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采用动态光散射技术、透射电镜等表征了接枝磺化碱木质素聚合物(SBAL)在不同pH条件下的溶液行为,结果表明随着pH的增加,SBAL分子中的亲水官能团磺酸基、羧基和酚羟基逐步解离,分子链由卷曲变得伸展.利用频率-耗散联用型石英晶体微天平和静电逐层自组装技术,借助紫外光谱、原子力显微镜等表征了不同pH条件下SBAL在固/液界面上的吸附特征,结果发现随着pH由3增加到12,SBAL在金片和石英玻片上的吸附量先减小后增大,pH=9时吸附量最小.随着pH的增加,SBAL的吸附特征由刚性变得柔软,吸附构型呈现由致密到松散再到致密的变化趋势,吸附构象在酸性、中性和碱性条件下依次为mushroom结构、pancake结构和高分子刷,在中性和酸性条件下SBAL与聚二烯丙基二甲基氯化铵之间的作用力以阳离子-π相互作用为主,吸附强度较弱,而在强碱条件下以静电作用为主,吸附强度较大.
The solution behavior of SBAL at different pHs was characterized by dynamic light scattering and transmission electron microscopy. The results showed that with the increase of pH, the hydrophilic functional group sulfonic acid groups , The carboxyl group and the phenolic hydroxyl group are gradually dissociated and the molecular chain is extended by the curl.The frequency-dissipation combined quartz crystal microbalance and electrostatic layer-by-layer self-assembly technique were used to characterize the effects of different pH conditions SBAL adsorption at the solid / liquid interface and found that as the pH increased from 3 to 12, the amount of SBAL adsorbed on gold and quartz slides decreased first and then increased, with a minimum amount of adsorption at pH = 9. With The adsorption characteristics of SBAL changed from rigid to soft, and the adsorption configuration showed a tendency of densification to looseness and densification. The adsorption conformations were mushroom structure, pancake structure and high in acidic, neutral and alkaline conditions Molecular brush, under neutral and acidic conditions, the interaction between SBAL and polydiallyldimethylammonium chloride is dominated by cation-π interaction, and the adsorption strength is weak. Under the condition of strong alkali, The role of the main, greater adsorption strength.