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Flashcards in Adhesion Deck (16)
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1

the bond fails at the interface between 2 surfaces

adhesive failure

2

for adhesive failure, the bulk of adhesive retained on -

only one surface

3

the bond fails within one of the substrates but not at the interface

cohesive

4

for cohesive failure, the adhesive is retained on --

both surfaces

5

angle formed when a drop of liquid is placed on a solid surface

contact angle

6

contact angle is a useful measure of -- of solids by liquids

wettability

7

low contact angle (< 90)

good wetting

8

high contact angle (> 90)

poor wetting

9

adherend -- energy

surface

10

high surface energy -- attachment

good

11

low surface energy or -- is poor attachment

contaminated

12

examples of high surface energy

metals, oxides

13

examples of low surface energy

wax, Teflon

14

forces of physical adhesion

secondary interatomic/intermolecular forces
weak, short range forces

15

secondary interatomic or intermolecular forces in physical adhesion

H bond, van de Waals

16

weakest bonding

physical adhesion