Abstract

Ethoxy- and aminoderivatives of natural polymers, humic acids, have been obtained via mechanochemical synthesis in a vibrational apparatus. The structure and physicochemical properties of their macromolecules have been studied by IR and UV spectroscopies. The average molecular mass of the products has been determined. The pendant drop shape and oscillating pendant drop methods have been employed to study the tensiometric and dilatational rheological characteristics of the surface layers formed at the interfaces between air and solutions of the modified derivatives of humic acids. It has been found that the formation of the adsorption layers of humic acid salts agrees with the protein adsorption model, which takes into account the possible existence of n states of macromolecules and their ability to aggregation in the surface layers when using the relations of the model in a semiempirical form. It has been shown that the viscoelasticity moduli of the surface layers of the ethoxylated derivatives of humic acids are increased relative to that of their unmodified form. Aminoderivatives of humic acids exhibit a higher stability in an acidic medium due to the presence of amino groups.

中文翻译：

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液-气界面上腐殖酸的机械化学改性产物形成吸附层的特殊特征

摘要

天然聚合物的腐殖酸的乙氧基和氨基衍生物是通过振动设备中的机械化学合成获得的。它们的大分子的结构和理化性质已经通过红外和紫外光谱学研究。已经确定了产物的平均分子量。悬滴形状和振荡悬滴方法已被用于研究在空气和腐殖酸的改性衍生物的溶液之间的界面处形成的表面层的张力和膨胀流变特性。已经发现，腐殖酸盐的吸附层的形成与蛋白质吸附模型相符，该模型考虑了可能存在n当以半经验形式使用模型的关系时，大分子的状态及其在表层中聚集的能力。已经表明，腐殖酸的乙氧基化衍生物的表面层的粘弹性模量相对于未改性形式的粘弹性模量增加。由于存在氨基，腐殖酸的胺衍生物在酸性介质中显示出更高的稳定性。