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Order‐Order Transition of C → sdG → sL → S in ABC Triblock Copolymer Thin Film Induced by Solvent Vapor
Author(s) -
Luo Chunxia,
Huang Weihuan,
Han Yanchun
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200800675
Subject(s) - gyroid , copolymer , lamella (surface anatomy) , materials science , phase transition , crystallography , phase (matter) , thin film , order (exchange) , block (permutation group theory) , polymer chemistry , combinatorics , chemistry , condensed matter physics , physics , nanotechnology , mathematics , polymer , composite material , organic chemistry , finance , economics
The morphology transition of polystyrene‐ block ‐poly(butadiene)‐ block ‐poly(2‐vinylpyridine) (SBV) triblock thin film induced in benzene vapor showing weak selectivity for PS is investigated. The order‐order transitions (OOT) in the sequence of core‐shell cylinders (C), sphere in ‘diblock gyroid’ (sdG), sphere in lamella (sL) and sphere (S) are observed. The projection along (111) direction in Gyroid phase (sdG(111)) is found to epitaxially grow from C(001) in the film. Instead of sdG(111), sdG(110) 0.1875 develops to the phase of sL. Consequently, the film experiences the transition sequence of sdG(111) → sdG(211) → sdG(110) 0.25 → sdG(110) 0.1875 between C and sL. The mechanism is analyzed from the total surface area of the blocks.