%0 Journal Article %1 MOE1993 %A MOE, S. T. %A SKJAKBRAEK, G. %A ELGSAETER, A. %A SMIDSROD, O. %C 1155 16TH ST, NW, WASHINGTON, DC 20036 %D 1993 %I AMER CHEMICAL SOC %J Macromolecules %K ;; [ISI:] agar changes; gels; phase-transition; predictions; starch; temperature-sensitive thermodynamic volume %N 14 %P 3589 -- 3597 %T SWELLING OF COVALENTLY CROSS-LINKED ALGINATE GELS - INFLUENCE OF IONIC SOLUTES AND NONPOLAR-SOLVENTS %V 26 %X The equilibrium swelling volume of covalently crosslinked sodium alginate (a highly ionized stiff polymer network) gels has been studied as a function of electrolyte concentration, pH, and concentration of salts in ethanol-water mixtures. It is shown by numerical analysis of the Flory theory for swelling of gels that the ionic contribution to swelling seems to be the main determining factor for the swelling of these gels. Volume changes in aqueous solutions may be explained mainly by the ionic contribution to swelling. Reduced swelling and marked hysteresis are observed when the gels are exposed to low pH or cations that induce gelling in soluble Na-alginate. In contrast to predictions found in the literature, no discrete volume changes have been observed as a result of altering solvent composition. This discrepancy is attributed to the effect of the Donnan equilibrium and the high stiffness of the alginate chains. The gel volume changes in ethanol-water mixtures resemble the solubility of uncrosslinked alginates.

@article{MOE1993, __markedentry = {[phpts:6]}, abstract = {The equilibrium swelling volume of covalently crosslinked sodium alginate (a highly ionized stiff polymer network) gels has been studied as a function of electrolyte concentration, pH, and concentration of salts in ethanol-water mixtures. It is shown by numerical analysis of the Flory theory for swelling of gels that the ionic contribution to swelling seems to be the main determining factor for the swelling of these gels. Volume changes in aqueous solutions may be explained mainly by the ionic contribution to swelling. Reduced swelling and marked hysteresis are observed when the gels are exposed to low pH or cations that induce gelling in soluble Na-alginate. In contrast to predictions found in the literature, no discrete volume changes have been observed as a result of altering solvent composition. This discrepancy is attributed to the effect of the Donnan equilibrium and the high stiffness of the alginate chains. The gel volume changes in ethanol-water mixtures resemble the solubility of uncrosslinked alginates.}, added-at = {2011-11-04T13:47:04.000+0100}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036}, author = {MOE, S. T. and SKJAKBRAEK, G. and ELGSAETER, A. and SMIDSROD, O.}, authoraddress = {UNIV TRONDHEIM,NORWEGIAN INST TECHNOL,DEPT PHYS,N-7034 TRONDHEIM,NORWAY.