末端距即高分子链两端间的矢量距，是指线型高分子链的一端至另一端的直线距离。
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。
In this paper, fourth moment of end-to-end distance of polymethylene chains in the third-order interaction approximation is calculated.
进而又研究了单链高分子的弛豫过程，给出了末端距向量自相关函数的弛豫时间。
Furthermore, the author also studied the relaxation of single polymer chain and obtained the relaxation time of the autocorrelation function of the end-to-end vector.
通过计算，研究了单链高分子的均方回转半径、均方末端距以及末端距向量自相关函数随时间的演化过程。
Evolutions of the mean square radius of gyration, the mean square end-to-end distance and the autocorrelation function of the end-to-end vector are simulated.
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