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Developing Electrospun Ethylcellulose Nanofibrous Webs: An Alternative Approach for Structuring Castor Oil.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Rheology

Background:

  • Developing sustainable, functional natural polymer gel-like dispersions in oil is crucial for various applications.
  • Ethylcellulose (EC) is a promising natural polymer for creating such dispersions.
  • Traditional methods for oleogel formation often involve high temperatures, limiting their applicability.

Purpose of the Study:

  • To investigate the manufacture of electrospun ethylcellulose (EC) nanofibrous webs.
  • To evaluate the potential of these EC nanofiber webs for thickening vegetable oils.
  • To understand the influence of EC properties and solvent systems on electrospinning and final dispersion characteristics.

Main Methods:

  • Electrospinning of ethylcellulose (EC) solutions in binary solvent systems.
  • Characterization of EC nanofiber morphology and diameter.
  • Rheological analysis of EC nanofiber dispersions in castor oil.
  • Comparison with EC oleogels produced via thermogelation.

Main Results:

  • Defect-free EC nanofibers were produced above a critical concentration (approx. 2.5 times the entanglement concentration, Ce).
  • Fiber diameter increased with EC molecular weight (Mw) and concentration.
  • Solvent system properties (dielectric constant, dipole moment) affected nanofiber web morphology.
  • Nanofiber morphology significantly influenced the physical stabilization and rheological behavior (storage modulus, G') of the dispersions.
  • Electrospun EC dispersions exhibited comparable or superior thermorheological and tribological properties to traditional EC oleogels.

Conclusions:

  • Electrospinning provides an efficient method to create EC nanofiber webs for thickening vegetable oils.
  • The study demonstrates a novel, eco-friendly approach to producing bio-based oleogel-like dispersions.
  • These EC nanofiber dispersions show significant potential for applications in pharmaceuticals, food, and lubricants.