Novel Polyether Amide (ED2003-fa16) Macromolecular Surfactant:Synthesis, Characterization And Properties

Macromolecular surfactants have been widely used in industrial, biological, pharmaceutical, and cosmetic systems. Jeffamine polyetheramines for their nontoxicity, low cost and biodegradable have attracted more great attentions. Jeffamine are also particularly important in the production area, such as coating technologies, epoxy applications or mesoporous silica. But, for Jeffamine ED2003is rarely reported because of they don t be able to form micelles in aqueous solution which restrict their applications. According to the report of A. Pasc, for oligomers (such as Jeffamine ED900) the research found that the hydrophobic PPO units and the long alkyl chains can reduce the curving energy and result in a folding of the EO units to form micelles. Therefore, a series of novel polyether amide macromolecular surfactant (ED2003-fa-n) was synthesized from a polyetheramine (Jeffamine ED2003) modified by grafting fatty acids in order to force the folding of the PEO moiety to form micelles. The main results are as follows:1. A novel family of polyether amide macromolecular surfactants (ED2003-fa-n) were synthesized through Jeffamine ED2003and various fatty acids (caprylic, lauric, palmitic acid). The product is a brown waxy solid or syrup at RT. We take palmitic acid as an example, the reaction process was investigated by the orthogonal experiment and the optimization of reaction conditions. The optimum conditions of the ED2003-fa-n were obtained as follows: reaction temperature is195℃, reaction time is7h, reaction mole is ratio n(ED2003):n (RCOOH)=1:2.1.2. The structure and purity of the product was characterized and analyzed by IR,’H-NMR, UV, TGA and elemental analysis. The results showed that the theoretical values and the measured values were corresponded, which confirm the proposed structure. And the purity of product is very high.3. Investigate systematically the properties of ED2003-fa-n aqueous solution system, including the micelle formation behavior, HLB, cloud point (CP), foam properties, emulsifying properties, solubilization and fluorescence. In aqueous solution, these obtained ED2003-fa-n can self-assemble into stable micelles. The Critical Micelle Concentration (CMC) of ED2003-fa-n were determined through the method of surface tensions, the method of UV spectra without probe, and the results were similar. By the calculation, the HLB values of ED2003-fa-n are greater than13.The CP of ED2003-fa-n aqueous solution at different concentrations, PH and ionic strength were investigated. ED2003-fa-n surfactants have very good foam properties, emulsifying properties and fluorescence. And ED2003-fa-n has very good solubilization for hydrophobic dye fluorescent yellow in aqueous solution. In addition, the formation mechanism of ED2003-fa-n micelles is inferred by measuring fluorescence of ED2003-fa-16.