The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period,...The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period, acceleration period and steady period. The accelerative increase period ranged in 3～17 days determines the incremental amount of gelling velocity and gel viscosity, and its gelling kinetics equation is η=η 0+kt 0.9(25 ℃). There are two factors which are the doses of water soluble phenol formaldehyde resin as crosslinker and the molecular weight of APAM affecting the gelling velocity at temperature 40～70 ℃, the former is the more prominent. The gelling reaction rate constant k could be controlled in 1 57～3 13 Pa·s/d 0.9 for reaction of 0 4% APAM solution with 0 2%～0 8% resol as crosslinker at reaction temperature 50 ℃ and the gel viscosity being reached to the maximum values of 16 2～29 0 Pa·s.展开更多
In this paper the crosslinking reaction between partially hydrolyzed Polyacrylamide (HPAM) with ultrahigh molecular weight and chromium (Ⅲ) was investigated by atomic absorption method. The results showed that when t...In this paper the crosslinking reaction between partially hydrolyzed Polyacrylamide (HPAM) with ultrahigh molecular weight and chromium (Ⅲ) was investigated by atomic absorption method. The results showed that when the concentration of HPAM was fixed , the crosslinking density decreased with the increase of n (COO -)/ n . When the amount of Cr(Ⅲ) was fixed, the crosslinking density increased with the increase of n (COO -)/ n . When the initial pH value of HPAM/Cr(Ⅲ) system was between 4 and 8, the crosslinking density increased with the increase of pH value. The crosslinking density also increased with the increase of temperature and the increase of salinity.展开更多
Inverse suspension polymerization of acrylamide was carried out in benzene continuous phase using cellulose acetate as suspension stabilizer and ammonium persulfate as initiator.An ideal recipe was recommended for the...Inverse suspension polymerization of acrylamide was carried out in benzene continuous phase using cellulose acetate as suspension stabilizer and ammonium persulfate as initiator.An ideal recipe was recommended for the preparation of monodispersed polyacrylamide particles of 150—297μm in diameter and 1.5—4.0 nm in polymer network pore size through experiments.The effects of initial monomer concentration,stabilizer concentration,initiator concentration and agitation rate on the diameter and diameter distribution of polymer particles were systematically studied.展开更多
文摘The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period, acceleration period and steady period. The accelerative increase period ranged in 3～17 days determines the incremental amount of gelling velocity and gel viscosity, and its gelling kinetics equation is η=η 0+kt 0.9(25 ℃). There are two factors which are the doses of water soluble phenol formaldehyde resin as crosslinker and the molecular weight of APAM affecting the gelling velocity at temperature 40～70 ℃, the former is the more prominent. The gelling reaction rate constant k could be controlled in 1 57～3 13 Pa·s/d 0.9 for reaction of 0 4% APAM solution with 0 2%～0 8% resol as crosslinker at reaction temperature 50 ℃ and the gel viscosity being reached to the maximum values of 16 2～29 0 Pa·s.
文摘In this paper the crosslinking reaction between partially hydrolyzed Polyacrylamide (HPAM) with ultrahigh molecular weight and chromium (Ⅲ) was investigated by atomic absorption method. The results showed that when the concentration of HPAM was fixed , the crosslinking density decreased with the increase of n (COO -)/ n . When the amount of Cr(Ⅲ) was fixed, the crosslinking density increased with the increase of n (COO -)/ n . When the initial pH value of HPAM/Cr(Ⅲ) system was between 4 and 8, the crosslinking density increased with the increase of pH value. The crosslinking density also increased with the increase of temperature and the increase of salinity.
文摘Inverse suspension polymerization of acrylamide was carried out in benzene continuous phase using cellulose acetate as suspension stabilizer and ammonium persulfate as initiator.An ideal recipe was recommended for the preparation of monodispersed polyacrylamide particles of 150—297μm in diameter and 1.5—4.0 nm in polymer network pore size through experiments.The effects of initial monomer concentration,stabilizer concentration,initiator concentration and agitation rate on the diameter and diameter distribution of polymer particles were systematically studied.
