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Light‐Switching Azo‐Copolymers Self‐Assembly in Multi‐Stationary States
Author(s) -
Dong Shumin,
Sun Wen,
Wang Dongsheng,
Zhao Haiquan,
Zu Gen,
Zheng Yonghao
Publication year - 2019
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.201900058
Subject(s) - azobenzene , copolymer , polyethylene glycol , self assembly , materials science , dynamic light scattering , transmission electron microscopy , peg ratio , toluene , scanning electron microscope , polymer chemistry , chemical engineering , polymer , photochemistry , nanotechnology , chemistry , nanoparticle , organic chemistry , composite material , finance , engineering , economics
In the present research, novel tri‐block‐copolymers bearing polyethylene glycol (PEG), azobenzene (Azo), and tetra‐ ortho ‐methoxy‐substituted Azo (mAzo) segments are synthesized and explored. Light‐controlled PEG‐PmAzo‐PAzo self‐assemblies switching between multi‐stationary states is realized. Under controlling of UV, blue, green, and red light, PEG‐PmAzo‐PAzo isomerize between 4 photostationary states. The enrichment of cis isomers of Azo and mAzo induces the self‐assembly of PEG‐PmAzo‐PAzo in toluene. The morphologies and scale of the self‐assemblies can be switched between four stationary states, which are investigated by dynamic light scattering, scanning electron microscopy, and transmission electron microscopy.