Interaction between α-alumina surface and polyacrylic acid
Interaction between α-alumina surface and polyacrylic acid
复制标题
α-氧化铝表面与聚丙烯酸之间的相互作用
DOI：
10.2109/jcersj.100.7
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发表时间：
1992
影响因子：
1.1
通讯作者：
Y. Ishihara
中科院分区：
文献类型：
--
作者：
Y. Hirata;Junko Kamikakimoto;A. Nishimoto;Y. Ishihara
研究了在pH值为2.2 ~ 10.5的水悬浮液中，α-氧化铝表面的性质、聚丙烯酸的解离部分以及氧化铝表面与聚丙烯酸之间的相互作用。胶体α-氧化铝颗粒的等电点为pH 7.7，在pH低于和高于7.7时，其表面分别带正电荷和负电荷。聚丙烯酸的解离部分随pH而变化，在pH低于3时接近0%，在pH高于9时接近100%。聚丙烯酸在低pH时以中性聚合物的形式吸附在氧化铝颗粒上，在高pH时以带负电荷的聚合物的形式吸附在氧化铝颗粒上，由于负电荷聚合物与氧化铝颗粒表面的排斥作用，吸附量随pH的升高而减少。
Properties of α-alumina surface, dissociated fraction of polyacrylic acid, and the interaction between alumina surface and polyacrylic acid were investigated in aqueous suspensions in the pH range of 2.2 to 10.5. The isoelectric point of the colloidal α-alumina particles was pH 7.7, and the surface was charged positively and negatively at pH below and above 7.7, respectively. The dissociated fraction of polyacrylic acid changed with pH, close to 0% at pH below 3 and 100% at pH above 9. Polyacrylic acid was adsorbed on the alumina particles as neutral polymer at low pH and negatively charged polymer at high pH. The total amout of adsorbed polymer decreased with an increase in pH due to the repulsive interaction between the negative particle surface and negatively charged polymer.