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Designing Soft Reactive Adhesives by Controlling Polymer Chemistry

Published online by Cambridge University Press:  31 January 2011

Agnès Aymonier  and
Eric Papon
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Abstract

Soft reactive adhesives (SRAs) are polymer-based materials (e.g., polyurethanes, polysiloxanes, polydienes) designed to be further vulcanized or slightly cross-linked through external activation (heat, moisture, oxygen, UV–visible irradiation, etc.), either at the time of their application or within a subsequent predefined period. They are used mainly as mastics, or sealing compounds, in a wide range of industrial and commercial fields such as construction, footwear, and the automotive industry. Generally deposited as thick films, SRAs behave as structural adhesives; their low elastic moduli accommodate large strains between the bonded parts without incurring permanent damage. Other outstanding attributes of SRAs are their resistance to solvents, their ability to withstand aggressive environments, and their ease of use. This article discusses examples of SRAs and, more specifically, shows how the cross-linking chemistry, mainly through step-growth polymerization, provides their primary advantages.

Keywords

chain polymerizationpolyurethanes (PURs)siliconessoft reactive adhesives (SRAs)step-growth polymerization
Type
Research Article
Information
MRS Bulletin , Volume 28 , Issue 6: Materials Science of Adhesives: How to Bond Things Together , June 2003 , pp. 424 - 427
Copyright
Copyright © Materials Research Society 2003

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