  Primitive chain network simulations for randomly cross-linked slip-link
networks were performed. For the percolated networks, the stress-strain
relationship was compared to the theories by Ball et al. [Polymer, 22, 1010
(1981)] and Rubinstein and Panyukov [Macromolecules, 35, 6670 (2002)]. The
simulation results were reasonably reproduced by both theories, given that the
contributions from cross-links and slip-links were used as fitting parameters.
However, these parameters were model dependent. Besides, the theories cannot
describe the simulation results if the parameters were determined from the
number of active links involved in the percolated networks. These results
reveal that the fitting of experimental data to the theories does not provide a
fraction of entanglements in the system unless the network only consists of
Gaussian strands and it correctly reaches the state of free-energy minimum.
