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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lindsay, Aaron P.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2024Particle Dynamics in a Diblock-Copolymer-Based Dodecagonal Quasicrystal and Its Periodic Approximant by X-Ray Photon Correlation Spectroscopycitations
- 2022Tuning Diblock Copolymer Particle Packing Symmetry with Variable Molecular Weight Core-Homopolymerscitations
- 2021Quasicrystals and Their Approximants in a Crystalline–Amorphous Diblock Copolymercitations
- 2020Formation of a C15 laves phase with a giant unit cell in salt-doped A/B/Ab ternary polymer blendscitations
- 2020A15, σ, and a Quasicrystalcitations
- 2020Emergence of a C15 Laves Phase in Diblock Polymer/Homopolymer Blendscitations
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article
Tuning Diblock Copolymer Particle Packing Symmetry with Variable Molecular Weight Core-Homopolymers
Abstract
<p>We report the sensitivity of diblock copolymer particle packing symmetry to the ratio α = N<sub>homo</sub>/N<sub>core</sub>, where N<sub>homo</sub>and N<sub>core</sub>are the respective homopolymer and core-block degrees of polymerization. Three poly(ethylene oxide)-b-poly(2-ethylhexyl acrylate) (OA) diblock copolymers with O volume fractions f<sub>O</sub>= 0.15, 0.16, and 0.20 were blended with O homopolymers characterized by α = 0.23, 0.42, 0.80, and 1.00. Small-angle X-ray scattering revealed rich phase behavior as a function of α, the overall particle core volume fraction (f<sub>core</sub>), and temperature. BCC, HCP, and Frank-Kasper σ, C14, C15, and dodecagonal quasicrystal phases, were all identified. "Dry-brush" homopolymer distribution (α = 0.80 and 1.00) favor C14 and C15 phases with macrophase separation at high homopolymer loadings. "Wet-brush" homopolymer distributions in the particle cores (α = 0.42) lead to narrow σ or C15 windows and cylinders at greater O concentrations. Solvent-like swelling (α = 0.23) favors widespread σ phase formation.</p>