Calorimetric investigation of autoacceleration in the metal-catalysed cure of anaerobic adhesives

• Published in: Journal of adhesion science and technology 1998-01, Vol.12 (12), p.1281-1297
• Main Authors: George, B., Grohens, Y., Touyeras, F., Vebrel, J.
• Format: Article
• Language: English
• Subjects: activation energies; Anaerobic adhesives; Applied sciences; autoacceleration; Cellular; differential scanning calorimetry; Exact sciences and technology; Forms of application and semi-finished materials; gel effect; Polymer industry, paints, wood; Technology of polymers
• ISSN: 0169-4243; 1568-5616
• DOI: 10.1163/156856198X00443

Abstraet-The polymerization of anaerobic adhesives is a complex reaction which is influenced by many parameters such as the atmosphere, the temperature, and the nature of the substrates to be bonded. The aim of this work was to explore a simple and reliable analytical method using differential scanning calorimetry (DSC) to investigate the parameters which affect the polymerization of three commercial adhesive products. The kinetics of the reaction is deduced from values of the activation energies E a , and the influence of the polymerization conditions on the autoacceleration of the systems is shown, i.e. the time at which an increase of reaction speed occurs. The reactivity of the anaerobic adhesives is largely favoured by the use of copper metal rather than iron or aluminium as previously assumed and by the absence of oxygen in the ambient. However, in this last case surprisingly the autoacceleration proceeded more slowly than for experiments conducted in the presence of air. This trend was observed irrespective of the substrate under investigation.