}, biburl = {https://www.bibsonomy.org/bibtex/207afc1cde00dbd800e33656092844844/pawelsikorski}, citedref = {GEL FILTRATION THEOR ; ION EXCHANGE CHROMAT ; 1961, 865265, GB ; BUCHNER PB, 1961, J CHEM SOC, P3974 ; CANTOR CR, 1980, BIOPHYSICAL CHEM, V3 ; CLARK AH, 1983, MACROMOLECULES, V16, P1367 ; DREYFUS H, 1921, 166767, GB ; DUSEK K, 1968, J POLYM SCI A2, V6, P1209 ; FLODIN P, 1962, THESIS UUPPSALA U ; FLORY PJ, 1953, PRINCIPLES POLYM CHE ; GOOSEN MFA, 1985, BIOTECHNOL BIOENG, V27, P146 ; GRANT GT, 1973, FEBS LETT, V32, P195 ; GRASDALEN H, 1983, CARBOHYD RES, V118, P255 ; HAMERSTRAND GE, 1960, CEREAL CHEM, V37, P519 ; HAUG A, 1964, THESIS U TRONDHEIM ; HIROKAWA Y, 1984, J CHEM PHYS, V81, P6379 ; HIROTSU S, 1987, J CHEM PHYS, V87, P1392 ; HOLMBERG L, 1983, THESIS SWEDISH U AGR ; ILAVSKY M, 1981, POLYMER, V22, P1687 ; ILMAIN F, 1991, NATURE, V349, P400 ; KARTHA KPR, 1985, STARCH, V37, P270 ; KARTHA KPR, 1985, STARCH-STARKE, V37, P297 ; KUNIAK L, 1972, STARKE, V24, P110 ; MANNING GS, 1978, Q REV BIOPHYS, V11, P179 ; MARCHETTI M, 1990, MACROMOLECULES, V23, P1760 ; MARCHETTI M, 1990, MACROMOLECULES, V23, P3445 ; MARTINSEN A, 1989, BIOTECHNOL BIOENG, V33, P79 ; MOE ST, IN PRESS CARBOHYDR P ; MOE ST, IN PRESS FOOD POLYSA ; MOE ST, 1991, FOOD HYDROCOLLOID, V5, P119 ; MOE ST, 1992, CARBOHYD POLYM, V19, P279 ; OHMINE I, 1982, J CHEM PHYS, V77, P5725 ; PAINTER TJ, 1983, POLYSACCHARIDES, V2, P195 ; PORATH J, 1971, J CHROMATOGR, V60, P167 ; SJAKBRAEK G, 1989, BIOMEDICAL BIOTECHNO, P385 ; SKJAKBRAEK G, 1989, CARBOHYD POLYM, V10, P31 ; SKJAKBRAEK G, 1989, CARBOHYD RES, V185, P131 ; SKJAKBRAEK G, 1991, SEAWEED RESOURCES EU, P219 ; SKJAKBRAEK G, 1992, 5144016, US ; SMIDSROD O, 1967, J POLYM SCI, V16, P1587 ; SMIDSROD O, 1970, CARBOHYD RES, V13, P359 ; TANAKA T, 1978, PHYS REV LETT, V40, P820 ; TANAKA T, 1979, J CHEM PHYS, V70, P1214 ; TANAKA T, 1979, POLYMER, V20, P1404 ; TANAKA T, 1980, PHYS REV LETT, V45, P1636 ; TANAKA T, 1981, SCI AM, V244, P1110 ; TANAKA T, 1987, NATO ASI SERIES E, V133, P1 ; TANAKA T, 1987, NATURE, V325, P796 ; TANFORD C, 1961, PHYSICAL CHEM MACROM}, interhash = {ac43192da1d167395b46d37a8fcdef13}, intrahash = {07afc1cde00dbd800e33656092844844}, isifile-dt = {Article}, isifile-ga = {LL417}, isifile-j9 = {MACROMOLECULES}, isifile-nr = {49}, isifile-pi = {WASHINGTON}, isifile-rp = {MOE, ST, UNIV TRONDHEIM,NORWEGIAN INST TECHNOL,DEPT ; BIOTECHNOL,NORWEGIAN BIOPOLYMER LAB,N-7034 TRONDHEIM,NORWAY.}, isifile-sc = {Polymer Science}, isifile-tc = {27}, issn = {0024-9297}, journal = {Macromolecules}, keywords = {;; [ISI:] agar changes; gels; phase-transition; predictions; starch; temperature-sensitive thermodynamic volume}, language = {English}, month = {JUL 5}, number = 14, owner = {phpts}, pages = {3589 -- 3597}, publisher = {AMER CHEMICAL SOC}, size = {9 p.}, sourceid = {ISI:A1993LL41700017}, timestamp = {2011-11-04T13:47:18.000+0100}, title = {SWELLING OF COVALENTLY CROSS-LINKED ALGINATE GELS - INFLUENCE OF IONIC SOLUTES AND NONPOLAR-SOLVENTS}, volume = 26, year = 1993 }