NDLI: Effects of salt on the temperature and pressure responsive properties of poly(N-vinylisobutyramide) aqueous solutions

Content Provider	Springer Nature Link
Author	Suwa, K. Yamamoto, K. Akashi, M. Taka, K. Tanaka, N. Kunugi, S.
Copyright Year	1998
Abstract	We examined the effects of salt on the lower critical solution temperature (LCST) and lower critical solution pressure (LCSP) of aqueous solutions of poly (N-vinylisobutyramide), polyNVIBA, and compared them with those on poly(N-isopropylacrylamide), polyNIPAAm. We found that the addition of salt (such as Na2SO4, NaCl, or KCl) decreased the LCST of aqueous polyNVIBA from 45 °C to below 20 °C, almost linearly with the salt concentrations and dependent on the type of salt. We observed a similar concentration-dependent decrease in LCST for polyNIPAAm. When KI or NaSCN was added to each aqueous polymer solution, some smaller increases in LCST were observed at relatively low salt concentrations; higher concentrations of salt gave an almost linear decrease in LCST. As for LCSP, the addition of most types of salt lowered the transition pressure, but the effects were much more dependent on the type and the valence of the salt (especially of anion) in both polymers. Salt with divalent anion showed a larger decrease in LCSP, but those with mono valent anion showed a relatively small decrease, even showed a slight increase at lower salt concentrations in the case of polyNVIBA. Salt with I- or SCN- showed evident increases in LCSP up to 1 M and was maintained higher than the control even at 2 M. We discuss the interactions of the amide group in the side chains of polymers and water and their perturbation by ions.
Starting Page	529
Ending Page	533
Page Count	5
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	276
Issue Number	6
e-ISSN	14351536
Language	English
Publisher	Steinkopff Verlag
Publisher Date	1998-07-20
Publisher Place	Darmstadt
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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