中国物理B ›› 2012, Vol. 21 ›› Issue (8): 88301-088301.doi: 10.1088/1674-1056/21/8/088301

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Effect of shear on the symmetric diblock copolymer/nanorod mixture: A dissipative particle dynamics study

何林李, 张瑞芬, 季永运   

  1. Department of Physics, Wenzhou University, Wenzhou 325035, China
  • 收稿日期:2011-12-16 修回日期:2012-02-04 出版日期:2012-07-01 发布日期:2012-07-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 21074096 and 21104060).

Effect of shear on the symmetric diblock copolymer/nanorod mixture: A dissipative particle dynamics study

He Lin-Li (何林李), Zhang Rui-Fen (张瑞芬), Ji Yong-Yun (季永运 )   

  1. Department of Physics, Wenzhou University, Wenzhou 325035, China
  • Received:2011-12-16 Revised:2012-02-04 Online:2012-07-01 Published:2012-07-01
  • Contact: He Lin-Li E-mail:helinli155@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 21074096 and 21104060).

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摘要： The phase behaviours of lamellar diblock copolymer/nanorod composite under steady shear are investigated using dissipative particle dynamics. We consider a wide range of nanorod concentrations, where nanorods each have a preferential affinity to one of blocks. Our results suggest that shear not only aligns the orientations of diblock copolymer templates and nanorods towards flow direction, but also regulates the distribution of nanorods within polymer matrix. Meanwhile, the shear-induced reorientation and morphology transitions of systems also significantly depend on the nanorod concentration. At certain nanorod concentrations, the competitions between shear-induced polymer thinning and nanorods dispersion behaviours determine the phase behaviours of composites. For high nanorod concentrations, no morphology transition is observed, but reorientation is present, in which the sheared nanorods are arranged into hexagonal packing arrays. Additionally, the orientation behaviour of nanorods is determined directly by the applied shear, also interfered by the shear-stretched copolymer molecules.

关键词: dissipative particle dynamics, shear, nanocomposites, orientation

Abstract: The phase behaviours of lamellar diblock copolymer/nanorod composite under steady shear are investigated using dissipative particle dynamics. We consider a wide range of nanorod concentrations, where nanorods each have a preferential affinity to one of blocks. Our results suggest that shear not only aligns the orientations of diblock copolymer templates and nanorods towards flow direction, but also regulates the distribution of nanorods within polymer matrix. Meanwhile, the shear-induced reorientation and morphology transitions of systems also significantly depend on the nanorod concentration. At certain nanorod concentrations, the competitions between shear-induced polymer thinning and nanorods dispersion behaviours determine the phase behaviours of composites. For high nanorod concentrations, no morphology transition is observed, but reorientation is present, in which the sheared nanorods are arranged into hexagonal packing arrays. Additionally, the orientation behaviour of nanorods is determined directly by the applied shear, also interfered by the shear-stretched copolymer molecules.

Key words: dissipative particle dynamics, shear, nanocomposites, orientation

中图分类号:  (Block copolymers)

  • 83.80.Uv
78.67.Sc (Nanoaggregates; nanocomposites)