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Abstract:A comparative study was conducted among a lab-made palm kernel acid N-methyl monoethanolamide (PNMEA) and two commercial counterparts derived from diethanolamine (PDEA) and monoethanolamine (PMEA) on their properties as thickeners and foam boosters. The effects of PNMEA, PDEA and PMEA on the properties (including the flow pattern, thixotropy, elastic modulus and viscous modulus, etc) of a model shower gel were studied, in which sodium laureth-3 sulfate was used as the key component of the formula. The experimental results show that the apparent viscosity of PNMEA itself is lower and less temperature sensitive than that of PDEA; the model shower gels thickened by the three alkanolamides are all pseudoplastic non-Newtonian fluids and their thixotropies are very weak, and they behave like viscous fluid and elastic fluid at lower and higher shear frequencies, respectively; the three alkanolamides have similar foam-boosting and foam-stabilizing properties for the model shower gel. The thickening effect of PNMEA is superior to that of PDEA and similar to that of PMEA, but the apparent viscosity of the model shower gel thickened by PNMEA is less temperature sensitive than by PMEA. Therefore PNMEA is overall the best thickener among the three alkanolamides. Based on the comprehensive evaluation of safety, thickening property and foam-stabilizing property, PNMEA has advantage over PDEA and PMEA to become the dominant member in alkanolamides.
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