Theoretical basis and assumptions for the three most widely used equations of state for polymer liquids

named Flory

SL and SS EOSs

and the three new equations of state proposed by the author

named SHT

SHTF and OCM EOSs were introduced in this paper. The com- parisions were made using the

P-V-T

experimental data of 15 polymer liquids

17 large molecular weight hydrocarbons and 6 organic solvehts. The results show that OCM EOS gave the best accuracy

the accuracy became worse in the order of SS

SHT

SHTF

Flory

SL. The conclutions are that

Open - Cell Model is most close to the real structure of liquids

the introduction of holes can improve on the cell model

and that the

L - J

potential can describe the interactions in liquids satisfactorily.