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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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DOI

10.1016/0377-0257(83)80024-x

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1435-1528

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Selfreinforcement of polymers as a consequence of

Authors: Roman Čermák Martin Obadal Veronika Habrová Karel Stoklasa Vincent Verney Sophie Commereuc Frédéric Fraïsse
Publish Date: 2005/11/04
Volume: 45, Issue: 4, Pages: 366-373
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Abstract

In this study attention is directed towards the abilities of elongational flow to induce the chain orientation and as a consequence to improve the properties of extruded profiles A noveldesigned extrusion die with semihyperbolic convergency of the channel by which a high percentage of elongational flow in the melt is generated was connected with a conventional singlescrew extruder Commercial grades of highdensity polyethylene and isotactic polypropylene were used as model commodity polymers Round extrudates prepared by this processing line were assessed as selfreinforced products Detailed structural observation carried out with the aid of scanning electron microscopy and wideangle Xray scattering evidenced that the structure of extruded rods is uniquely fibrous and highly oriented throughout the profile As a result the selfreinforced extrudates possess outstanding storage modulus in a wide range of temperatures and considerably higher melting point and fusion heat than rods produced by conventional extrusionThe authors kindly acknowledge the support provided by the Czech Science Foundation GAČR project 106/03/P144 and the Ministry of Education Youth and Sports of the Czech Republic FRVŠ project G1 CR 2921/2005 The authors are also grateful to Prof Jaroslav Vaculík for his help in scanning electron microscopy and Mr Joël Cellier for WAXS measurements One of the authors RČ thanks ESNCCF/Université Blaise Pascal ClermontFerrand France and Tomas Bata University in Zlín Czech Republic for their support during his stay


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

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