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Related Experiment Videos

A novel processing method for injection-molded polyether-urethane scaffolds. Part 1: processing.

H Haugen1, J Will, W Fuchs

  • 1Central institute for medical engineering ZIMT, Technische Universität München, Boltzmannstrasse 11, D-85748 Garching bei München, Germany. h.j.haugen@odont.uio.no

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|October 22, 2005
PubMed
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A novel injection molding technique uses water and NaCl to create adjustable, open-cell polymer scaffolds without toxic organic solvents. This method allows precise control over pore size and porosity for advanced material applications.

Area of Science:

  • Biomaterials Engineering
  • Polymer Science
  • Materials Processing

Background:

  • Traditional scaffold fabrication methods often rely on organic solvents, posing risks of toxic residues.
  • Developing safe and scalable methods for producing porous polymer scaffolds is crucial for biomedical applications.

Purpose of the Study:

  • To develop a large-scale, safe scaffold processing method using injection molding.
  • To investigate the use of water and sodium chloride (NaCl) as foaming agent and porogen, respectively.
  • To control pore size and porosity through adjustable process parameters.

Main Methods:

  • Utilized injection molding with water as a foaming agent and NaCl as a porogen to create open-cell structures.
  • Avoided the use of common, potentially toxic organic solvents.

Related Experiment Videos

  • Conducted a parameter study varying injection pressure, plasticize speed, cylinder temperature, mold temperature, and NaCl concentration.

    • Main Results:

    • Successfully developed a large-scale scaffold processing method.
    • Achieved adjustable pore size and porosity by modifying process parameters.
    • Demonstrated that increased injection pressure, plasticize speed, cylinder, and mold temperature enhanced mean pore diameter.
    • Showcased that cylinder/mold temperature and NaCl concentration influenced porosity.
    • Produced scaffolds with 64 +/- 3% porosity, pore sizes from 30-450 microm, and a mean pore diameter of 270 +/- 90 microm.
    • Confirmed interconnective pore sizes ranging from 5 to 58 microm.

    Conclusions:

    • A safe and scalable injection molding technique for scaffold fabrication was successfully established.
    • The method effectively prevents toxic residues by using water and NaCl instead of organic solvents.
    • Precise control over scaffold architecture, including pore size and porosity, is achievable through process parameter optimization.