Page 60 - Handbook of Adhesion Promoters

3.6 Peeling 53

The adhesion mechanism of a viscoelastic thin-film on a substrate was studied using
peeling experiment of a viscoelastic polyvinylchloride thin-film on a rigid substrate
(glass). The effects of peeling rate, peeling angle, film thickness, surface roughness and
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the interfacial adhesive on the peel-off force were evaluated. The viscoelastic properties
of the film and the interfacial adhesive contribute to the rate-dependent peel-off force. 24
The peel-off force decreases with the increasing peeling angle. Increasing film thickness
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or substrate roughness leads to an increase of the peel-off force. The energy release rate
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increases with the increase of peeling rates or peeling angles. The adhesive filamentation
in the cohesive zone was stretched and the cohesive zone did not propagate until the active
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filamentation was broken. The length of the cohesive zone was found to increase with
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the increasing peeling rate (Figure 3.7).
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