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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

10.1002/chem.19970031218

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1435-1528

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Linear viscoelasticity of styrenic block copolymer

Authors: Danilo Justino Carastan Nicole Raymonde Demarquette Alexandre Vermogen Karine MasenelliVarlot
Publish Date: 2008/05/07
Volume: 47, Issue: 5-6, Pages: 521-
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Abstract

In this work the rheological behavior of block copolymers with different morphologies lamellar cylindrical spherical and disordered and their claycontaining nanocomposites was studied using small amplitude oscillatory shear The copolymers studied were one asymmetric starblock styrene–butadiene–styrene copolymer and four styrene–ethylene/butylenes–styrene copolymers with different molecular architectures one of them being modified with maleic anhydride The nanocomposites of those copolymers were prepared by adding organophilic clay using three different preparation techniques melt mixing solution casting and a hybrid melt mixing–solution technique The nanocomposites were characterized by Xray diffraction and transmission electron microscopy and their viscoelastic properties were evaluated and compared to the ones of the pure copolymers The influence of copolymer morphology and presence of clay on the storage modulus G′ curves was studied by the evaluation of the changes in the low frequency slope of log G′× logω ω frequency curves upon variation of temperature and clay addition This slope may be related to the degree of liquid or solidlike behavior of a material It was observed that at temperatures corresponding to the ordered state the rheological behavior of the nanocomposites depended mainly on the viscoelasticity of each type of ordered phase and the variation of the slope due to the addition of clay was small For temperatures corresponding to the disordered state however the rheological behavior of the copolymer nanocomposites was dictated mostly by the degree of clay dispersion When the clay was well dispersed a strong solidlike behavior corresponding to large G′ slope variations was observed


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  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
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  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
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  22. A computational extensional rheology study of two biofluid systems
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