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Interplay between Hydrogen Bonding and Macromolecular Architecture Leading to Unusual Phase Behavior in Thermosensitive Microgels
Author(s) -
Keerl Martina,
Smirnovas Vytautas,
Winter Roland,
Richtering Walter
Publication year - 2007
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200703728
Subject(s) - hydrogen bond , intermolecular force , copolymer , polymer , intramolecular force , materials science , fourier transform infrared spectroscopy , chemical physics , macromolecule , phase (matter) , phase transition , polymer chemistry , chemical engineering , shell (structure) , poly(n isopropylacrylamide) , chemistry , molecule , organic chemistry , thermodynamics , composite material , biochemistry , engineering , physics
In a depressed state : The intra‐ and intermolecular hydrogen‐bonding pattern of microgels comprising N ‐isopropylacrylamide (NIPAM) and N , N ‐diethylacrylamide (DEAAM) can be determined by FTIR spectroscopy. In contrast to core–shell systems (see picture, right), an increase in intramolecular hydrogen bonding in copolymer microgels (left) favors polymer–polymer interactions and leads to a marked depression of the phase‐transition temperature.