Effect of 12-Hydroxystearic Acid on the Structuration of Blends with a High Content of Renewable Raw Materials

Author(s): Marie-Caroline Agogue, Catherine Loisel, Abdellah Arhaliass, Olivier Gonçalves, Jack Legrand and Sylvaine Saint-Jalmes

The substitution of mineral waxes by renewable raw materials is possible by the use of organogel, via the incorporation of an organogelator, 12-hydroxystearic acid (12-HSA). However, the physico-chemical characteristics of renewable vegetable raw materials differ from those of mineral waxes. The aim of this research is to study the effect of 12-HSA content on the structuration of blends with a high content of renewable raw materials. For this purpose, 4 blends (made of 70% of organogel with different contents of 12-HSA) were compared to a reference blend (mainly composed of petrochemical paraffins). The impact of different concentrations of 12-HSA on the structure of blends, in particular on their microstructure was investigated. The structure was then analyzed at three scales: at the molecular scale, using the infrared spectra, at the microscopic scale, by polarized light microscopy to characterize the size distribution of the crystals, and at the overall scale by measuring the thermal behavior by differential scanning calorimetry.