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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 .

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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.