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Changes in the Hydration State of a Block Copolymer of Poly( N ‐isopropylacrylamide) and Poly(ethylene oxide) on Thermosensitive Micellization in Water
Author(s) -
Maeda Yasushi,
Taniguchi Nagisa,
Ikeda Isao
Publication year - 2001
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 - 10.1002/1521-3927(20011101)22:17<1390::aid-marc1390>3.0.co;2-z
Subject(s) - copolymer , ethylene oxide , micelle , poly(n isopropylacrylamide) , polymer chemistry , poly ethylene , polymerization , oxide , fluorescence spectroscopy , materials science , chemistry , ethylene , fluorescence , polymer , aqueous solution , organic chemistry , catalysis , physics , quantum mechanics
A diblock copolymer of poly( N ‐isopropylacrylamide) and poly(ethylene oxide) (PiPA‐ b ‐PEO) has been prepared by radical polymerization with a ceric ion initiation system. Its thermosensitive micellization has been investigated by means of IR and fluorescence spectroscopy. The PiPA segments are critically dehydrated above 33.5°C (5 wt.‐%) and associate through hydrophobic interaction to form the hydrophobic core of the micelle. In contrast, the change in the hydration state of the PEO segments upon micellization is small.