of the shear-aligned specimens. The TEM results showed formation of the perpendicular morphology favoring an extended, bridging, chain conformation. The results show that there is an important connection between shear-induced microdomain alignment and molecular conformation in linear block copolymer melts.",

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T1 - Bridge to loop transition in a shear aligned lamellae forming heptablock copolymer

AU - Wu, Lifeng

AU - Lodge, Timothy P.

AU - Bates, Frank S.

PY - 2004/11/2

Y1 - 2004/11/2

N2 - The response to oscillatory shear of a nearly symmetric, lamellae-forming SISISIS heptablock copolymer, is described. The polymer was prepared by sequential anionic polymerization of styrene and isoprene. Transmission electron microscopy (TEM) was employed to provide real-space images of the shear-aligned specimens. The TEM results showed formation of the perpendicular morphology favoring an extended, bridging, chain conformation. The results show that there is an important connection between shear-induced microdomain alignment and molecular conformation in linear block copolymer melts.

AB - The response to oscillatory shear of a nearly symmetric, lamellae-forming SISISIS heptablock copolymer, is described. The polymer was prepared by sequential anionic polymerization of styrene and isoprene. Transmission electron microscopy (TEM) was employed to provide real-space images of the shear-aligned specimens. The TEM results showed formation of the perpendicular morphology favoring an extended, bridging, chain conformation. The results show that there is an important connection between shear-induced microdomain alignment and molecular conformation in linear block copolymer melts.

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JO - Macromolecules

JF - Macromolecules

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ER -

Bridge to loop transition in a shear aligned lamellae forming heptablock copolymer

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