ON EQUATIONS OF STATE FOR HARD CHAIN FLUIDS

Several equations of state for hard chains that have been reported in the literature are tested against the simulation data of Gao and Weine r. It is found that the thermodynamic perturbation theory (TPT-2) of W ertheim and the generalized Flory-Dimer theory (GF-D) of Honnell and H all are the most accurate. A form of the GF-D theory which includes in formation about the trimer fluid is investigated. The new equation is better than the GF-D and TPT-2 equations at low densities, but not as good as the GF-D or the TPT-2 equations at high densities.