高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (5): 970.

• 研究论文 • 上一篇    下一篇

对高分子体系进行分子动力学模拟方法的研究

沈荣欣1, 方亚寅1,2, 赵伟1, 孙宏伟1, 袁满雪1, 赖城明1   

  1. 1. 南开大学化学系, 天津 300071;
    2. 徐州师范大学化学系, 徐州 221009
  • 收稿日期:2001-01-08 出版日期:2002-05-24 发布日期:2002-05-24
  • 通讯作者: 赖城明(1934年出生),男,教授,博士生导师,主要从事分子模拟及结构化学研究.E-mail:laichm@nankai.edu.cn E-mail:laichm@nankai.edu.cn
  • 基金资助:

    国家自然科学重点基金(批准号:29832050);教育部高等学校骨干教师资助计划项目资助.

Research on Molecular Dynamic Simulation in Macromolecular System

SHEN Rong-Xin1, FANG Ya-Yin1,2, ZHAO Wei1, SUN Hong-Wei1, Yuan Man-Xue1, LAI Cheng-Ming1   

  1. 1. Department of Chemistry, Nankai University, Tianjin 300071, China;
    2. Department of Chemistry, Xuzhou Normal University, Xuzhou 221009, China
  • Received:2001-01-08 Online:2002-05-24 Published:2002-05-24

摘要: 以单链聚乙烯为例,研究了多种对高分子体系进行分子动力学模拟的方法.结果表明,不同的力场条件可以导致明显不同的结果.在使用OPLS力场的真空条件下.在100K体系出现了玻璃化现象,在200和300K条件下体系出现了局部结晶现象,而在400和500K体系出现了熔化现象.在给定体系中加入周期性边界和在300K下进行分子动力学模拟,无序和结晶状态都具有一定的稳定性.

关键词: 分子动力学模拟, 退火, 聚乙烯, 周期性边界

Abstract: Single polyethylene chain has been used as a model for investigating various molecular dynamic simulation methods that could be useful in the study of macromolecule system.The result of the investigation indicated that different force fields caused obviously different structures of polyethylene.When using OPLSforce field under vacuum condition, the phenomena of vitrification were found at 100 K, the phenomena of local crystallization was found at 200 and 300 K, and the phenomena of melting were found at 400 and 500 K.When the periodic box was added to the system, both the disordered state and crystalline state throw out stability to some extent at 300 Kin molecular dynamic simulation.

Key words: Molecular dynamics simulation, Annealing, Polyethylene, Periodic box

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