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Selection of Solid-State Plasticizers as Processing Aids for Hot-Melt Extrusion.

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This study identifies effective solid-state plasticizers for hot-melt extrusion (HME) by evaluating physical and mechanical properties. Stearic acid, glyceryl behenate, and polyethylene glycol 8000 were confirmed as efficient processing aids for pharmaceutical formulations.

Keywords:
binary mixturesempirical modelhot-melt extrusionplasticization efficiencyprocessing aidrheologysolid-state plasticizerssolubility parametersternary mixturesthermal analysis

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Area of Science:

  • Pharmaceutical Science
  • Materials Science
  • Chemical Engineering

Background:

  • Hot-melt extrusion (HME) is a key pharmaceutical manufacturing process requiring optimized processing aids.
  • Selection of appropriate plasticizers is crucial for enhancing the processability and final product properties in HME.

Purpose of the Study:

  • To identify and evaluate solid-state plasticizers for the hot-melt extrusion (HME) process.
  • To assess the effectiveness of selected plasticizers as processing aids in binary and ternary systems.

Main Methods:

  • Utilized solubility parameters, thermal analysis (DSC, TGA), and rheological evaluation to assess plasticizer performance.
  • Investigated binary (polymer:plasticizer) and ternary (API:polymer:plasticizer) systems using Indomethacin and Eudragit® E PO as models.
  • Developed an empirical model correlating physical mixture rheology to HME process outcomes.

Main Results:

  • Stearic acid, glyceryl behenate, and polyethylene glycol 8000 were identified as suitable solid-state plasticizers based on solubility parameters.
  • Thermal and rheological assessments confirmed miscibility predictions and provided insights into plasticization efficiency.
  • The developed model successfully correlated rheological properties with HME process performance.

Conclusions:

  • Solid-state plasticizers like stearic acid, glyceryl behenate, and PEG 8000 can significantly improve HME processability.
  • Understanding the thermal and rheological behavior of mixtures is vital for selecting optimal plasticizers and processing conditions.
  • This study provides a framework for selecting solid plasticizers and optimizing HME processes for pharmaceutical applications.