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Study of petrolatum structure: Explaining its variable rheological behavior.

A J P van Heugten1, J Landman2, A V Petukhov3

  • 1Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, The Netherlands; Research and Development Department, Tiofarma B.V., Hermanus Boerhaavestraat 1, 3261 ME Oud-Beijerland, The Netherlands.

International Journal of Pharmaceutics
|February 17, 2018
PubMed
Summary
This summary is machine-generated.

Petrolatum

Keywords:
MicrostructureNanostructurePetrolatumRheologySynchrotron X-ray

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Area of Science:

  • Materials Science
  • Physical Chemistry

Background:

  • Petrolatum's rheological properties depend on temperature and thermal history.
  • Previous structural models of petrolatum, based on outdated microscopy, are insufficient.
  • The exact microstructural basis for petrolatum's thermal dependency remains unclear.

Purpose of the Study:

  • To investigate the microstructure of petrolatum.
  • To elucidate the relationship between microstructure, thermal history, and rheological properties.

Main Methods:

  • Rheometry
  • Differential Scanning Calorimetry (DSC)
  • Pulsed Nuclear Magnetic Resonance (NMR)
  • Polarized Light Microscopy (PLM)
  • Synchrotron X-ray diffraction

Main Results:

  • Petrolatum comprises 21% solid material at room temperature.
  • The solid phase consists of partly crystalline lamellar sheets organized in stacks.
  • Lamellar sheet occurrence is temperature-dependent, and stack number is influenced by thermal history.

Conclusions:

  • The number of lamellar stacks directly correlates with petrolatum's rigidity.
  • This microstructural insight explains the observed rheological differences in petrolatum.
  • The study provides a refined understanding of petrolatum's structure-property relationships.