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pH‐ and thermo‐responsive properties of poly( N ‐vinylcaprolactam‐ co ‐acrylic acid) copolymers
Author(s) -
Shtanko Nadejda I,
Lequieu Wouter,
Goethals Eric J,
Du Prez Filip E
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1347
Subject(s) - copolymer , fourier transform infrared spectroscopy , cloud point , titration , gel permeation chromatography , acrylic acid , polymer chemistry , aqueous solution , chemistry , materials science , polymer , chemical engineering , organic chemistry , engineering
Copolymers with both pH‐ and thermo‐responsiveness were synthesized by free radical copolymerization of N ‐vinylcaprolactam with small amounts of acrylic acid. The copolymers have been prepared in various solvents and characterized by gel permeation chromatography, Fourier‐transform infrared (FTIR) spectroscopy and titration. The phase separation behaviour of these copolymers was studied in water and buffered solutions at a variety of pH values and temperatures by means of attenuated total reflectance FTIR and cloud‐point measurements. The aqueous solutions of the copolymers showed a temperature, pH and molecular weight dependent phase‐separation behaviour. Copyright © 2003 Society of Chemical Industry