阳离子对两亲聚合物乳状液稳定性的影响

Effect of Cations on the Stability of Amphiphilic Polymer Emulsion

选取了阴离子相同而阳离子不同的四种无机盐,从无机盐浓度对两亲聚合物(AP)乳状液出水率以及连续相粘度和流变性影响方面开展了研究。结果表明,阳离子对AP乳状液的影响与阳离子的浓度、电荷数和离子半径存在联系。二价金属阳离子对AP乳状液的稳定性的影响随盐浓度的增加,乳状液的稳定性呈现先逐渐上升然后又下降的趋势。一价金属阳离子对AP乳状液稳定性的影响随盐浓度的增加,乳状液稳定性呈现下降的趋势。含金属阳离子的乳状液,离子半径越大,体系的粘弹性就越高,体系越稳定。金属阳离子对乳状液稳定的破坏从大到小的顺序是Na^+、K^+、Mg^(2+)、Ca^(2+)。

Four kinds of inorganic salts with the same anions and different cations were selected, and the influence of inorganic salt concentration on the water separation rate of AP emulsion and the viscosity and rheology of continuous phase were studied. The results showed that the effect of cations on AP emulsions was related to cation concentration, charge number and ionic radius. The effect of divalent metal cations on the stability of AP emulsion was that with the increase of salt concentration, the stability of emulsion increased gradually and then decreased. The effect of monovalent metal cations on the stability of AP emulsions was that as the salt concentration increased, the stability of the emulsion decreased. The larger the ionic radius, the higher the viscoelasticity of the system, the more stable the emulsion containing metal cations. The destruction sequence of the metal cations on the stability of the emulsion was sodium, potassium, magnesium and calcium ions.