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Complex Geometry Cellulose Hydrogels Using a Direct Casting Method.

Hossein Najaf Zadeh1,2, Tim Huber2,3, Volker Nock2,4

  • 1Department of Mechanical Engineering, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand.

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Summary
This summary is machine-generated.

This study shows that wax mould properties, including melting point and cellulose solution contact angle, directly impact cellulose hydrogel production efficiency. Faster mould removal is achieved with higher contact angles and lower melting point waxes.

Keywords:
cellulosehydrogelinvestment castingphysical cross-linkingwax mould

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Functional hydrogel part production is crucial for various applications.
  • The indirect wax mould method requires understanding material, process, and mould removal interactions.
  • Cellulose hydrogels offer unique properties but require specific fabrication techniques.

Purpose of the Study:

  • To investigate the relationships between wax mould properties, processing parameters, and cellulose hydrogel fabrication.
  • To evaluate the impact of thermophysical properties, wettability, and surface roughness of wax moulds on hydrogel casting.
  • To determine the optimal wax mould characteristics for efficient cellulose hydrogel production.

Main Methods:

  • Thermally forming and shaping cellulose gel in three distinct wax moulds: high melting point paraffin, sacrificial investment casting wax, and Solidscape® wax.
  • Utilizing physical cross-linking of cellulose solution in a NaOH/urea aqueous solvent.
  • Measuring and analyzing mould removal time based on mould melting point and cellulose solution contact angle.

Main Results:

  • All tested wax moulds successfully cast cellulose hydrogel objects.
  • Increasing temperature reduced cellulose gelling time, indicating a direct effect of mould melting temperature.
  • Mould removal time was significantly influenced by the contact angle and melting point of the wax mould, with higher contact angles and lower melting points facilitating faster removal.

Conclusions:

  • Wax mould selection and characteristics are critical factors in the efficient production of cellulose hydrogel parts.
  • Optimizing the contact angle and selecting lower melting point waxes can expedite the mould removal process.
  • This research provides valuable insights for advancing the indirect wax mould method for hydrogel fabrication.