By Stanley E. Wentworth (auth.), K. W. Allen (eds.)

ISBN-10: 9401090823

ISBN-13: 9789401090827

ISBN-10: 940109084X

ISBN-13: 9789401090841

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J. J. Phys. , Ref. Data l, 71, 1953. ' 841, 1972. 10. , Vial, J. J. Chirn. , To be Pub1ished 1988. 11. , These de Doetorat d'Etat, Mai 1980. 11 21. 91 21. 83 21. m-2) at 20°C and'6'D/orat io. 99 see reference 11. m- 2 1 at 20°C and i '/~ ratio. m- 2 ) . 42 11. R. Shanahan,* P. Schreck, J. Schultz Centre de Recherches sur la Physico-Chimie des Surfaces Solides and Ecole Nationale Superieure de Chimie de Mulhouse, 3, rue Alfred Werner, 68093 Nulhouse Cedex, FRANCE 1. INTRODUCTION Consider two optically flat solids put into intimate Cmolecular) contact.

1. At equilibrium, the elastomer becomes slightly flattened and a circular eontact area of radius a results. microscope. The value of a can be readily assessed using a low power Contact area is determined by the minimum of free energy of the system hemisphere/flat where the various contributions to the overall free energy stem from adhesion (W), elastic strain energy within the deformed hemisphere, and potential (gravitational) energy due to the weight of the flat (P). -J = 3 32 'IT Eo. 3 e6E~3 9R ~2 3 where E is the Young's modulus of the elastomer and R is the hemispherical radius.

2. It PRINCIPLE will be assumed that surface of contributions from each molecule. Calculation successfully energy results from the sum chemical of group solubility component parameter has of a been developed by Small [8] who used a similar group contribution method. Let us consider a liquid L having the following chemical pattern: A-(B)n-2 - A L We want to express the surface energy of L, of n and of the suppose group contributions, ~ t n as a function and '6 B' If we L to be a mixture of A and B groups, and if we admit a statistical distribution number A of A and B at the surface, the of A groups at the surface is proportional to 2/n and B to n-2/n.

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Adhesion 13 by Stanley E. Wentworth (auth.), K. W. Allen (eds.)


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