Presentation on theme: "Alexei E. Likhtman, Sathish K. Sukumuran, Jorge Ramirez"— Presentation transcript:
1 Entanglements and stress correlations in coarsegrained molecular dynamics Alexei E. Likhtman,Sathish K. Sukumuran,Jorge RamirezDepartment of Applied Mathematics,University of Leeds, Leeds LS2 9JT, UK
3 The missing link Many chains system One chain model The ultimate goal: Stochastic equation of motionfor the chain inself-consistent entanglement fieldMany chains system+ self-consistent fieldOne chain model
4 Is there a tube model?Best definition of the tube model: one-dimensional Rouse chain projected onto three-dimensional random walk tube.Open questions:Can I have expression for the tube field, please?How to “measure” tube in MD?Is the tube semiflexible?Diameter = persistence length?Branch point motionHow does the contour length changes with deformation?Tube parameters for different polymers?Tube parameters for different concentrations?
5 Rubinstein-Panyukov network model Rubinstein and Panyukov, Macromolecules 2002, 6670
17 Questions for discussion Binary nature of entanglements?Can one propose an experiment which contradicts this?Non-linear flows:do entanglements appear in the middle of the chain?Is there an instability in monodisperse linear polymers?