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Related Experiment Videos

Controlling modulus and morphology of hydrogel tubes through surface modification.

Cristina Enescu1, Molly S Shoichet

  • 1Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, Canada M5S 3E5.

Journal of Biomaterials Science. Polymer Edition
|April 28, 2004
PubMed
Summary

Silane modification of glass molds improves the mechanical properties and surface morphology of poly(2-hydroxyethyl methacrylate-co-methyl methacrylate) hydrogel tubes. This process enhances tube strength and facilitates easier mold release for improved manufacturing.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Poly(2-hydroxyethyl methacrylate-co-methyl methacrylate) (PHEMA-MMA) hydrogel tubes are synthesized using centrifugal casting.
  • These tubes exhibit a biphasic wall structure: a spongy inner layer and a mechanically strong, gel-like outer layer.
  • The surface properties of the synthesis mold significantly influence hydrogel tube morphology and mechanical performance.

Purpose of the Study:

  • To investigate the impact of silane modifications on glass mold surfaces.
  • To evaluate the effect of these modifications on PHEMA-MMA hydrogel tube morphology, elastic modulus, and mold release.
  • To understand how surface hydrophobicity influences hydrogel tube properties.

Main Methods:

  • Centrifugal casting of PHEMA-MMA hydrogel tubes in glass molds.

Related Experiment Videos

  • Silane treatment of glass mold surfaces with ethoxy, amine, or fluorocarbon end-groups.
  • Characterization using X-ray photoelectron spectroscopy (XPS) and mechanical testing (elastic modulus).

    • Main Results:

    • Silane-modified glass molds exhibited increased hydrophobicity compared to unmodified molds.
    • Hydrogel tubes synthesized in silane-modified molds displayed a smooth outer morphology, unlike the cracked morphology in unmodified molds.
    • Tubes from silane-modified molds showed a significantly greater elastic modulus.
    • Ethoxy- and amine-functionalized silane modifications facilitated easier mold release.

    Conclusions:

    • Silane surface modification of glass molds is crucial for producing PHEMA-MMA hydrogel tubes with enhanced mechanical properties and desirable surface morphology.
    • Hydrophobicity of the mold surface plays a key role in determining the outer layer's integrity.
    • Optimized silane modifications can improve both the quality and manufacturability of PHEMA-MMA hydrogel tubes.