Stress—Strain Isotherms for Poly‐(Dimethylsiloxane) Networks

摘要

Stress—strain isotherms are presented for poly-(dimethylsiloxane) networks of different degrees of cross linking, swollen to various extents by a diluent. Results are interpreted in terms of the equation f*v213V*/(α-α-2)=2C1+2C2α-1, where f* is the tension per unit initial area (unswollen) exhibited by a network when swollen to a polymer volume fraction v2 and elongated to the relative length α, 2C1 is a parameter of the network structure established by the molecular theory of rubber elasticity, and 2C2 is an additional parameter found to give a better representation of experimental data. Values of C2 obtained for networks are found to decrease as the degree of cross linking is decreased, and the degree of swelling is increased.