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Mechanism of morphological transition from lamellar/perforated layer to gyroid phases

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Abstract

We investigated epitaxial relations of phase transitions between the lamellar (L), hexagonally perforated layers (HPL), and gyroid (G) morphologies in styrene-isoprene diblock copolymer (PSI) and polyisoprene (PI)/PSI blend using rheology and small angle X-ray scattering (SAXS) techniques. In HPL→G transitions, six spot patterns of G phase were observed in two-dimensitional SAXS pattern. On the other hand, in direct L→G transition without appearance of HPL phase, the polydomain patterns of G phase were observed. From present study, it was understood that direct L→G transition of blend may be suppressed by high-energy barrier of transition and mismatches in domain orientation between epitaxially related lattice planes.

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Authors and Affiliations

  1. Department of Materials Science & Engineering, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Jong-Hyun Ahn & Wang-Cheol Zin

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  1. Jong-Hyun Ahn
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  2. Wang-Cheol Zin
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Ahn, JH., Zin, WC. Mechanism of morphological transition from lamellar/perforated layer to gyroid phases. Macromol. Res. 11, 152–156 (2003). https://doi.org/10.1007/BF03218345

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  • DOI: https://doi.org/10.1007/BF03218345

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