%0 Journal Article %1 STOKKE1995 %A STOKKE, B. T. %A ELGSAETER, A. %A SMIDSROD, O. %A CHRISTENSEN, B. E. %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB %D 1995 %I ELSEVIER SCI LTD %J Carbohydr. Polym. %K ;; [ISI:] acid chain; gelation; hydrolysis; polysaccharide scleroglucan; viscosity; xanthan; %N 1 %P 5 -- 11 %T CARBOXYLATION OF SCLEROGLUCAN FOR CONTROLLED CROSS-LINKING BY HEAVY-METAL IONS %V 27 %X Samples of carboxylated scleroglucan, sclerox, with a degree of carboxylation in the side-chains varying from 10 to 50% were made in order to investigate the potential of using carboxylation as a means to control subsequent gelation by heavy metal ions. The storage and loss moduli of aqueous solutions of sclerox samples as a function of time were determined at T = 20 degrees C and 30 degrees C after addition of trivalent chromium ions. The theological characterization showed a transition from a viscoelastic liquid to a gel with a characteristic time depending on the chromium concentration and the degree of carboxylation. For 20% carboxylation, the rate of change in the storage modulus could be controlled within nearly three orders of magnitude from 10(-3) to 1 Pa min(-1), using total chromium concentrations ranging from 0.3 to 6 mM. This rate was decreased by a factor of 2-5 by reducing the degree of carboxylation to 10%. The present study indicates that carboxylation of scleroglucan can be used to control the rate of gelation mediated by heavy metal ion complexation. This finding suggests that extension of the application range of this polysaccharide from an efficient viscosifer for polymer flooding to profile modification of high temperature oil reservoirs is attainable.

@article{STOKKE1995, __markedentry = {[phpts:6]}, abstract = {Samples of carboxylated scleroglucan, sclerox, with a degree of carboxylation in the side-chains varying from 10 to 50% were made in order to investigate the potential of using carboxylation as a means to control subsequent gelation by heavy metal ions. The storage and loss moduli of aqueous solutions of sclerox samples as a function of time were determined at T = 20 degrees C and 30 degrees C after addition of trivalent chromium ions. The theological characterization showed a transition from a viscoelastic liquid to a gel with a characteristic time depending on the chromium concentration and the degree of carboxylation. For 20% carboxylation, the rate of change in the storage modulus could be controlled within nearly three orders of magnitude from 10(-3) to 1 Pa min(-1), using total chromium concentrations ranging from 0.3 to 6 mM. This rate was decreased by a factor of 2-5 by reducing the degree of carboxylation to 10%. The present study indicates that carboxylation of scleroglucan can be used to control the rate of gelation mediated by heavy metal ion complexation. This finding suggests that extension of the application range of this polysaccharide from an efficient viscosifer for polymer flooding to profile modification of high temperature oil reservoirs is attainable.}, added-at = {2011-11-04T13:47:04.000+0100}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB}, author = {STOKKE, B. T. and ELGSAETER, A. and SMIDSROD, O. and CHRISTENSEN, B. E.}, authoraddress = {UNIV TRONDHEIM,NTH,DEPT BIOTECHNOL,N-7034 TRONDHEIM,NORWAY.}, biburl = {https://www.bibsonomy.org/bibtex/2a7f59855afda96a2ba779536122b366d/pawelsikorski}, citedref = {AHMED I, 1994, TRENDS POLYM SCI, V2, P92 ; BAES CF, 1976, HYDROLYSIS CATIONS ; CARRIERE CJ, 1985, MACROMOLECULES, V18, P2019 ; CHRISTENSEN BE, 1991, CARBOHYD RES, V214, P55 ; CHRISTENSEN BE, 1993, MACROMOLECULES, V26, P6111 ; CHRISTENSEN BE, 1994, CARBOHYD POLYM, V25, P25 ; CONWAY MW, 1983, J PET TECHNOL FEB, P315 ; CRESCENZI V, 1983, CARBOHYD POLYM, V3, P273 ; DAVISON P, 1982, SOC PET ENG J JUN, P353 ; DUBOIS M, 1956, ANAL CHEM, V28, P350 ; GAMINI A, 1984, CARBOHYD POLYM, V4, P461 ; HUBBARD S, 1986, 5TH SPE DOE S ENH OI, P447 ; KAPLAKCI B, 1990, 7TH SPE DOE S ENH OI, P603 ; LOCKHART TP, 1991, 1991 SPE INT S OILF, P13 ; LOCKHART TP, 1991, J APPL POLYM SCI, V43, P1527 ; LUND T, 1988, CARBOHYD POLYM, V8, P245 ; MENJIVAR JA, 1986, ADV CHEM, V213, P209 ; MORADIARAGHI A, 1988, WATER SOLUBLE POLYM, P299 ; MORRIS ER, 1981, TECHNIQUES CARBOHY B, V310, P1 ; NOLTE H, 1992, CARBOHYD POLYM, V18, P243 ; PRUDHOMME RK, 1983, SOC PET ENG J OCT, P804 ; SMIDSROD O, 1971, BIOPOLYMERS, V10, P1213 ; STOKKE BT, 1990, BIOPOLYMERS, V30, P1161 ; STOKKE BT, 1992, CARBOHYD POLYM, V17, P209 ; STUNZI H, 1989, INORG CHEM, V28, P66 ; TROLL M, 1988, MACROMOLECULES, V13, P436 ; TYLER JM, 1980, J ULTRASTRUCT RES, V7, P95 ; YANAKI T, 1981, POLYM J, V13, P1135}, interhash = {0486cd9ebf1732a23ab5ef0817d50c65}, intrahash = {a7f59855afda96a2ba779536122b366d}, isifile-dt = {Article}, isifile-ga = {RJ549}, isifile-j9 = {CARBOHYD POLYM}, isifile-nr = {28}, isifile-pi = {OXFORD}, isifile-rp = {STOKKE, BT, UNIV TRONDHEIM,NTH,DEPT PHYS,NORWEGIAN BIOPOLYMER ; LAB,N-7034 TRONDHEIM,NORWAY.}, isifile-sc = {Chemistry, Applied; Chemistry, Organic; Polymer Science}, isifile-tc = {8}, issn = {0144-8617}, journal = {Carbohydr. Polym.}, keywords = {;; [ISI:] acid chain; gelation; hydrolysis; polysaccharide scleroglucan; viscosity; xanthan;}, language = {English}, number = 1, owner = {phpts}, pages = {5 -- 11}, publisher = {ELSEVIER SCI LTD}, size = {7 p.}, sourceid = {ISI:A1995RJ54900002}, timestamp = {2011-11-04T13:47:24.000+0100}, title = {CARBOXYLATION OF SCLEROGLUCAN FOR CONTROLLED CROSS-LINKING BY HEAVY-METAL IONS}, volume = 27, year = 1995 }