Physico-Chemical Factors Affecting Hydrothermal Resistance and Bonding of Polymeric Composites to Steel Surfaces

摘要

The failure upon exposure to hydrothermal conditions of most conventional polymers containing functional groups in which any two atoms selected from N, O, and S are joined to the same carbon atom, is generally due to 1) high segmental mobility of molecular chains, 2) low thermal relaxation of the polymers, 3) an increase in hydrophilic groups, and 4) low dynamic mechanical properties. Each of these factors must be considered in attempting to provide the total protection needed for long service life in hydrothermal environments. Therefore, the physico-chemical factors that determine the hydrothermal stability and the bonding characteristics of inorganic macromolecule-ionomer composite films have been investigated. Contents include: Self-Healing Type Methylmethacrylate Composite Coatings; Nature of Interfacial Interactions Between Polymers and Phosphate-Treated Metal Surfaces; and Characteristics of Polyelectrolyte-Modified Zinc Phosphate Conversion Precoatings. Keywords: Stiffness; Adhesion; Cold Rolled Carbon Steel.