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Preparation investigated. free systems"of the latices containing Either acrylamide(AA) or with styrene monomer as amide groups with high anionic surface charge was methacrylamide(MAA) was copolymerized in "soap a seed component, using potassium peroxodisulfate and sodium thiosulfate mixture as an initiator. The diameter of the paticles was adjusted from 0.2μm to 0.6μm by varying the adding time of amide from O.5 h to 3 h. The particles containing AA were spherical and well monodispersed, whereas those containing MAA were deformed ones. Carboxyl groups were introduced into their latices by hydrolysis of the amide groups with various amounts of alkali agents. The highest surface charge (e. g. Q1=230 peq/g-L, for L-3) amounted to over ten times greater than that of unhydrolysed ones (e. g. Q1 =19.0, ueq/g-L, for L-u). Using these highly charged anionic latices as model suspensions, the effects of cationic polymer on their flocculation and adsorption behavior have been studied. The destabilization was accomplished with irreversible adsorption due to the electrostatic attraction between the negative charge of the particles and the cationic segments of the added polymer. The saturated amounts of adsorption ((Qa )1 ) in cationic polymer-latex system depended on the amounts of the surface char ge (Q1) of respective latex particles. Further, each maximum destabilization of the latices (optimum polymer concentration, Qo.c ) was produced near the end point for charge neutralization of the particle with a cationic polymer. With increasing the adsorption of cationic polymer, zeta-potentials of the particles reduced gradually, passing through zero and then reversing in their signs (about +30 mV in all cases). From these results, it was found that the destabilization in those systems was due to the charge neutralization and the reversed surface charge of the particles. Furthermore, it was also found that the flocculation and the destabilized region depended on the conformations of adsorbed polymer chains.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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