RHEOLOGICAL CHARACTERISTICS OF PETROLEUM JELLY FORMULATIONS CONTAINING ORGANICALLY MODIFIED .......

The rheological properties of stearic acid modified layered double hydroxides (OLDH) as a viscosity modifier and stabiliser in petroleum jelly (PJ) compositions were investigated. Stearic acid, an anionic surfactant commonly utilised in topical preparations, was employed to organically modify Mg-Al-LDH. XRD, FTIR, SEM, and TGA studies verified the successful integration of stearate anion into LDH interlayers. Using a high shear mixer, PJ formulations with varied OLDH levels (0.5, 1, 1.5, and 2 wt. percent) were created. The addition of OLDH raised the viscosity of the PJ formulations greatly, which can be explained by the strong contact between OLDH particles and the PJ hydrocarbon chains. The percolation threshold was found to be 1.5 weight percent of OLDH loading, indicating that the filler and polymer matrix have a well-developed interface. The creation of a gel-like structure was indicated by the non-Newtonian shear thinning. In an OLDH-based system, dynamic state rheological data of PJ formulations revealed a preponderance of elastic property given by solid phase. As a result, OLDH showed tremendous promise as a structural element in cosmetic formulations, providing viscosity enhancement as well as shear thinning behaviour, potentially resulting in formulation stability, improved skin feel, and spreadability.

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