Adsorption of HPAM and other flexible coil polymers

2 Adsorption of HPAM and other flexible coil polymers 

Vela et al. (1974) studied the retention of an HPAM sample ( 20% hydrolysis 5.5 x 10 ) in Berea cores. They showed that both the 

Static adsorption levels of HPAM and AMPS onto silica flour (after Szabo, 1979, 

Lakatos and Lakatos-Szabo (1980) studied the dynamic retention of various HPAM samples in silica sandpacks. They found that the amount of retained polymer showed a small decrease with increasing average molecular mass. The decrease in retention level was more marked with increasing degree of hydrolysis of the HPAM sample. Dissolved inorganic salts were found to increase the levels of both hydrolysed and unhydrolysed polyacrylamide, but different salts acted to different extents. They propose that above a critical 

Lakatos et al. (1979) also studied the retention of HPAM in unconsolidated silica sand. The HPAM polymers used had a range of molecular weight of 0.7-4.8 X 10 and degree of hydrolysis of 0-40%. A silica sand of particle size 100-200 m and with a specific surface area between 0.1 (by mercury permeometry) and 0.18m /g (by krypton adsorption) was used to construct sandpacks 20cm long for all the polymer flow experiments. 

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