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Supramolecular Micelles and Reverse Micelles Based on Cyclodextrin Polyrotaxanes
Author(s) -
Jin Qiao,
Liu Gongyan,
Ji Jian
Publication year - 2014
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201300742
Subject(s) - micelle , chemistry , lower critical solution temperature , dynamic light scattering , atom transfer radical polymerization , copolymer , poly(n isopropylacrylamide) , polymerization , polymer chemistry , ethylene oxide , supramolecular chemistry , self assembly , chemical engineering , nanoparticle , aqueous solution , crystallography , organic chemistry , polymer , crystal structure , engineering
A new supramolecular self‐assembly approach to construct micelles and reverse micelles was reported. Double‐hydrophilic block copolymers poly(ethylene oxide)‐ b ‐poly( N ‐isopropylacrylamide) (PEO‐ b ‐PNIPAAm) was synthesized via atom transfer radical polymerization (ATRP) using PEO macroinitiator. Because of the lower critical solution temperature (LCST) phase behavior of PNIPAAm, PEO‐ b ‐PNIPAAm block copolymers self‐assembled to form PNIPAAm‐core micelles at 40°C. The PNIPAAm‐core micelles were disassembled to unimers when the temperature was decreased to 25°C. But the addition of α ‐cyclodextrins ( α ‐CDs) could induce the formation of PNIPAAm‐shell micelles because of the "channel‐type" crystallities induced by PEO/ α ‐CDs polyrotaxanes. The assembly and disassembly procedure of micelles and reverse micelles were investigated by dynamic light scattering (DLS), X‐ray diffraction (XRD), 1 H NMR and transmission electron microscopy (TEM).