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How does tack depend on time of contact and contact pressure?

✍ Scribed by Costantino Creton; Ludwik Leibler

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
813 KB
Volume
34
Category
Article
ISSN
0887-6266

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✦ Synopsis

The tack of polymer melts on rigid substrates under conditions of short contact times and low pressures is examined. The substrate is modeled as a random rough surface with a distribution of asperities heights. The true contact area between the adhesive and the substrate is calculated for a given total load and elastic modulus of the substrate. The dependence of tack on contact time is accounted for by introducing the relaxation of the adhesive through a time-dependent elastic modulus. For relatively high pressures the tack is predicted to scale with 1/E so that for short contact times, tc, the tack is predicted to scale with (&/T~)"', where T, is the entanglement time. For lower pressures this simple scaling law is no longer valid and we predict a complex variation of tack with contact time and molecular parameters.

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