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The surface-free energies of several solids, including a series of alkyl esters of cellulose, were estimated using recent theories of Zisman, Fowkes, Girifalco, Good, and Kraus. Using these values, the relative works of adhesion between a pressure-sensitive adhesive and the solids were estimated. The work of adhesion is directly proportional to the critical surface energy of the solid. Assuming a covariance between the critical surface energy and the boundary cleavage stress, it was shown that the change in peel force was explained reasonably well by the change in work of adhesion. The possibility of accounting for the trend in peel force by the variation in tensile strength of the cellulose esters is discounted, but the adhesion data for the cellulose esters can be explained qualitatively by the theory of Sharpe and Schonhorn.
Dahlquist, C. A.
Minnesota Mining and Manufacturing Co., St. Paul, Minn.