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A b e n o j a r , M . A . M a r t í n e z , a n d M . P a n t o j a. A tm o s p h e r i c p r e s s u r e p l a sm a h y d r o p h i l i c m o d i f i c a t i o n o f a s i l i c o n e s u r f a c e , P r e s e n t e d i n p a r t a t t h e 1 s t I n t e r n a t i o n a l C o n f e r e n c e o n S t r u c t u r a l A d h e s i v e B o n d i n g ( A B 2 0 1 1 ) , P o r t o , P o r t u g a l , 7 -8 J u l y 2 0 1 1 .

In the absence of weak boundary layers, surface energy can be an excellent indicator of the suitability of a fiber-reinforced composite surface for adhesive bonding. Mechanical surface treatments such as grit blasting are effective and commonly used to prepare composite surfaces, but the roughness introduced by these treatments makes quantification of the surface energy by contact angle methods difficult. This paper shows that the diameter of a small drop of a low-viscosity fluid chosen to have surface tension characteristics very similar to the adhesive can be used as an effective predictor of adhesive bond fracture energy. This technique could form the basis of a sensitive quality assurance tool for manufacturing.

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Adhesive bonding of structural aircraft materials depends upon a thorough understanding of factors that affect bond strength and durability. It is well known that surface preparation is critical to adhesive bond performance. However, little information is available regarding the effect of surface preparation procedures on adhesive bonding of high-temperature polyimide composites. Mechanical treatments such as hand sanding are commonly used for composite materials, and in general are known to improve the wettability of the surface as well as effect contaminant removal. Less is known about the influence of mechanical treatments on the surface chemistry. This article discusses the effects of mechanical surface preparation on the adhesive bond strength, durability, and failure mode of several high-temperature polyimide-based composites and adhesives.