Lamellar-to-gyroid transition in a poly(oxyethylene)–poly(oxybutylene) diblock copolymer melt

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Publication Date
DOI 10.1039/A807847E
Impact Factor 3.676
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Abstract

The transition from the lamellar (lam) to the gyroid (gyr) phase in the melt of a poly(oxyethylene)–poly(oxybutylene) (EB) diblock copolymer was shown to proceed via an intermediate perforated lamellar (pl) structure. The transition was studied starting from a shear-oriented lamellar phase using synchrotron small-angle X-ray scattering (SAXS) with simultaneous rheology. The transition occurred with a continuous variation of q*, the position of the principal peak position, although the slope of q* as a function of temperature increased in the region of the transition (pl state). In the intermediate state, the variation of q* with T was shown to be much stronger than that of the radius of gyration of EB diblocks. It was observed that the gyr phase developed from an oriented pl phase precursor as an isotropic distribution of grains. This indicates that growth of this structure did not occur epitaxially on a macroscopic scale. Finally, density images corresponding to lam, hexagonal perforated lamellar and gyr structures were generated using a single wavenumber approximation, based on the SAXS evidence that diffraction patterns are dominated by the first Fourier component.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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