中文摘要：

利用格子Monte Carlo（MC）模拟方法研究了均聚物/两嵌段共聚物/均聚物（A/AB/B）共混体系中均聚物分子链长对界面性质的影响.研究结果表明,当两嵌段共聚物的分子链长N_C=20时,随着均聚物分子链长N_H从10增至60,界面厚度增加,取向参数q随着均聚物分子链长的增长而先减小后增大,即共聚物分子在垂直界面方向的拉伸程度先减弱后增强;当两嵌段共聚物的分子链长N_C=60时,随均聚物分子链长的增加,界面厚度减小,共聚物分子链取向参数q减小,分子在垂直界面方向的拉伸程度减弱.

英文摘要：

We employed Monte Carlo simulation to investigate the effects of chain length of the homopolymer on the interracial properties between two immiscible homopolymers. When the chain length of diblock copolymer is fixed at Nc = 20, as the chain length（NH ） of homopolymer increases from 10 to 60, the interface thickness increases significantly. The orientation parameter q of the diblock copolymer chain decreases with the increase of Nn from 10 to 40, but enlarges with the further increase of homopolymer chain length, which means that the stretching of diblock copolymer displays a non-monotonic dependence on the homopolymer chain length. When the diblock copolymer chain length is fixed as Nc = 60, as the chain length of homopolymer increases from NH = 10 to 60, the interface thickness decreases and the diblock copolymer chain orientation parameter q decreases, indicating that the stretching of diblock chain is weakened.