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Adhesion and tack of polymers: Influence of mechanical properties and surface tensions

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Abstract

The adhesion of various polymers used as model adhesives, polyisobutylene, polyacrylates etc. has been investigated by means of an apparatus measuring the adhesive failure energyw in dependence on contact time, contact pressure, rate of separation, and temperature. The adhesive failure energy of adhesive joints formed with low contact pressure during a short contact time is called “tack”. After a sufficiently long contact time and with a high bonding pressure an adhesive joint exhibits its maximum energy of separationw m .

The viscoelastic properties of the model adhesives were characterized by creep experiments in dependence on time and temperature. The surface tension of the polymer adhesives and adherents could be determined by contact angle measurements. Adhesion measurements of polyisobutylene on a number of adherents were carried out in air and in various liquids in order to obtain information about the influence of surface tension on tack and maximum adhesive failure energy.

w m can be written as the product of two terms: the thermodynamic work of adhesionW A which is related to the surface and interfacial tensions of adhesive and adherent and a dimensionless function dependent on temperature and rate of separation which describes the viscoeleastic properties of the adhesive and which obeys the rate-temperature superposition principle known from linear viscoelasticity. The tack is related to incomplete bond formation and cannot be described in the same manner. It is, however, strongly dependent on the viscoelastic properties of the adhesive showing a maximum at about 50 to 70 °C above the glass transition temperature. It is, moreover, influenced by the compliance in the plateau range above the glass transition which is determined by the entanglement network of the polymer. Wetting of the adherent by the adhesive is a further important condition for high tack values which is fulfilled if the adherent has a higher surface tension than the adhesive.

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  1. A. Zosel

    Present address: Kunststofflaboratorium, BASF Aktiengesellschaft, Ludwigshafen am Rhein, F.R.G.

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    Zosel, A. Adhesion and tack of polymers: Influence of mechanical properties and surface tensions. Colloid & Polymer Sci 263, 541–553 (1985). https://doi.org/10.1007/BF01421887

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