Abstract
Cloud point curves and θ temperatures have been determined for aqueous solutions of poly(vinylpyrrolidone) at several concentrations for a variety of inorganic salts (phosphates, monohydrogen phosphates, sulfates, carbonates, dihydrogen phosphates and fluorides). The resulting dependency of the critical temperatures θ (mostly between 289 and 350 K) on the molar concentration can be expressed as sequences showing the decreasing effect of anion species or cation species in salting out the polymer. The decreasing order of effectiveness of the anions in reducing the θ temperatures is PO 3−4 >HPO 2−4 >SO 2−4 ≈CO 2−3 >H2PO −4 >F−. The order for cation is Na+>K+. The changes brought about in θ temperatures by the salts were found to be the results of the changes taking place in the hydrophilic and hydrophobic interactions among polymer, solvent and additive salts and of the change of water structure by structure making or structure breaking ions, and of the influence of salts on the hydration sheath of the polymer.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Reppe W (1949) Neue Eutwicklungen auf dem Gebiete der Chemie des Acetylens und Kohlenoxyds. Springer, Berlin
Türker L, Güner A, Yiğit F, Güven O (1990) Colloid and Polym Sci 268:337
Molyneux P, Frank HP (1961) J Am Chem Soc 83:3169;
Jürgensen GE, Speiser P (1967) Acta Pharm Sueccia 4:185
Guttman D, Higuchi T (1961) J Pharm Sci 50:441;
Rippie EG, Lamb DJ, Roming PW (1964) ibid 53:1346
Bandyopadhyay P, Rodriguez F (1972) Polymer 13:119
Molyneux P (1975) In: Franks F (ed.) In water: A Comprehensive Treatise. Vol 4, Chap 7. Plenum, New York
Sekikawa H, Hori R, Artia T, Ito K, Nakano M (1978) Chem Pharm Bull 26(8):2489
Cornet CF, van Bollegooijen H (1966) Polymer 7:293
Talamani G, Vidoto G (1967) Makromol Chem 110:111
Napper DH (1969) Polymer 10:181
Meza R, Gargallo L (1977) Europ Polym J 13:235
Jirgenson B (1951) Macromol Chemie 6:30
Molyneux P (1966) Monograph, Soc of Chem Ind (London) 24:21
Ataman M (1987) Colloid Polym Sci 265:19
Güven O, Eltan E (1981) Makromol Chem 182:3129
Frank HS, Wen WY (1957) Discuss Faraday Soc 24:133
Verral RE ref 6(, Chap 5.
James DW, Frost RL (1978) J Chem Soc Faraday Trans 1 74:583
Hindman JC (1962) J Chem Phys 36:1000
Puett D, Rajagh LV (1968) Makromol Sci Chem A 2:111
Kobyakov VV, Ovsepyan AM, Panov VP (1981) Polym Sci USSR 23 1:168
Ise N, Okubo J (1969) J Phys Chem 73:1488
Güner A, Türker L (to be published)
Frank HP, Barkin S, Eirich FR (1957) J Phys Chem 61:1375
Author information
Authors and Affiliations
Additional information
Deceased
Rights and permissions
About this article
Cite this article
Güner, A., Ataman, M. Effects of inorganic salts on the properties of aqueous poly(vinylpyrrolidone) solutions. Colloid Polym Sci 272, 175–180 (1994). https://doi.org/10.1007/BF00658844
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00658844