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THE FUNCTION OF ADHESION PROMOTERS IN ADHESIVE BONDING.
NAVAL RESEARCH LAB WASHINGTON D C
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The wet strength of adhesive bonds between resins and glass or metal can be substantially improved by applying adhesion promoters to the glass or metal surface. The most widely used of these adhesion promoters are the organofunctional trialkoxysilanes RSiOR3. Some of the more pertinent research results concerning these silanes have been reviewed in the hope of establishing how they function as finishing agents. Work indicates that these compounds form polysiloxane coatings on the adherend surface. These coatings consist of a strongly adsorbed polysiloxane network along with a more weakly held material consisting of small polymer molecules and unreacted silane. The polysiloxane network exposes a high density of the organofunctional group R- at the airsilane-coating interface. However, the R- groups are not closely spaced, and, in fact, there is some evidence that the coatings can be penetrated by the adhesive resin. Some new approaches are offered for research into the highly complex but exceedingly important area of adhesion promoters. Author
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