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פותח על ידי קלירמאש פתרונות בע"מ -
Anionic polyacrylamide polymers effect on rheological behavior of sodium-montmorillonite suspensions
Year:
2002
Authors :
הלר, חנה
;
.
קרן, רמי
;
.
Volume :
66
Co-Authors:
Heller, H., Inst. of Soil, Water and Envtl. Sci., Volcani Center, Agriculture Res. Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel
Keren, R., Inst. of Soil, Water and Envtl. Sci., Volcani Center, Agriculture Res. Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
19
To page:
25
(
Total pages:
7
)
Abstract:
Polyacrylamide (PAM) is a long-chain synthetic polymer that acts as a strengthening agent, binding clay particles together. The interaction between anionic PAM and clay particles is not well understood yet. This interaction was evaluated by rheological measurements for Na-montmorillonite suspensions. Three anionic PAMs of three molecular weights (MWs) (3.5 × 103, 2 × 105, and 8 × 106 g mol-1) at similar hydrolysis levels (>85%) and three anionic PAMs at various degrees of hydorlysis (DH) (15, 33, and 92%) of similar MW were studied. In an electrolyte-free clay suspension at DH >85%, only the polymers with high MWs (2 × 105, and 8 × 106) could form a three-dimensional structure of clay platelets. The smallest polymer molecule size (3.5 × 103) was too short for bonding two adjacent platelets. At similar MW, the effect of the polymers increased with DH. At NaCl concentration of 10 mmolc, L-1, at which the attractive forces between clay platelets were weak, the polymers had a significant impact on flow behavior. The effectiveness of the polymers increased with increasing MW and DH. At NaCl concentration of 100 mmolc L-1, the three polymers of DH > 85% stabilized flocs that already existed in the clay suspension. The effectiveness of the polymers in bridging adjacent clay flocs increased as their DH decreased. The polymer conformation factor has a greater impact on clay structure stabilization in suspension than the electrostatic repulsion effect. The clay structure stability was increased with increasing polymer electrostatic negative charge for similar molecular weights.
Note:
Related Files :
Clay
Hydrolysis
Montmorillonite
Negative ions
Polyacrylamides (PAM)
Polyacrylates
polymer
rheology
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22928
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:55
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Scientific Publication
Anionic polyacrylamide polymers effect on rheological behavior of sodium-montmorillonite suspensions
66
Heller, H., Inst. of Soil, Water and Envtl. Sci., Volcani Center, Agriculture Res. Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel
Keren, R., Inst. of Soil, Water and Envtl. Sci., Volcani Center, Agriculture Res. Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel
Anionic polyacrylamide polymers effect on rheological behavior of sodium-montmorillonite suspensions
Polyacrylamide (PAM) is a long-chain synthetic polymer that acts as a strengthening agent, binding clay particles together. The interaction between anionic PAM and clay particles is not well understood yet. This interaction was evaluated by rheological measurements for Na-montmorillonite suspensions. Three anionic PAMs of three molecular weights (MWs) (3.5 × 103, 2 × 105, and 8 × 106 g mol-1) at similar hydrolysis levels (>85%) and three anionic PAMs at various degrees of hydorlysis (DH) (15, 33, and 92%) of similar MW were studied. In an electrolyte-free clay suspension at DH >85%, only the polymers with high MWs (2 × 105, and 8 × 106) could form a three-dimensional structure of clay platelets. The smallest polymer molecule size (3.5 × 103) was too short for bonding two adjacent platelets. At similar MW, the effect of the polymers increased with DH. At NaCl concentration of 10 mmolc, L-1, at which the attractive forces between clay platelets were weak, the polymers had a significant impact on flow behavior. The effectiveness of the polymers increased with increasing MW and DH. At NaCl concentration of 100 mmolc L-1, the three polymers of DH > 85% stabilized flocs that already existed in the clay suspension. The effectiveness of the polymers in bridging adjacent clay flocs increased as their DH decreased. The polymer conformation factor has a greater impact on clay structure stabilization in suspension than the electrostatic repulsion effect. The clay structure stability was increased with increasing polymer electrostatic negative charge for similar molecular weights.
Scientific Publication
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