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.
%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},
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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
}