Physicochemical Properties of a Monoethanolamine-Modified Gossypol-Based Surfactant

This study investigates the physicochemical properties of a surfactant obtained by modification of gossypol resin with monoethanolamine. The modification was carried out in an alkaline medium at 70–80 °C. Surface tension, critical micelle concentration, foaming ability, and foam stability were determined using stalagmometric and Ross-Miles methods. The optimal conditions were found to be a monoethanolamine content of 20% and a reaction time of 4 hours. The modified surfactant reduced surface tension to 46–47 mN/m, produced a maximum foam volume of 178 cm³, and maintained foam stability of 70–75%. The critical micelle concentration was determined to be 1.0–1.2%. IR spectroscopic analysis revealed new absorption bands corresponding to C–N bonds in the 1200–1300 cm⁻¹ region. The results demonstrate the high surface-active and colloidal properties of the modified surfactant and indicate its potential application as a flotation reagent, emulsifier, and stabilizing agent for dispersed systems.

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