Effects of Chain Topology on the Self-Assembly of AB-Type Block Copolymers

• DOI: 10.1021/acs.macromol.7b02389
• Publication Date: 2018-02-15T17:57:58Z
• Authors: Wenbo Jiang; Yicheng Qiang; Weihua Li; Feng Qiu; An-Chang Shi
• Keywords: Gyroid; Tethering; Chain (unit)

The effects of chain topology on the self-assembly block copolymers are examined using an ABAT copolymer, composed AB diblock copolymer with extra A tethered onto B block, as a model system. is regulated by tethering point, such that changes continuously from linear ABA triblock to A2B miktoarm star position moves end junction. phase diagrams different positions constructed self-consistent field theory. theoretical results reveal behavior system depends sensitively copolymers. In particular, considerably wide stable region perforated lamellar (PL) predicted for proper positions. PL could even completely replaces gyroid at relatively strong segregation. Furthermore, large window hexagonally close-packed (hcp) spherical phase, well direct transition hcp cylindrical predicted. An analysis distributions blocks reveals local segregation two occurs accommodate topological constraints due architecture, which in turn regulates interfacial curvature and packing resulting behaviors.