抄録
The excluded volume effect of chain polymers is calculated by using the flexible random coil model.
The intramolecular energy of polymer is assumed to be given by the product of the binary cluster integral of polymer segments and their contact probability which is determined from a segments-distribution function appropriately assumed. This intramolecular energy becomes a function linearly decreasing with the end to end distance of the polymer.
The result of excluded volume effect obtained from this potential function coincides almost with that by the third order perturbation theory. The expansion coefficient α of the end to end distance can be given by the approximate equation
αx−αx−2=(2π⁄3)1⁄2z, x=4.3∼5.0,
where z is the interaction parameter of segments.
The intramolecular energy function assumed is compared with the expression obtained by Fujita et al., and the segments-distribution function is recalculated, which is found to be nearly the same as that first assumed.
