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Water‐Soluble Grafted Starches for Hydration Suppression of Swellable Clay
Author(s) -
Zhang LiMing,
Chen DanQing
Publication year - 2002
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/1521-379x(200207)54:7<285::aid-star285>3.0.co;2-3
Subject(s) - swelling , grafting , acrylamide , methacrylate , starch , monomer , hydrolysis , polyacrylamide , copolymer , chemical engineering , polymer chemistry , polymer , chemistry , materials science , nuclear chemistry , organic chemistry , engineering
The study was undertaken to investigate the hydration suppression of swellable clay by water‐soluble graft terpolymers of potato starch with the mixed monomer system of acrylamide and 2‐(dimethylamino)ethyl methacrylate. It was found that the grafted starches investigated suppress the clay hydration‐swelling more effectively than a partially hydrolyzed polyacrylamide with a degree of hydrolysis of 16 %, a typical inhibitive polymer used in current drilling fluids. Besides, an increase in the grafting extent or concentration of the grafted starches results in enhanced hydration‐suppression efficiency. The starch graft terpolymer with a grafting extent of 120 %, applied at a concentration of 0.6 % (w/w) gives a suppression efficiency of 64.8 % toward the swelling of clay that had been hydrated for 24 h. The interaction of the terpolymer with the clay particles was discussed with the help of SEM observation.