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Hydrogen-Bonding Strength Influences Hierarchical Self-Assembled Structures in Unusual Miscible/Immiscible Diblock Copolymer Blends
- Tseng, Tzu-Chun, Kuo, Shiao-Wei
- Macromolecules 2018 v.51 no.16 pp. 6451-6459
- composite polymers, hydrogen bonding, mixing, nanomaterials, polymerization, polymethylmethacrylate
- We used sequential anionic living polymerization to synthesize poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) and poly(vinylphenol-b-methyl methacrylate) (PVPh-b-PMMA) diblock copolymers presenting various hydrogen bond donor or acceptor units. Upon blending with the miscible disordered PVPh-b-PMMA diblock copolymers, we observed order–order morphological transitions from the bicontinuous gyroid structure of pure PS-b-P4VP to lamellar, cylindrical, and worm-like structures, in a manner strongly dependent on the concentration and vinylphenol content of the PVPh-b-PMMA diblock copolymer. We took advantage of competitive hydrogen-bonding interactions and ΔK effects between PVPh/P4VP and PVPh/PMMA domains when blending immiscible A-b-B diblock copolymers with disordered miscible C-b-D diblock copolymers to form hierarchical self-assembled nanostructures, including three-phase lamellar and core–shell cylindrical nanostructures.