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

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

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3 the evolution of E as a funetion of Me, both seales being logarithmie. Despite experimental seatter a fairly linear relationship may be seen. The Flory-Rehner relationship for Me is of doubtful aeeuraey for both very high and very low degrees of erosslinking. 1 is obtained. good agreement with the theory of rubber elasticity. This is in fairly The elastic modulus of a rubber may be written [12]: E : 4 where N equals the average number of monomer units, each of volume v, between crosslinks, kT represents Boltzmann's constant multiplied by absolute temperature and m is a numerical constant of order 1.

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. Suffiee it to say that in a general manner, apparent equilibrium is reaehed faster for highly erosslinked hemispheres than for those of greater Me.

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.

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