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A Constitutive Analysis of Extensional Flow of EVA Nanocomposites

  • V. Pasanovic-Zujo , Rahul K. Gupta and S. N. Bhattacharya
Published/Copyright: May 2, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 19 Issue 4

Abstract

Linear and nonlinear oscillatory and extensional flow was studied for polymer layered silicate nanocomposites of organically modified bentonite in ethylene-vinyl acetate copolymer with 18 wt.% of vinyl acetate (EVA18). It was found that the rheological properties of EVA18 nanocomposites were distinctly different from the pure copolymer. The elastic response at low frequencies was significantly enhanced in comparison to that of pure EVA18. The linear to nonlinear transition for stress relaxation measurements and the damping function were examined. The relaxation spectrum was shifted toward the longer relaxation time scales for EVA18 nanocomposites, while the dependence of the damping for EVA18 nanocomposites was much stronger than that of the EVA18. In contrast, the uniaxial extensional viscosity of EVA18 nanocomposites gave weaker strain-hardening properties. The prediction of strain-hardening behaviour for EVA18 and EVA18 nanocomposites through relaxation spectrum and the damping function based on Kaye-Bernstein-Kearsley-Zapas (K-BKZ) model is discussed. A simplified estimation of the nonlinear material parameter ß in the K-BKZ model is proposed to predict more accurately the extensional viscosity for EVA18 and EVA18 nanocomposites. Experimental data and detailed predictions are also presented in this paper.

∗ Mail address: S. N. Bhattacharya, Rheology and Material Processing Centre, School of Civil and Chemical Engineering, RMIT University, Melbourne, VIC 3000 Australia E-mail:

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Received: 2004-3-24
Accepted: 2004-7-29
Published Online: 2013-05-02
Published in Print: 2004-12-01

© 2004, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Polymer Processing Society at 20
  5. Mixing and Screw Extrusion
  6. Index for Simultaneous Dispersive and Distributive Mixing Characterization in Processing Equipment
  7. Determination of the Residence Time Distribution in Twin Screw Extruders via Free Radical Modification of PE
  8. On-line Visualization of PS/PP Melting Mechanisms in a Co-rotating Twin Screw Extruder
  9. Die Extrusion
  10. Influence of Filler Particle Geometry on Die Swell
  11. Reactive Processing
  12. Side Chain Extension of Maleated Polypropylene with Diamine
  13. Reactive Batch Mixing for Improved Silica-Silane Coupling
  14. Studies on NBR-ZDMA-OMMT Nanocomposites Prepared by Reactive Mixing Intercalation Method
  15. Fiber and Film
  16. High-speed Melt Spinning of Polyethylene terephthalate with Periodic Oscillation of Take-up Velocity
  17. A Constitutive Analysis of Extensional Flow of EVA Nanocomposites
  18. Laser Sintering
  19. Laser Sintering of High Temperature Resistant Polymers with Carbon Black Additives
  20. Molding
  21. Flow Visualization of Filling with Aid of Colored Billets During Impact Micro-Injection Molding
  22. Modelling of Cyclic 3-Dimensional Heat Transfer in Injection Moulding
  23. PPS News
  24. PPS News
https://doi.org/10.3139/217.1856

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Polymer Processing Society at 20
  5. Mixing and Screw Extrusion
  6. Index for Simultaneous Dispersive and Distributive Mixing Characterization in Processing Equipment
  7. Determination of the Residence Time Distribution in Twin Screw Extruders via Free Radical Modification of PE
  8. On-line Visualization of PS/PP Melting Mechanisms in a Co-rotating Twin Screw Extruder
  9. Die Extrusion
  10. Influence of Filler Particle Geometry on Die Swell
  11. Reactive Processing
  12. Side Chain Extension of Maleated Polypropylene with Diamine
  13. Reactive Batch Mixing for Improved Silica-Silane Coupling
  14. Studies on NBR-ZDMA-OMMT Nanocomposites Prepared by Reactive Mixing Intercalation Method
  15. Fiber and Film
  16. High-speed Melt Spinning of Polyethylene terephthalate with Periodic Oscillation of Take-up Velocity
  17. A Constitutive Analysis of Extensional Flow of EVA Nanocomposites
  18. Laser Sintering
  19. Laser Sintering of High Temperature Resistant Polymers with Carbon Black Additives
  20. Molding
  21. Flow Visualization of Filling with Aid of Colored Billets During Impact Micro-Injection Molding
  22. Modelling of Cyclic 3-Dimensional Heat Transfer in Injection Moulding
  23. PPS News
  24. PPS News
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