Encyclopedia

  • 25 - Dispersants and Coupling Agents
  • Add time:08/24/2019         Source:sciencedirect.com

    Publisher SummaryAdditives play an important role in the proliferation of plastics. Dispersants and coupling agents are also additives which, even when used in low concentrations, can have a profound effect on the performance and viability of plastic materials in diverse applications from packaging to consumer appliances, electronics, automotive, and aerospace. They are powerful tools for tuning composites to give improved processability, and mechanical and aesthetic properties. Dispersants and coupling agents provide different advantages and are selected based upon the needs of the application in question. A general overview of the structure and basic principles are provided in the chapter. Several practical use considerations and their advantageous results are also discussed. The differences in the effects due to dispersion and to coupling arise from the nature of the inclusion interphase that is present. In the case of dispersion, this interphase is relatively weak and easily destroyed by strain or by the ingress of water. In the case of coupling, the interphase is much more resistant.

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