Dispersion of Al2O3 suspension with acrylic copolymers bearing carboxylic groups
Dispersion of Al2O3 suspension with acrylic copolymers bearing carboxylic groups
复制标题
含羧基丙烯酸共聚物的 Al2O3 悬浮液分散体
DOI：
10.1016/s0927-7757(02)00327-8
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Baumard
中科院分区：
文献类型：
--
作者：
M. Romdhane;S. Boufi;S. Baklouti;T. Chartier;J. Baumard
研究了含羧基丙烯酸共聚物与水中氧化铝粉末表面的相互作用。吸附等温线的趋势表明，根据Langmuir模型，形成了一个单层。当聚合物上羧基的比例降低时，平台上的吸收量增加。分析了氧化铝悬浮液的电动力学性质。结果表明，共聚物吸附导致IEP向酸性pH偏移。此外，在pH 8-9时，氧化铝颗粒表面的电荷密度取决于吸附羧基的数量和被吸附聚合物的构型。通过粒径分布和加入不同数量共聚物后的流变性能来考察分散体的稳定性。丙烯酸共聚物稳定氧化铝悬浮液的能力受大分子链中羧基含量的影响很大。
The interaction between acrylic copolymers carrying carboxylic groups and the surface of an alumina powder in water has been studied. The trends of the adsorption isotherms suggest the formation of a monolayer according to the Langmuir model. The quantity absorbed on the plateau increases when the fraction of carboxylic groups on the polymer decreases. The electrokinetic properties of the alumina suspensions were also analysed. Results indicate that the copolymer adsorption leads to a shift in the IEP towards acidic pH. Moreover, the density of charge of the surface of alumina particle at pH 8–9 was found to depend on the quantity of adsorbed carboxylic groups and on the configuration of the adsorbed polymer. The stability of dispersions was investigated through particle size distribution and rheological properties after addition of various amounts of copolymers. The ability of the acrylic copolymer to stabilise alumina suspensions was found to be greatly affected by the content of carboxylic groups contained in the macromolecular chain.