Role of Strain in Controlling the Orientation Distribution in Oscillatory Shear of Diblock Copolymers as Studied by SAXS

Authors: Bodycomb, J.1; Hashimoto, T.2

Source: International Journal of Thermophysics, Volume 20, Number 3, May 1999 , pp. 857-865(9)

Publisher: Springer

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Small-angle X-ray scattering is used to examine quantitatively the distribution of lamellar orientation in shear aligned diblocks as a function of strain amplitude at constant shear duration, frequency, and temperature. At all strains, predominantly perpendicular alignment is observed with some parallel alignment. Also, there is a small amount of transverse alignment. This suggests that alignment by shear occurs at the expense of intermediate alignments followed by reducing transverse alignment. Increased strain at constant time increases the sharpness of the distribution of perpendicular alignment.

Keywords: block copolymer; orientation; shear; small-angle X-ray scattering

Document Type: Research Article

Affiliations: 1: Hashimoto Polymer Phasing Project, ERATO, JST 2: Hashimoto Polymer Phasing Project, ERATO, JST. Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan

Publication date: May 1, 1999

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