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- W2047754728 abstract "The cylinder-to-gyroid transition in a block copolymer solution has been studied using a combination of rheology and small-angle X-ray scattering (SAXS). A poly(styrene-b-isoprene) diblock copolymer with block molecular weights of 11 000 and 32 000 g/mol, respectively, dissolved in the styrene-selective solvent di-n-butyl phthalate (DBP) at a volume fraction of 0.67 exhibits an order−order transition between hexagonally packed cylinders (C) and the cubic gyroid phase (G) at 74 ± 3 °C. A shear-oriented C phase transforms to G epitaxially, as previously established in melts. For shallow quenches into G, the transition proceeds directly by a nucleation and growth process. For deeper quenches, a metastable intermediate structure appears, with scattering and rheological features consistent with the hexagonally perforated layer (HPL) state. The appearance of the HPL state beyond a certain quench depth is reconciled with previous experiments and theory for the lamellar (L)-to-gyroid transition. The C → G transition follows the same pathways, and at approximately the same rates, even when the initial C phase is not shear-oriented. The transition rates are quantified as a function of quench depth. The reverse G → C transition demonstrates a memory of the initial cylinder orientation that persists even after annealing the G phase for 48 h. The results are discussed and compared with related work in the literature." @default.
- W2047754728 created "2016-06-24" @default.
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- W2047754728 date "2002-07-24" @default.
- W2047754728 modified "2023-10-14" @default.
- W2047754728 title "Kinetics and Mechanisms for the Cylinder-to-Gyroid Transition in a Block Copolymer Solution" @default.
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- W2047754728 doi "https://doi.org/10.1021/ma0205212" @default.
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