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A dodecagonal quasicrystalline (QC) morphology is identified in a poly(styrene-b-isoprene-b-styrene-b-ethylene oxide) (SISO) tetrablock terpolymer based on evidence provided by transmission electron microscopy (TEM), small-angle X-ray scattering, and dynamic mechanical spectroscopy measurements. The QC state occurs at temperatures between those associated with simple hexagonal order (HEX) and the σ-phase (P42/mnm), THEX < TQC < Tσ < TODT, where TODT is the order–disorder transition temperature. All three morphologies are formed from spherical domains containing an O core surrounded by a shell of S that screens unfavorable segment–segment interactions with an I-rich matrix. TEM analysis reveals a QC morphology with 12-fold rotational symmetry but devoid of long-range translational order, along with locally coordinated structures consistent with dodecagonal quasicrystalline approximants. The SISO molecular architecture decouples control over the domain shape and interdomain interactions, leading to a multip...
| Authors: | Jingwen Zhang; Frank S. Bates | |
| Journal: | Journal of the American Chemical Society | |
| Year: | 2012 | |
| DOI: | 10.1021/ja301770v | |
| Publication date: | 09-05-2012 |
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