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

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It appears that, contrary to a weIl correlated linear relationship is obtained above a minimum n versus given chain val ues of length. n, '1$"" and r, is values are in Tables A-2 and A-3). A summary of gi ven in the data, Table I (~n Under these conditions, ~~ values do not differ very much from the value determined with n-alkanes (less than 13%). 9993 I I I I() ,, o Figure 2. 5 10 n - 2 Linear relationship between n't n' n'l5 n D and n-2 for n-aliphatic primary alcohols. 9962 r I I I 50 o Figure 3.

The weight was removed and the diminishing eontaet radius followed as a funetion of time until (apparent) equilibrium was attained. Equation 3 was employed to ealeulate W. In the seeond type of experiment, referred to as "touehing-on adhesion", aseulating eontaet is established between hemisphere and flat. the radius a inereases towards (apparent) equilibrium. serves to estimate W. After eontaet, Again, equation 3 In both types of experiment, the kineties of evolu- tion towards (apparent) equilibrium has been followed, but in the present eontext, we are essentially interested in statie values of W.

Nevertheless, as Wo, increases, so does the deformation and thus the dissipation. Therefore, although lity between them. W~Wo' there does exist a proportiona- The factor relating them is a function of both strain rate and temperature [2-4] and involves the weIl known principle of time-temperature superposition developed by Williams, Landel and Ferry [5] (WLF). This dissipation process explains matters at finite separation rates. Nevertheless, as the peel rate tends towards zero, so apparently should the hysteresis losses and one would expect the measured adhesion, W, to approach the thermodynamic value, Wo.

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