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

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Logarithm of elastic modulus, E, vs log Mc ' Symbols as in Fig. m- 2 ) c 73 50 46 64 56 42 55 Nevertheless, two observations can be clearly made for each of the systems studied: a) values of Wr increase markedly with Me' b) Wc is generally fairly low and would seem to vary in a random manner We shall therefore suppose that Wc is independent of Me within limits of experimental error. Forced adhesion experiments involve initial elastomerie strains in exeess of those found at equilibrium. rt is therefore eonceivable that the pre- equilibrium states provoke some creep of the polymer leading to exaggerated values of contact radius, a, and therefore adhesion, WI .

As previously stated, values eorresponding to very high and to very low Me must be taken with reserve, given the limitations of the Flory-Rehner theory. -------' E (MPa) Figure 3. • Logarithm of elastic modulus, E, vs log Mc ' Symbols as in Fig. m- 2 ) c 73 50 46 64 56 42 55 Nevertheless, two observations can be clearly made for each of the systems studied: a) values of Wr increase markedly with Me' b) Wc is generally fairly low and would seem to vary in a random manner We shall therefore suppose that Wc is independent of Me within limits of experimental error.

3. 2, Young's modulus of the SBR erosslinked to various degrees was determined by the indireet method of measuring eontaet radii of heavy dises and using equation 3. In order to investigate the validity of this proeedure and, at the same time, that of the determination of Me by swelling intolmuene, we eonsider in Fig. 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.

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