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CO 2 ‐Induced Morphological Transition of Co‐Assemblies from Block‐Random Segmented Polymers
Author(s) -
Yin Hongyao,
Wang Wei,
Mu Meng,
Feng Yujun
Publication year - 2017
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.201700437
Subject(s) - copolymer , micelle , methacrylate , ethylene oxide , polymer chemistry , materials science , polymer , janus , solvent , acrylic acid , oxide , styrene , chemical engineering , chemistry , aqueous solution , organic chemistry , nanotechnology , composite material , engineering , metallurgy
The co‐assembly process is an effective approach to construct hierarchically nanostructured soft materials, but morphological transition of co‐assemblies upon external stimuli, particularly the “green” trigger CO 2 , is not unraveled yet. Here, a segmented copolymer, poly(styrene)‐ block ‐poly[(4‐vinyl pyridine)– random ‐((2‐(diethylamino)ethyl methacrylate)] (P1), is used to co‐assemble in the mixed solvent of dimethyl formamide and water with poly(ethylene oxide)‐ block ‐poly[(4‐vinyl pyridine)– random ‐((2‐(diethylamino)ethyl methacrylate)] (P2) and poly(ethylene oxide)‐ block ‐poly(acrylic acid) (P3), respectively. It is found that Janus micelles are generated from the P1–P2 pair in the presence of ferric ion, while wormlike micelles are formed from the P1–P3 duad. Upon stimulation with CO 2 , Janus and wormlike aggregates are transferred into core–shell and spherical micelles, respectively.