화학공학소재연구정보센터
Macromolecules, Vol.52, No.21, 8374-8383, 2019
Competing Hydrogen Bonding Interaction Creates Hierarchically Ordered Self-Assembled Structures of PMMA-b-P4VP/PVPh-b-PS Mixtures
In this study, poly(methyl methacrylate-b-4-vinylpyridine) (PMMA-b-P4VP) and poly(vinylphenol-bstyrene) (PVPh-b-PS) block copolymers were synthesized through anionic living polymerization; together, they featured one hydrogen bonded donor segment (PVPh) and two hydrogen bonded acceptors (PMMA and P4VP). Initially we investigated diblock copolymer/homopolymer blends of PMMA-b-P4VP/PVPh blends, where PVPh homopolymer (C) could act as the common solvent for PMMA-b-P4VP (Ab-B) copolymer. Short range ordered of self-assembled structure formed for pure PMMA-b-P4VP copolymer and for its blends with PVPh at lower concentrations; at higher PVPh concentrations, however, miscible disordered structures formed because of OH units of PVPh both interacted with P4VP and PMMA segments. In addition, blending the immiscible PMMA-b-P4VP into the PVPh-b-PS diblock copolymer resulted in full morphological transitions: from the lamellae, double gyroid, cylinder, sphere, and, finally, to disordered structures. Therefore, the AK effects for competitive hydrogen bonding among PVPh/PMMA and PVPh/P4VP binary pairs, these PMMA-b-P4VP/PVPh-b-PS blends exhibited several hierarchical nanostructures, including core/shell (coaxial) cylinder, cylinder-in-lamellae, and core/shell double-gyroid structures.