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Silane Coupling Agents: Techno Brief

Coupling agents are adhesion promoters that are used to provide a stable bond by reducing the interfacial tension between the fibrous or particulate inorganic component and the organic matrix polymer in reinforced and filled plastics. This Coupling Agents guide is designed to help you understand more about the use of silanes as coupling agents in reinforced plastics, focusing on the benefits and main applications.

Silica Treatment for Shoe Soles

When used in shoe soles, silane coupling agents provide coupling of silica to the polymer backbone allowing for:

  • Improved abrasion resistance
  • Longer flexural life
  • Use of a white filler

The mechanism of behavior is much the same as in Silica-filler tire treads. The Alkoxysilyl portion reacts with the Silica and the organofunctional portion reacts into the rubber during vulcanization. The result is improved rubber-to-filler interaction.

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