Premium
Micellization of St/MMA Gradient Copolymers: A General Picture of Structural Transitions in Gradient Copolymer Micelles
Author(s) -
Zheng Chao,
Huang Haiying,
He Tianbai
Publication year - 2013
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.201300553
Subject(s) - micelle , copolymer , materials science , polymer chemistry , polymerization , chain transfer , styrene , methyl methacrylate , dynamic light scattering , radical polymerization , chemical engineering , chemistry , organic chemistry , composite material , polymer , aqueous solution , nanotechnology , nanoparticle , engineering
In this work, a gradient copolymer of styrene (St) and methyl methacrylate (MMA) is synthesized via reversible addition–fragmentation chain transfer living radical polymerization and its micellization behaviors in an acetone and water mixture are investigated by transmission electron microscopy, light scattering, and NMR spectroscopy. Three different kinds of transitions were found to coexist in a single system for the first time: a unimers to micelles transition, a star‐like micelles to crew‐cut micelles transition resulting from the shrinkage of micelles, and morphological transitions from spherical micelles to cylindrical micelles to vesicles. Our findings provide a general picture of structural transitions and relaxation processes in gradient copolymer micelles, which can lead to the development of novel materials and applications based on gradient copolymers.