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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34 Scopus citations


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 languageEnglish (US)
Pages (from-to)1147-1171
Number of pages25
JournalJournal of Rheology
Issue number5
StatePublished - Jan 1 1997


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