高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

用耗散粒子动力学方法研究高分子链取向对形变液滴回缩法测定界面张力值的影响

毛伟, 孔滨, 杨小震   

  1. 中国科学院化学研究所, 高分子物理与化学国家重点实验室, 北京100080
  • 收稿日期:2007-09-28 修回日期:1900-01-01 出版日期:2008-05-10 发布日期:2008-05-10
  • 通讯作者: 杨小震

Influence of Polymer Chain Orientation on Interfacial Tension Measurement with DDRM Simulated by Dissipative Particle Dynamics

MAO Wei, KONG Bin, YANG Xiao-Zhen*   

  1. State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2007-09-28 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10
  • Contact: YANG Xiao-Zhen

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摘要： 在利用形变液滴回缩法(DDRM)测量了分子共混体系界面张力的过程中, 要求椭球液滴内高分子链应力松弛速度远快于椭球的回缩速度. 我们建立高分子链取向模型, 用耗散粒子动力学研究高分子链的取向及应力松弛对界面张力测量值的影响. 结果表明, 当高分子链沿着流场方向取向时, 应力是否完全松弛对界面张力测量值的影响较大, 当高分子链取向方向垂直于流场方向时, 应力是否松弛对测量值影响较小.

关键词: 耗散粒子动力学, 分子链取向, 界面张力, 形变液滴回缩法

Abstract: When the deformed drop retraction method(DDRM) is used to measure interfacial tension, the elastic relaxation of polymer chain should be faster than the ellipsoidal droplet retraction. We investigated the influence of polymer chain orientation during the retraction processes using DPD method. The result indicates that the influence of orientation is related to the direction of chain orientation. If the direction of chain orientation is parallel to the fluid direction, the measurement of the interfacial tension clearly deviates from the standard, but if it is perpendicular to the fluid direction, the measurement has nearly no deviation.

Key words: Dissipative particle dynamics, Polymer chain orientation, Interfacial tension, Deformed Drop Retraction Method(DDRM)

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