Influence of shear on a lamellar triblock copolymer near the order-disorder transition

T. Tepe; D. A. Hajduk; M. A. Hillmyer; P. A. Weimann; M. Tirrell; F. S. Bates; K. Almdal; K. Mortensen

doi:10.1122/1.550819

Influence of shear on a lamellar triblock copolymer near the order-disorder transition

T. Tepe, D. A. Hajduk, M. A. Hillmyer, P. A. Weimann, M. Tirrell, F. S. Bates, K. Almdal, K. Mortensen

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Abstract

The effects of a large strain (600%) reciprocating steady shear on the lamellar orientation and the order-disorder transition of a nearly symmetric poly(ethylene propylene)-poly(ethylethylene)-poly(ethylene propylene) (PEP-PEE-PEP) triblock copolymer have been studied using small-angle neutron scattering and rheological measurements. Shearing in the ordered state produced parallel lamellae under all steady-state conditions investigated, and the lamellar-to-disorder transition temperature decreased dramatically with increasing shear rate. Both phenomena are qualitatively different from the documented behavior of PEP-PEE diblock copolymers. However, cooling the disordered material while shearing at a relatively low deformation rate initially induces perpendicular lamellae, analogous to the diblock response. These observations are considered in the contest of theory and other experimental studies.

Original language	English (US)
Pages (from-to)	1147-1171
Number of pages	25
Journal	Journal of Rheology
Volume	41
Issue number	5
DOIs	https://doi.org/10.1122/1.550819
State	Published - Jan 1 1997

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abstract = "The effects of a large strain (600%) reciprocating steady shear on the lamellar orientation and the order-disorder transition of a nearly symmetric poly(ethylene propylene)-poly(ethylethylene)-poly(ethylene propylene) (PEP-PEE-PEP) triblock copolymer have been studied using small-angle neutron scattering and rheological measurements. Shearing in the ordered state produced parallel lamellae under all steady-state conditions investigated, and the lamellar-to-disorder transition temperature decreased dramatically with increasing shear rate. Both phenomena are qualitatively different from the documented behavior of PEP-PEE diblock copolymers. However, cooling the disordered material while shearing at a relatively low deformation rate initially induces perpendicular lamellae, analogous to the diblock response. These observations are considered in the contest of theory and other experimental studies.",

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AU - Tepe, T.

AU - Hajduk, D. A.

AU - Hillmyer, M. A.

AU - Weimann, P. A.

AU - Tirrell, M.

AU - Bates, F. S.

AU - Almdal, K.

AU - Mortensen, K.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - The effects of a large strain (600%) reciprocating steady shear on the lamellar orientation and the order-disorder transition of a nearly symmetric poly(ethylene propylene)-poly(ethylethylene)-poly(ethylene propylene) (PEP-PEE-PEP) triblock copolymer have been studied using small-angle neutron scattering and rheological measurements. Shearing in the ordered state produced parallel lamellae under all steady-state conditions investigated, and the lamellar-to-disorder transition temperature decreased dramatically with increasing shear rate. Both phenomena are qualitatively different from the documented behavior of PEP-PEE diblock copolymers. However, cooling the disordered material while shearing at a relatively low deformation rate initially induces perpendicular lamellae, analogous to the diblock response. These observations are considered in the contest of theory and other experimental studies.

AB - The effects of a large strain (600%) reciprocating steady shear on the lamellar orientation and the order-disorder transition of a nearly symmetric poly(ethylene propylene)-poly(ethylethylene)-poly(ethylene propylene) (PEP-PEE-PEP) triblock copolymer have been studied using small-angle neutron scattering and rheological measurements. Shearing in the ordered state produced parallel lamellae under all steady-state conditions investigated, and the lamellar-to-disorder transition temperature decreased dramatically with increasing shear rate. Both phenomena are qualitatively different from the documented behavior of PEP-PEE diblock copolymers. However, cooling the disordered material while shearing at a relatively low deformation rate initially induces perpendicular lamellae, analogous to the diblock response. These observations are considered in the contest of theory and other experimental studies.

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Influence of shear on a lamellar triblock copolymer near the order-disorder transition

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