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Synthesis and Self‐Assembly of Brush‐Rod Diblock Copolymers in the Mixed Solvent of THF/H 2 O
Author(s) -
Cao Hongqing,
Lin Weiran,
Liu Anhua,
Zhang Jie,
Wan Xinhua,
Zhou Qifeng
Publication year - 2007
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.200700241
Subject(s) - copolymer , ethylene glycol , amphiphile , micelle , polymer chemistry , methacrylate , styrene , solvent , methyl methacrylate , brush , materials science , self assembly , spheres , ether , chemistry , aqueous solution , nanotechnology , organic chemistry , polymer , physics , composite material , astronomy
Two amphiphilic brush‐rod block copolymers, PEGMA 37 ‐ b ‐MBPS 87 and PEGMA 37 ‐ b ‐MBPS 141 , were synthesized via ATRP of poly(ethylene glycol)monomethyl ether methacrylate (PEGMA) and (+)‐2,5‐bis[4′‐(( S )‐2‐methylbutoxy)phenyl]styrene (MBPS). The self‐assembly of the copolymers in THF/H 2 O was induced by different methods. Spheres were dominant morphologies of PEGMA 37 ‐ b ‐MBPS 87 regardless of the initial concentration and the rate of water addition. Increase of the length of hydrophobic block, as in PEGMA 37 ‐ b ‐MBPS 141 , led to the coexistence of primary spheres, large compound spherical and rod‐like micelles at a slow water addition rate. Injecting water into the THF solution of PEGMA 37 ‐ b ‐MBPS 141 quickly or pouring the THF solution into large amount of water resulted only in the formation of spheres.