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Polymer Bulletin
Erschienen in: Polymer Bulletin 1/2013

01.01.2013 | Original Paper

1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures

verfasst von: Hana Kouřilová, Jiří Spěváček, Lenka Hanyková

Erschienen in: Polymer Bulletin | Ausgabe 1/2013

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Abstract

1H NMR spectroscopy was used to investigate the temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) (PIPMAm/PVCL) mixtures to find out if the phase transition of the given component (PIPMAm or PVCL) is affected by the presence of the second component. Our results that PVCL and PIPMAm transitions are in polymer mixtures shifted by ~2 K towards higher temperatures in comparison with neat polymers and depend on polymer concentration show that such effect exists. Spin–spin relaxation times of water (HDO) indicate that in solutions with c ≥ 1 wt% a portion of water is predominantly bound in PVCL mesoglobules even at temperatures above the LCST transition of PIPMAm component. Water is with time released from these mesoglobules without any induction period so indicating that it is mostly indirectly bound water. We assume that there is a direct connection between character of the bound water and the transition temperatures.
Vorheriger Artikel Preparation and characterization of smart hydrogel nanocomposites sensitive to oxidation–reduction
Nächster Artikel Conductivities enhancement of poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) transparent electrodes with diol additives

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Metadaten
Titel
1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures
verfasst von
Hana Kouřilová
Jiří Spěváček
Lenka Hanyková
Publikationsdatum
01.01.2013
Verlag
Springer-Verlag
Erschienen in
Polymer Bulletin / Ausgabe 1/2013
Print ISSN: 0170-0839
Elektronische ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-012-0831-x

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