Dynamics of shear-induced orientation transitions in block copolymers

J. Stasiak, M. R. Mackley, A. M. Squires, V. Castelletto, I. W. Hamley, G. D. Moggridge

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1 Citation (SciVal)

Abstract

This research investigates the dynamics of mechanical and structural transformations of styrene–butadiene–styrene block copolymer, known as RCM1, which has cylindrical mesophase morphology. The polymer was processed using a Multipass Rheometer (MPR) with simultaneous X-ray observation. The method allowed investigation of the dynamics with 1 second time resolution. Samples were processed at 160 °C and an apparent wall shear rate in the range ∼1.4 to 1125 s−1. Microstructural alignment was quantified using a second order X-ray orientation function. The polymer showed self-organization in the melt, aligning along the capillary walls. Shear flow disrupted the organization, which then rebuilt during the post-shearing pause, as the residual pressure relaxed across the capillary. The dynamics of structure ordering and disordering was a function of shear rate. The transition was faster for high shear rate cycles
Original languageEnglish
Pages (from-to)1941-1947
JournalSoft Matter
Volume6
Issue number9
DOIs
Publication statusPublished - 1 Jan 2010

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