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首页> 外文期刊>Journal of Applied Polymer Science >Properties of Polyelectrolyte-Modified Clays: Influence of the Particle Concentration on the Degree of Modification
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Properties of Polyelectrolyte-Modified Clays: Influence of the Particle Concentration on the Degree of Modification

机译：聚电解质改性粘土的性质：颗粒浓度对改性度的影响

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Adsorption of polycation as well as the modification with oppositely charged polyelectrolytes is a useful tool for surface modification. As shown previously, a strong enhancement of the attainable specific cationic surface charge was observed, e.g. with poly(diallyl-dimethylammonium chloride)(PDADMAC) as the polycation and poly(maleic acid-co-α-methylstyrene)(P(MS-α-MeSty) as the polyanion, at a ratio of anionic to cationic charges of n-+ = 0.6...0.7.However, because the surface charge seemed to be strongly affected by the conditions of modification, the influence of particle concentration was investigated in detail. One gram of clay was suspended in different volumes of water so that the particle concentration was varied from 1 to 100 g/L. These suspensions were treated under the same conditions. For characterizing the surface charge of clay polyelectrolyte titration, dye adsorption, or microelectrophoresis was used. The comparison between the results of polyelectrolyte titration and the carbon content in the residual solution allowed prediction of the existence of a polyelectrolyte complex and calculation of the stoichiometry. It was found for a constant concentration of PDADMAC per 1 g of clay that the surface charge of modified clays changed from negative (1 g/L) to strong positive, depending on the particle concentration. The cause was assumed to be the differences in the probability of interaction of particles, combined with the changes in the stoichiometry of the polyelectrolyte complex built in the solution, whereas the effect of other factors (conductivity, time of adsorption) was rather low. A strong cationic surface modification was obtained for medium and high particle concentrations only.
机译：聚阳离子的吸附以及带相反电荷的聚电解质的改性是用于表面改性的有用工具。如前所示，观察到了可达到的特定阳离子表面电荷的强烈增强，例如。以聚（二烯丙基-二甲基氯化铵）（PDADMAC）为聚阳离子和聚（马来酸-共-α-甲基苯乙烯）（P（MS-α-MeSty）为聚阴离子），阴离子与阳离子的电荷比为n- / n + = 0.6 ... 0.7。但是，由于表面电荷似乎受到改性条件的强烈影响，因此详细研究了颗粒浓度的影响，将一克粘土悬浮在不同体积的水中，这样颗粒浓度从1到100 g / L不等，在相同条件下处理这些悬浮液，以表征粘土聚电解质滴定，染料吸附或微电泳的表面电荷，将聚电解质滴定结果与碳进行比较。残留溶液中的含量可以预测聚电解质配合物的存在并计算化学计量，发现对于每1克粘土恒定浓度的PDADMAC，其表面电荷为细粒粘土从负离子（1 g / L）变为强正离子，具体取决于颗粒浓度。认为原因是颗粒相互作用的可能性不同，再加上溶液中内置的聚电解质复合物的化学计量变化，而其他因素（电导率，吸附时间）的影响却很小。仅在中等和高颗粒浓度下获得了强阳离子表面改性。

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