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Summary

This study enhanced ultra-high-molecular-weight polyethylene (UHMWPE) composites with hydroxyapatite (HAp) and rosemary extract (RM). These additives significantly improved material stability and oxidation resistance for long-term applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Ultra-high-molecular-weight polyethylene (UHMWPE) is crucial for long-term applications.
  • Enhancing UHMWPE stability and resistance to degradation is essential for extending its service life.

Purpose of the Study:

  • To investigate the long-term application potential of UHMWPE matrices blended with low-density polyethylene (LDPE), hydroxyapatite (HAp), and rosemary extract (RM).
  • To analyze the impact of HAp and RM on the mechanical properties, oxidation strength, thermal behavior, crystallinity, and wettability of UHMWPE composites.

Main Methods:

  • Preparation of UHMWPE/LDPE blends incorporating HAp filler and RM stabilizer.
  • Characterization of material properties including mechanical testing, oxidation resistance assessment, thermal analysis, crystallinity measurements, and wettability studies.
  • Microstructural analysis using Scanning Electron Microscopy (SEM).
  • Accelerated oxidative degradation testing using gamma irradiation (50 kGy).

Main Results:

  • The addition of HAp and RM significantly increased the total degradation period by 67% compared to unmodified blends under gamma irradiation.
  • Activation energies for oxidation increased from 121 kJ mol⁻¹ to 139 kJ mol⁻¹ with HAp and RM, indicating delayed oxidation.
  • Enhanced thermal and oxidation resistances were observed in composites containing rosemary extract and HAp powder.
  • SEM analysis revealed microstructural changes influenced by the blend components.

Conclusions:

  • Rosemary extract and HAp are effective stabilizers for UHMWPE, significantly improving its resistance to oxidative degradation.
  • The developed UHMWPE composites demonstrate promising potential for long-term applications requiring enhanced durability and stability.
  • Gamma irradiation serves as an effective method for accelerated oxidative degradation studies.