Interaction of binders with dispersant stabilised alumina suspensions
Interaction of binders with dispersant stabilised alumina suspensions
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DOI：
10.1016/s0927-7757(99)00374-x
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发表时间：
2000-01-30
影响因子：
5.2
通讯作者：
Luckham, PF
中科院分区：
文献类型：
--
作者：
Khan, AU;Briscoe, BJ;Luckham, PF
本研究描述了用聚电解质或有机多价盐分散剂稳定并包括聚乙烯醇（PVA）作为粘合剂的选定水性氧化铝悬浮液的流变反应。高分子分散剂由聚甲基丙烯酸酯的铵盐组成，有机多价化合物为芳香硫酸盐的钠盐。结果表明，在不含任何分散剂的情况下，PVA的加入对体系的流变性没有显著影响。然而，在分散剂的存在下，流变性受到很大影响。在一定分散剂浓度下，随着PVA浓度的增加，分散剂的粘度、储存量和损失模量均增加。此外，对于给定浓度的PVA，可以观察到粘度、储存和损失模值随着分散剂浓度的增加而增加。有人认为，在低PVA浓度下，未吸附分散剂的过量浓度会通过减少排斥静电（双层）效应导致悬浮液中颗粒的絮凝。相反，当PVA浓度较高时，悬浮液的絮凝作用通过耗竭机制得到促进。(C) 2000 Elsevier Science B.V.版权所有
The rheological response of selected aqueous alumina suspensions, stabilised with a polyelectrolyte or with an organic polyvalent salt dispersant, and including poly(vinyl) alcohol (PVA) as a binder, are described in this study. The polymer dispersant was composed of an ammonium salt of poly(methacrylate) and the organic polyvalent compound was a sodium salt of an aromatic sulphate. The results show that the addition of PVA, without any included dispersant does not significantly influence the rheology of the system. However, in the presence of a dispersant the rheology is greatly affected. At a given concentration of the dispersant, the viscosity, storage and loss moduli all increase, as the PVA concentration is increased. Also, for a given concentration of the PVA, it is observed that the viscosity, storage and loss moduli values increase as the concentration of the dispersant is increased. It is argued that at low PVA concentrations, an excess concentration of the unadsorbed dispersant causes flocculation of the particles in the suspension by a reduction of the repulsive electrostatic (double layer) effect. In contrast, at higher concentrations of the PVA the flocculation of the suspension is promoted via a depletion mechanism. (C) 2000 Elsevier Science B.V. All rights reserved.