The effect of surface features on nanorheology of LCP melts in nanochannels by MD simulation

Lan He, Kai Leung Yung, Yan Xu, Yun Wen Shen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The effects of wall surface features on the rheological properties and phase orientation of liquid crystalline polymer (LCP) melts flowing in a nanochannel have been first investigated by molecular dynamics (MD) simulations. The surfaces are modeled as rough atomic serrated walls whereby the roughness is characterized by the period and amplitude of serration. The molecular chains of LCPs are depicted by a newly developed molecular model named the GB-spring-bead model. Through simulating the phase formation of LCP melts, the new model was evaluated and the results have shown the new model is efficient and accurate to describe semi-flexible main-chain LCP molecules. MD simulations of the effect of wall surface features on the LCP shear flow were conducted and the results have revealed the surface features affect greatly the rheological properties and phase orientations of LCP melts in a nanochannel (the distance between the upper wall and the lower wall is 12.8 nm). Findings in this study provide very useful information in the injection molding of plastic products with nanofeatures.
Original languageEnglish
Pages (from-to)171-176
Number of pages6
JournalJournal of Tribology
Volume129
Issue number1
DOIs
Publication statusPublished - 1 Jan 2007

Keywords

  • GB-spring-bead model
  • Liquid crystalline polymers
  • Molecular dynamics simulations
  • Orientational order parameter
  • Shear viscosity
  • Surface roughness

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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