高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (4): 629.

• 论文 • 上一篇    下一篇

端点附壁的高分子链形状的MonteCarlo模拟

黄建花, 蒋文华, 韩世钧   

  1. 浙江大学化学系, 杭州 310027
  • 收稿日期:1999-05-27 出版日期:2000-04-24 发布日期:2000-04-24
  • 通讯作者: 韩世钧(1939年出生),男,教授,博士生导师,主要从事热力学研究.
  • 基金资助:

    国家自然科学基金重点项目(批准号:29736170)

A Monte Carlo Simulation on Shape of Grafted Polymer Chains

HUANG Jian-Hua, JIANG Wen-Hua, HAN Shi-Jun    

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
  • Received:1999-05-27 Online:2000-04-24 Published:2000-04-24

摘要: 分别基于简立方格点和四面体格点模型对一端吸附在无限大平面的高分子链(平面接枝高分子链)的形状进行了MonteCarlo摸拟.结果表明,接枝高分子链的形状更偏离球形,〈L12〉∶〈L22〉∶〈L322〉的极限值约为1∶2.75∶12.5,其中〈L12〉,〈L22〉和〈L322〉分别为回转半径张量的本征值L12,L22和L322(L12<L22<L322)的统计平均;链长相同时,接枝高分子链的比值〈L22〉/〈L12〉和〈L322〉/〈L12〉均比自由(稀溶液中)高分子链的大,且与高分子链的格点模型有关.这表明平面接枝高分子链由于部分构象的消失而导致形状变化.

关键词: 高分子链, 形状, MonteCarlo模拟

Abstract: The shape of polymer chain on a simple cubic and a tetrahedral lattice, with one end absorbed by an impermeable wall, was studied with Monte Carlo technique. The results show that the shape of grafted polymer chains is more deviated from sphere than that of free ones. The limit value of 〈 L12〉∶〈 L22〉∶〈 L32〉 of grafted polymer chains is about 1∶2.75∶12.5; the values of 〈 L22〉/〈 L12〉 and 〈 L32〉/〈 L12〉 of grafted polymer chains are bigger than those of free ones, they decrease with the increase of chain length. It is found that the deviation of 〈 L22〉/〈 L12〉 and 〈 L32〉/〈 L12〉 of grafted polymer chains from those of free ones depends on chain′s lattice model.

Key words: Polymer chain, Shape, Monte Carlo simulation

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