Physical model of interface and interphase performance in composite materials and bonded polymers

✍ Scribed by Gutowski, W. S.

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 116 KB
• Volume: 272
• Category: Article
• ISSN: 0003-3146
• DOI: 10.1002/(sici)1522-9505(19991201)272:1<51::aid-apmc51>3.0.co;2-v

✦ Synopsis

The 'rheological model' of adhesion developed by Gent and Schultz significantly broadened the applicability of the thermodynamic model of adhesion by accounting not only for the thermodynamic energy of adhesion, but also for the irreversibly dissipated energy occurring during viscoelastic and plastic deformations occurring in the deformed materials and at the crack tip.

This paper provides a review of further, most recent and significant developments of the physical models of adhesion proposed by de Gennes, Le ´ger, Brochard-Wyart and others. It analyzes the theoretical background and experimental results concerning the enhancement of adhesion by surface-grafted molecular chains. These are anchored at the substrate surface and entangled with the crosslinked network of the adjacent polymer. The extraction of the entangled connector molecular chains, when grafted at the optimum surface density, provides significant increase in the bond strength or fracture energy. It occurs due to the energy dissipation taking place during extraction and deformation or fracture of strained macromolecular chains at the propagating crack's tip zone.