Structure-in-structure self-assembly of triblock polymers with amphiphilic random mid-block
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Block polymer self-assembly provides a variety of nanostructures with controllable length scale and morphology. The incompatibility between adjacent blocks determines the phase of linear block copolymers. Different self-assembly behaviors were observed when a single (A-co-B) block with long side chains was combined with different C blocks to simultaneously induce microphase separation between adjacent blocks and self-assembly within the blocks. Polystyrene (PS) blocks were introduced at both ends of the amphiphilic random copolymer block, which can form micellar self-assembly. Triblock polymers exhibited structure and properties in water determined by competition between block segregation and micellar self-assembly of the mid-block, depending on the fraction of the PS block. These polymer hydrogels have the potential as soft materials with improved physical properties, opening opportunities for various applications.