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Related Experiment Videos

Hydroxyapatite moldable formulation using natural rubber latex as binder.

G S Sailaja1, P Ramesh, H K Varma

  • 1Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojappura, Thiruvananthapuram 695012, India.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|December 22, 2006
PubMed
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A novel method uses natural rubber latex (NRL) to shape complex hydroxyapatite (HAP) bioceramics. This process yields dense HAP with improved mechanical properties and uniform microstructure, suitable for advanced applications.

Area of Science:

  • Materials Science
  • Bioceramics Engineering
  • Polymer Processing

Background:

  • Shaping intricate bioceramic green bodies presents processing challenges.
  • Natural rubber latex (NRL) offers potential as a binder for bioceramic composites.
  • Hydroxyapatite (HAP) is a key biomaterial for bone regeneration and dental applications.

Purpose of the Study:

  • To develop a simple and efficient method for shaping intricate bioceramic green bodies using NRL as a binder.
  • To investigate the effect of HAP content on the properties of HAP-NRL composites.
  • To evaluate the thermal behavior, microstructure, and mechanical performance of the sintered HAP bioceramics.

Main Methods:

  • Composite formulations of wet precipitated HAP, NRL, and a stabilizer were prepared.

Related Experiment Videos

  • Controlled heat treatment and sintering were employed to densify the HAP-NRL green bodies.
  • Characterization included thermal degradation analysis, energy-dispersive X-ray (EDX), inductively coupled plasma (ICP) analysis, scanning electron microscopy (SEM), flexural strength, flexural modulus, and Vickers microhardness testing.

    • Main Results:

    • Dense HAP shapes were successfully obtained through controlled heat treatment and sintering.
    • NRL exhibited slow thermal degradation without abrupt exotherm, and its inorganic residue was free of heavy elements.
    • Sintered density increased with HAP content, while shrinkage decreased.
    • Compositions with 85-95 wt% HAP demonstrated enhanced flexural strength (40-54 MPa) and flexural modulus (36-50 GPa).
    • SEM analysis confirmed microstructural uniformity increased with HAP content.
    • Vickers microhardness increased with sintering temperature, reaching a maximum at the highest HAP loading.

    Conclusions:

    • Natural rubber latex is an effective binder for processing intricate bioceramic green bodies.
    • The developed method allows for the fabrication of dense HAP bioceramics with tailored mechanical properties.
    • Optimizing HAP content and sintering temperature leads to superior flexural strength, modulus, and microhardness in the sintered HAP bioceramics.