J. Phys. II France
Volume 7, Numéro 12, December 1997
Page(s) 1893 - 1916
DOI: 10.1051/jp2:1997220
J. Phys. II France 7 (1997) 1893-1916

Tack of a Polymer Melt: Adhesion Measurements and Fracture Profile Observations

Thierry Ondarçuhu

Centre d'Élaboration des Matériaux et d'Études Structurales (C.E.M.E.S.) U.P.R. C.N.R.S. 8011, 29 rue Jeanne Marvig, 31055 Toulouse Cedex 4, France

(Received 2 June 1997, revised 24 July 1997, accepted 1 September 1997)

We present an experimental study of the tack of a model polymer melt by the probe tack test coupled with an optical observation of the fracture profile. This set-up allowed us to study the different processes involved in tack and to estimate their importance. We distinguished three different regimes that can be correlated to the rheological properties of the adhesive. In particular, the regime where viscoelastic losses in the bulk of the polymer are important is discussed in detail, in the frame of a recent model by de Gennes. We found, in this case, an enhancement of the energy of adhesion and put into evidence peculiar fracture profiles similar to the "trumpet" profile predicted by the model. We also studied the influences of surface roughness and polymer adsorption on the formation of the bond.

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