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Related Experiment Videos

Influence of selected components on crosslink density in polymer structures.

E Asmussen1, A Peutzfeldt

  • 1Department of Dental Materials, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark. ea@odont.ku.dk

European Journal of Oral Sciences
|September 4, 2001
PubMed
Summary

Varying methacrylate resin composition impacts crosslink density. Adding monofunctional monomers decreases crosslinking, while specific photoinitiator ratios affect polymer stability and hardness.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Bifunctional methacrylates form crosslinked polymers.
  • Crosslink density is a key polymer property.
  • Understanding composition effects is crucial for material design.

Purpose of the Study:

  • Investigate how varying resin composition affects crosslink density in model methacrylate polymers.
  • Test hypotheses regarding monofunctional monomer addition and polymer growth centers.
  • Analyze the relationship between composition, remaining double bonds, and crosslink density.

Main Methods:

  • Polymerized unfilled resins with varying BisGMA, TEGDMA, monofunctional monomer, camphoroquinone, and amine content using visible light.
  • Measured remaining double bonds and Wallace hardness post-polymerization.

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  • Assessed crosslink density by polymer softening after ethanol storage.

    • Main Results:

    • A minimum in hardness was observed with increasing monofunctional monomer content.
    • Higher camphoroquinone to amine ratios reduced ethanol softening at equivalent remaining double bonds.
    • Composition significantly influenced both remaining double bonds and crosslink density.

    Conclusions:

    • Resin composition is a critical factor in determining the crosslink density of methacrylate polymers.
    • Monofunctional monomers and photoinitiator ratios can be used to tune polymer network properties.
    • These findings aid in designing methacrylate-based materials with tailored physical characteristics.