The name is absent



derson [76, 77] for atomic fluids to chain-like fluids. It is a second-order perturbation
theory, in which the Helmholtz free energy is given as a sum of first- and second-order
contributions, as

^disp j^disp ^disp

(2.20)


NKT = NKT + NKT'

For chain-like molecules, the first and second term of the perturbation expansion have

the following form

/I '^>'>-'t'                                 ________ ________ zr

Zl1                    τ r' X ʌ                 z ∖  4

(2.21)


= -2πpl1 ^^xixjmimj(-)σij,

i j

and

NKT


= —крЪт


± + Zhc +      H ∑ xixjmimj⅛)¾

' i j


(2.22)


where Zhc is the compressibility factor of the hard-chain fluid, the parameters eŋ and
σij are obtained by conventional Berthelot-Lorentz mixing rules, m is the average
chain length of the mixture defined as

(2.23)


771 = ximiι
i

and ʃi and I<z are integrals given as


(2.24)


45




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