STP1545

    The Mechanism of Adhesion Improvement of Elastomeric Silicone Sealants to Difficult-to-Bond Polymeric Substrates through Reactive or Interpenetrating Molecular Brushes

    Published: Jul 2012


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    Abstract

    High-quality and durable adhesion of elastomeric adhesives to metallic, ceramic, and organic substrates is essential to a broad range of industries, e.g., building and construction, automotive, electronic, aerospace, biomedical, and others. The principles of engineering substrate surfaces through grafted connector molecules are discussed in this paper. In particular, two important modes of interaction for surface-grafted “molecular brushes” are investigated and experimentally verified. It is demonstrated that the inclusion of silicone- and/or amine-terminated graft molecules, such as silanes or polyethyleneimines, at polymer interfaces, results in the formation of strong molecular bridges between a range of organic substrates and elastomeric sealants leading to significantly improved bonding. The technology has been successfully adopted by global automotive industry for improving adhesion of a variety of adhesives and coatings to polyolefinic substrates.

    Keywords:

    adhesion, surface engineering, durability, silicone adhesion, organic substrate, metallic substrate, molecular brushes, silicones, polyethyleneimines


    Author Information:

    Gutowski, W. (Voytek) S.
    Associate Professor, Dr.-Ing., CSIRO Materials Science and Engineering, Interphase Engineering and Intelligent Materials Surfaces Group, Melbourne, Victoria

    Toikka, Gary
    CSIRO Materials Science and Engineering, Interphase Engineering and Intelligent Materials Surfaces Group, Melbourne, Victoria

    Li, Sheng
    CSIRO Materials Science and Engineering, Interphase Engineering and Intelligent Materials Surfaces Group, Melbourne, Victoria


    Paper ID: STP154520120010

    Committee/Subcommittee: C24.30

    DOI: 10.1520/STP154520120010


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