[article]
| Titre : |
Surface-activated rubber particles improve structural adhesives |
| Type de document : |
texte imprimé |
| Auteurs : |
Michael J. Gerace, Auteur ; Janet M. Gerace, Auteur ; Mark A. Williams, Auteur |
| Année de publication : |
1995 |
| Article en page(s) : |
p. 26-31 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Adhésifs structuraux
Assemblages collés
Caoutchouc
Epoxydes
Formulation (Génie chimique)
Mouillage (chimie des surfaces)
Polyuréthanes
Résistance au cisaillement
|
| Index. décimale : |
668.3 Adhésifs et produits semblables |
| Résumé : |
Perhaps the most critical characteristic for an adhesive in its end use is the strength of the bond it forms. In practice, many factors can affect adhesive joint strength, including the internal strength of the adhesive, the ability of the adhesive to wet the substrate, the bond thickness, and the adhesive bonding area. The internal strength of the adhesive is often related to its modulus, which is a measure of the stiffness of the material. As a rule of thumb, both very high or very low modulus materials are undesirable as adhesives. A material with too high a modulus will tend to be brittle, causing the material to crack under stress. A low modulus material is often weak and tears easily.
Rubber can be used as a modulus modifier in many adhesives. This tough, flexible material resists both cracking and tearing. Because of its desirable elastomeric properties, rubber can be used to modify materials with unacceptable moduli. Unfortunately, rubbers are incompatible with many structural adhesives because many rubbers are nonpolar, and the ingredients in many structural adhesives are polar in nature.
The purpose of this paper is to introduce Vistamer rubber, a low-cost, surface-activated rubber particle that is readily incorporated into structural adhesive formulations. Vistamer rubber makes it possible to combine the elasticity and toughness of rubber with the desirable properties of polar structural adhesives. The following sections will explore some fundamentals of adhesion and demonstrate how moduli can affect adhesive properties. Then we will discuss Vistamer rubber and see how it has increased the adhesive strength of two structural adhesive systems, an epoxy and a polyurethane. Testing indicates that Vistamer rubber can be used as a "modulus modifier" that either reduces the modulus of a brittle adhesive or increases the modulus of a weak adhesive. The benefit to the formulator is a single, low-cost material that can improve the strength and flexibility of structural adhesives. |
| Note de contenu : |
- FUNDAMENTALS OF ADHESION : Adhesives forces - Surface wetting - Adhesive joint - Adhesive modulus
- VISTAMER RUBBER
- VISTAMER RUBBER IN AN EPOXY ADHESIVE
- VISTAMER RIBBER IN A POLYURETHANE ADHESIVE |
| En ligne : |
https://drive.google.com/file/d/1vVKGivweoryDnW6SIjgAeDTOXzTwro05/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20799 |
in ADHESIVES AGE > Vol. 38, N° 13 (12/1995) . - p. 26-31
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