Premium
NMR Study on Polymer‐Solvent Interactions during Temperature‐Induced Phase Separation in Aqueous Polymer Solutions
Author(s) -
Spěváček Jiří,
Hanyková Lenka
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750510
Subject(s) - aqueous solution , polymer , bound water , solvent , ether , chemistry , molecule , phase (matter) , polymer chemistry , relaxation (psychology) , analytical chemistry (journal) , organic chemistry , psychology , social psychology
Some possibilities of NMR spectroscopy (mainly spin‐spin relaxation) in investigations of hydration and other polymer‐solvent interactions during the temperature‐induced phase separation in aqueous polymer solutions are described. A certain portion of water molecules bound in phase‐separated mesoglobules was revealed. The residence time of the bound HDO for poly(vinyl methyl ether) (PVME)/D 2 O solution ( c = 6 wt%) is 1.2 ms. With time a slow release of originally bound water from the respective mesoglobules was observed. For highly concentrated PVME/D 2 O solutions ( c = 20–60 wt%), the residence time of bound HDO ≫ 2.7 ms and fractions of bound water unchanged even for 70 h were found. A similar behaviour as described above for water (HDO) was also found for EtOH molecules in PVME/D 2 O/EtOH solutions.