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Toughening Epoxy Adhesives to Meet Today's Challenges

Published online by Cambridge University Press:  31 January 2011

A. J. Kinloch
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Abstract

There are many advantages that polymeric adhesives can offer compared with the more traditional methods of structural joining such as bolting, brazing, welding, and mechanical fastening, and epoxy adhesives represent the most common type of structural adhesive. When polymerized, epoxy adhesives are amorphous and highly cross-linked materials, and this microstructure results in many useful properties for structural engineering applications, such as a high modulus and failure strength, low creep, and, by careful formulation, good performance at elevated temperatures. However, the structure of such thermosetting adhesives also generally leads to one highly undesirable property: they are relatively brittle materials, with poor resistance to crack initiation and growth. Nevertheless, the incorporation of a second phase of dispersed rubbery particles into the epoxy polymer can greatly increase their toughness without significantly impairing their other desirable engineering properties. Thus, rubber-toughened epoxy adhesives can be used, for example, in applications where very high impact resistance is required for the bonded joint.

Keywords

epoxy adhesivesfracturemicrostructurepolymersstructural adhesivestoughening
Type
Research Article
Information
MRS Bulletin , Volume 28 , Issue 6: Materials Science of Adhesives: How to Bond Things Together , June 2003 , pp. 445 - 448
Copyright
Copyright © Materials Research Society 2003

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