三级相互作用对聚亚甲基链末端距四次矩的影响

Effect of Third-order Interaction Approximation on Fourth Moment of End-to-end Distance of Polymethylene Chains

本文用三级相互作用近似理论导出了高分子链末端距的四次矩的计算公式。计算聚亚甲基链的末端距四次矩,并同二级相互作用的结果进行了比较。对于聚亚甲基链,三级相互作用近似的四次矩小于二级相互作用近似的四次矩。

In this paper, fourth moment of end-to-end distance of polymethylene chains in the third-order interaction approximation is calculated. Comparisons with the second-order interaction approximation are also made. It is found that the ratio <R^4> / N^2l^4 in the third-order interaction approximation is less than that in the second-order interaction approximation.