Abstract
In this work we prepared poly(styrene–b–vinylphenol) (PS-b-PVPh) by sequential anionic living polymerization and poly(ethylene oxide-b-4-vinylpyridine) (PEO-b-P4VP) by reversible addition fragmentation chain transfer polymerization (RAFT) by using poly(ethylene oxide) 4-cyano-4-(phenylcarbonothioylthio)pentanoate (PEO-SC(S)Ph) as a macroinitiator with two hydrogen bonded acceptor groups. When blending with disordered PEO-b-P4VP diblock copolymer, we found the order-order self-assembled structure transition from lamellar structure for pure PS-b-PVPh to cylindrical, worm-like, and finally to PEO crystalline lamellar structures. Taking the advantage of the ΔK effect from competitive hydrogen bonding strengths between PVPh/P4VP and PVPh/PEO domains, it could form the hierarchical self-assembled morphologies such as core–shell cylindrical nanostructure.
Highlights
Diblock copolymers can display different self-assembly behaviors, including lamellar, gyroid, cylinder, and spherical nanostructures, which possess several potential applications in drug delivery, photonic crystals, and nanotechnology [1,2,3,4]
Blends including PS-b-PVPh blending with poly(methyl methacrylate) (PMMA), polycaprolactone (PCL), PEO, P2VP, and P4VP homopolymers; PS-b-P2VP, and PCL-b-P4VP diblock copolymers blending PVPh homopolymer; PVPh-b-PCL or PVPh-b-PMMA blending with PVP homopolymer [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]
We propose another immiscible PS-b-PVPh diblock copolymer blend with disordered PEO-b-P4VP diblock copolymer, which is mediated by using competitive hydrogen bonding strength to form the hierarchical self-assembled structures
Summary
Diblock copolymers can display different self-assembly behaviors, including lamellar, gyroid, cylinder, and spherical nanostructures, which possess several potential applications in drug delivery, photonic crystals, and nanotechnology [1,2,3,4]. Mediating the different molecular weights of each block segment to control the volume fraction by using living polymerization methods may be time-consuming and difficult and blending the homopolymer or another block copolymer through intermolecular hydrogen bonding interactions has received much interest recently [5,6,7]. In our previous work [39], we proposed immiscible PS-b-P4VP blending with miscible disordered PVPh-b-PMMA to form hierarchical self-assembled structures such as three lamellar or core–shell cylinder nanostructures. We propose another immiscible PS-b-PVPh diblock copolymer blend with disordered PEO-b-P4VP diblock copolymer, which is mediated by using competitive hydrogen bonding strength to form the hierarchical self-assembled structures
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