Abstract
Naturally derived non-ionic surfactants of poly(glycerol-succinate), PGS, Grafted PGS and PGS-sorbitan oligoester surfactants were synthesized and characterized by quantitative nuclear magnetic resonance (13C NMR), qualitative liquid chromatography–mass spectrometry (LC–MS) and fourier transfer infarred (FTIR). LC–MS is used to study the components in two different conditions, and the spectrum data in acidic condition reveals an average of three-four glycerol-succinate (GS) repeat units of PGS oligoester. Acidic condition (condition I) also reveals PGS-sorbitan oligoester with an average of three glycerol-succinate (GS) repeat units (calcd. mass 910 Da), while neutral condition (condition II) is revealed to distribute approximately evenly among short PGS branches and longest PGSs. Using LC in reverse-phase mode with two different mobile system, the PGS oligomers of the nonionic surfactant were observed the detailed characterisation of their compositions and structures in agreement with mathematic models from the data of quantitative 13C NMR. Their self-assembly in aqueous solution was studied using fluorescence spectroscopy and their foamability was evaluated. The critical aggregation concentration (CAC) ranged from 0.447 to 0.126 mM.
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