Foaming Behavior of Dialdehyde Starch Schiff-base Derivatives

Abstract

Abstract A foamable dialdehyde starch-aniline Schiff-base (DAS-AN) was synthesized by the reaction of dialdehyde starch (DAS) and oil-soluble aniline in a homogeneous dimethyl sulfoxide system under N2 atmosphere. The DAS-ANs were characterized by gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FT-IR) and NMR spectroscopy. Their foaming behavior and surface tension were investigated. Foaming power and stability tests were performed for solutions of DAS-ANs with different degrees of substitutions with aniline (DS AN) and concentrations. The maximum foaming power was 2.6 times the initial solution volume of the foam test in 450 mg · L–1 CaCO3 aqueous solution. The most stable foams only decreased by 6% in volume in deionized water after 20 min.