Time-dependent responses in cross-linking polymers

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Adhesives are polymer-based liquids or films that are used to bond or join components. Structural adhesives have to be cured at elevated temperature to achieve the strength and stiffness needed for joint integrity. Cure is a term used to describe the chemical reaction when liquid resins harden to form a strong cross-linked polymer. An inherent characteristic of polymers is that their physical and mechanical properties are strongly dependent on both time and temperature. This phenomenon, known as viscoelasticity, presents potential problems in engineering since the long-term stability of polymers after processing is not well known.