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Title of Journal: Rheol Acta

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Abbravation: Rheologica Acta

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Springer-Verlag

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1435-1528

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Influence of molecular parameters on the stress de

Authors: Julia A Resch Joachim Kaschta Friedrich Wolff Helmut Münstedt
Publish Date: 2010/11/16
Volume: 50, Issue: 1, Pages: 53-63
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Abstract

The stress dependencies of the steadystate viscosity η and particularly that of the steadystate elastic compliance J e of various linear isotactic polypropylenes PP and one longchain branched PP are investigated using creeprecovery tests The creep stresses applied range from 2 to 10000 Pa In order to discuss the stressdependent viscosity η and elastic compliance J e with respect to the influence of the weight average molar mass M w and the polydispersity factor M w/M n the PP are characterized by SEC–MALLS For the linear PP linear steadystate elastic compliances J rm e0 in the range of 10 − 5–10 − 3 Pa − 1 are obtained depending on the molar mass distribution J rm e0 of the LCBPP is distinctly higher and comes to lie at around 10 − 2 Pa − 1 J rm e0 is found to be independent of M w but strongly dependent on polydispersity η and J e decrease with increasing stress For the linear PP J e as a function of the stress τ is temperature independent The higher M w/M n the stronger is the shear thinning of η and the more pronounced is the stress dependence of J e For the LCBPP the strongest stress dependence of η and J e is observed Furthermore for all PP J e reacts more sensitively to an increasing stress than η A qualitative explanation for the stronger stress dependence of J e compared to η is given by analyzing the contribution of long relaxation times to the viscosity and elasticityThe authors would like to thank the German Research Foundation DFG for the financial support of this work The contributions of Mrs Inge Herzer Mrs Marika Sturm and Mrs Michelle Malter regarding the SEC–MALLS the IRspectroscopy and the DSC measurements are gratefully acknowledged Prof Dr Florian Stadler School of Semiconductor and Chemical Engineering Chonbuk National University deserves acknowledgement for the calculation of the relaxation spectrum and its evaluation concerning η 0 and J rm e0


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Other Papers In This Journal:

  1. Effect of morphology on the interfacial slip of immiscible polypropylene/polystyrene blends
  2. Amorphous and crystalline states of ultrasoft colloids: a molecular dynamics study
  3. A hierarchical multi-mode MSF model for long-chain branched polymer melts part II: multiaxial extensional flows
  4. Novel bitumen/isocyanate-based reactive polymer formulations for the paving industry
  5. Can dynamical mechanical measurements predict brittle fracture behaviour?
  6. Self-reinforcement of polymers as a consequence of elongational flow
  7. The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
  8. Influence of the initial cooling temperature on the gelation and yield stress of waxy crude oils
  9. Molecular architecture and linear viscoelasticity of homogeneous ethylene/styrene copolymers
  10. Flow analysis of the weld line formation during injection mold filling of thermoplastics
  11. Squeeze flow of soft solids between rough surfaces
  12. Molecular orientation in non-Newtonian flow of dilute polymer solutions around spheres
  13. The contribution of frictional contacts to the shear strength of coarse glass bead powders and slurries
  14. End effects in rotational viscometry II. Pseudoplastic fluids at elevated Reynolds number
  15. Rheological behaviour of a high-melt-strength polypropylene at elevated pressure and gas loading for foaming purposes
  16. The effect of premature wall yield on creep testing of strongly flocculated suspensions
  17. Rheological and morphological properties of PA6/ECO nanocomposites
  18. Orientation distribution in injection molding: a further step toward more accurate simulations
  19. Fractal analysis of viscoelastic data with automated gel point location and its potential application in the investigation of therapeutically modified blood coagulation
  20. Modeling confinement in polymer nanocomposites from linear viscoelasticity data
  21. Linear viscoelasticity of styrenic block copolymers–clay nanocomposites
  22. On exact solutions of the flow equations for Bingham visco-plastic fluids through an eccentric annular cross-section
  23. A computational extensional rheology study of two biofluid systems
  24. Power-law creep and residual stresses in a carbopol gel
  25. Electrorheological response of SnO 2 and Y 2 O 3 nanoparticles in silicon oil
  26. Generation of inkjet droplet of non-Newtonian fluid
  27. Scaling and mesostructure of Carbopol dispersions
  28. Study of the non-isothermal glass fibre drawing process
  29. An error-minimizing approach to inverse Langevin approximations

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