NDLI: Fourier transform IR spectroscopic study on phase transitions of copolymers of N-isopropylacrylamide and alkyl acrylates in water

Content Provider	Springer Nature Link
Author	Maeda, Yasushi Tsubota, Miki Ikeda, Isao
Copyright Year	2003
Abstract	Copolymers of N-isopropylacrylamide (IPA) and alkyl acrylates [methyl acrylate (MA), ethyl acrylate, and butyl acrylate] or vinyl acetate have been prepared and their phase transitions in water have been observed by means of IR spectroscopy. The incorporation of these alkyl acrylates into a poly(IPA) (PIPA) chain induces a decrease in the phase-transition temperatures, T p, and the magnitude increases with increasing size of the alkyl chains. The profiles of the C=O stretching absorption bands of the ester groups [ν(C=O)ester] and the IR bands due to IPA units exhibit critical changes at the T p of these copolymers. The ν(C=O)ester bands shift slightly toward higher wavenumbers (blueshift) upon phase transition, while the amide I and amide II bands of the IPA units undergo a blueshift and a redshift, respectively. Analysis of the ν(C=O)ester band of PIPA–MA by using a curve-fitting method shows that it consists of three components, at 1,703, 1,720, and 1,738 cm–1. The relative peak area of the largest component (1,720 cm–1) is almost constant, and those of the 1,703-cm–1 and 1,738-cm–1 components increase and decrease with increasing temperature during the phase transition, respectively. However, the changes are rather small, suggesting that changes in hydrogen bonding of the C=O groups of MA units upon phase transition are not significant. The ν(C=O)ester bands of other comonomers examined here also exhibit similar changes. The situation is consistent with the change in the hydration states of the amide groups of IPA units, most of which associate with water molecules through hydrogen bonds even after the phase separation.
Starting Page	79
Ending Page	83
Page Count	5
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	281
Issue Number	1
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-09-04
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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