NDLI: NMR and DSC study of temperature-induced phase transition in aqueous solutions of poly(N-isopropylmethacrylamide-co-acrylamide) copolymers

Content Provider	Springer Nature Link
Author	Šťastná, Julie Hanyková, Lenka Spěváček, Jiří
Copyright Year	2012
Abstract	Combination of 1H NMR spectroscopy and differential scanning calorimetry (DSC) was used to investigate temperature-induced phase transition in D2O solutions of poly(N-isopropylmethacrylamide-co-acrylamide) random copolymers. Both the NMR and DSC data showed dependence on the acrylamide (AAm) content in the copolymer; with increasing AAm content, the phase transition is shifted to higher temperatures, and both phase-separated fractions determined by NMR and change of the enthalpy determined by DSC decrease faster than the content of thermosensitive N-isopropylmethacrylamide (NIPMAm) units in the copolymer. NMR data were used to construct van't Hoff plots, and changes of the enthalpy ΔH and entropy ΔS, characterizing the phase transition, were determined. As it follows from comparison of NMR and DSC thermodynamical parameters (ΔH values), the size of the cooperative units (domains), undergoing the transition as a whole, decreases with increasing AAm content in the copolymer since the NIPMAm collapsed domains are separated by regions with hydrated AAm and surrounding NIPMAm sequences.
Starting Page	1811
Ending Page	1817
Page Count	7
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	290
Issue Number	17
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-07
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Temperature-induced phase transition Thermosensitive copolymer Poly(N-isopropylmethacrylamide-co-acrylamide) 1H NMR spectroscopy DSC Food Science Physical Chemistry Soft and Granular Matter, Complex Fluids and Microfluidics Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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