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[Unconverted double bonds and interface phenomena in composite materials].

K J Reinhardt1

  • 1Zentrum für Zahn-, Mund- und Kieferheilkunde, Münster.

Deutsche Zahnarztliche Zeitschrift
|March 1, 1991
PubMed
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Polymer composites often have unconverted double bonds, especially near the surface. Reducing these surface bonds significantly improves the material

Area of Science:

  • Polymer Science
  • Materials Science
  • Spectroscopy

Background:

  • Polymerized composites have unconverted double bonds at interfaces and contact surfaces.
  • Surface conversion analysis may not reflect bulk material quality.

Purpose of the Study:

  • To analyze unconverted double bonds in polymerized composites.
  • To correlate unconverted double bonds with discoloration susceptibility.

Main Methods:

  • Infrared spectroscopy was used to analyze polymerized composite samples.
  • Analysis focused on surface layers and deeper bulk material.

Main Results:

  • Surface layers (approx. 20 microns) showed 29%-48% unconverted double bonds.
  • Bulk material (>60 microns) had 18%-32% unconverted double bonds.

Related Experiment Videos

  • Composites with >35% unconverted double bonds were prone to discoloration.

    • Conclusions:

    • Composite conversion is primarily a surface phenomenon.
    • High surface unconverted double bonds correlate with poor color stability.
    • Removing affected surface layers enhances color stability.