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Reconstruction of Block Copolymer Micelles to Long‐Range Ordered Dense Nanopatterns Via Light‐Tunable Hydrogen‐Bonding Association
Author(s) -
Guo Lei,
Ding Yi,
Han Jie,
Xu Na,
Lu Xinhua,
Cai Yuanli
Publication year - 2015
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.201500219
Subject(s) - micelle , copolymer , materials science , mesoscopic physics , nanostructure , self assembly , chemical engineering , hydrogen bond , nanorod , lamellar structure , polymer chemistry , nanotechnology , chemical physics , molecule , chemistry , polymer , organic chemistry , composite material , aqueous solution , physics , quantum mechanics , engineering
Controlling the orientation and long‐range order of nanostructures is a key issue in the self‐assembly of block copolymer micelles. Herein, a versatile strategy is presented to transform one‐component oxime‐based block copolymer micelles into long‐range ordered dense nanopatterns. Photoisomerization provides a straightforward and versatile approach to convert the hydrogen‐bonding association from inward dimerization ( E ‐type oxime motifs, slightly desolvated in ethyl acetate) into outward interchain association ( Z ‐type ones, highly desolvated in ethyl acetate). This increases the glass transition temperature in bulk and converts swollen micelles into compact spherical micelles in solution. The reconstruction of these micelles on various substrates demonstrates that the phase transformation enables reconstruction of spherical micelles into mesoscopic sheets, nanorods, nanoworms, nanowires, networks, and eventually into long‐range ordered and densely packed textile‐like and lamellar nanopatterns on a macroscopic scale by adjusting E / Z ‐oxime ratio and solvent‐evaporation rate.