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Effects of Sparse Long Chain Branching on the Spinning Stability of LLDPEs

  • M. J. Bortner , P. J. Doerpinghaus and D. G. Baird
Published/Copyright: May 2, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 19 Issue 3

Abstract

The influence of sparse long chain branching on the onset and propagation of isothermal draw resonance in fiber spinning of polyethylene melts was investigated. Six polyethylene melts were used in this study: three sparsely branched metallocene polyethylenes, a linear low-density metallocene polyethylene, a conventional linear low-density polyethylene, and a conventional low-density polyethylene (LDPE). The sparsely branched metallocene polyethylenes have almost identical shear rheology and molecular weight distributions, but strain harden to different extents under extensional deformation because of slight differences in the amount of sparse long chain branching. Critical draw ratios and the ratios of minimum to maximum diameter were found to be different for each of these polyethylenes. The two linear low-density polyethylenes, which have no long chain branching, had critical draw ratios similar to those of the sparsely branched polyethylenes, but failed (necked to the point of filament breakage) during monofilament extrusion at draw ratios significantly lower than those measured for the sparsely branched polyethylenes. In contrast, the LDPE, which has the highest degree of branching and largest molecular weight distribution, had a much higher critical draw ratio than that obtained for the other five polyethylenes. These results suggest that the degree of extensional strain hardening, arising from differences in long chain branching, has a significant effect on the onset and propagation of draw resonance in isothermal fiber spinning. In the case of LLDPE, broadening the MWD seemed to affect the drawability of LLDPE, but had no effect on the critical draw ratio.

∗ Mail address: D. G. Baird, Dept. of Chem. Eng., Virgina Polytechnic Institute and State University, 128 Randolph Hall, Blacksburg, VA 24061-0211, USA E-mail:

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Received: 2003-12-8
Accepted: 2004-3-11
Published Online: 2013-05-02
Published in Print: 2004-09-01

© 2004, Carl Hanser Verlag, Munich

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  2. Contents
  3. Editorial
  4. Polymer Processing Society Annual Meeting 21
  5. Screw Extrusion
  6. Parametric Study of the Mixing Efficiency in a Kneading Block Section of a Twin-screw Extruder
  7. Experiments on Characteristic Deformation and Breakup Behaviors of an Immiscible Drop in a Screw Channel Flow
  8. Die Extrusion
  9. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  10. Fiber
  11. Effects of Sparse Long Chain Branching on the Spinning Stability of LLDPEs
  12. Dry Spinning of Polymer Fibers in Ternary Systems
  13. Dry Spinning of Polymer Fibers in Ternary Systems
  14. Studies on Methacrylate-hydroethyl Methacrylate Oil-absorptive Fiber
  15. Film
  16. Numerical and Physical Modeling of Polymer Crystallization
  17. Numerical and Physical Modeling of Polymer Crystallization
  18. Modeling
  19. Study on Viscoelastic Behavior and Extrusion Blow Molding Processability of PP/PE Blends
  20. Simulation of Thermal Phenomena on the Interface Molten Polymer/Powder Polymer During Rotational Molding
  21. Effect of Mold Temperature on Structure and Property Variations of PBT Injection Moldings in the Thickness Direction
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  23. Predicting the Long-term Creep Behavior of Plastics Using the Short-term Creep Test
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https://doi.org/10.3139/217.1824

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Polymer Processing Society Annual Meeting 21
  5. Screw Extrusion
  6. Parametric Study of the Mixing Efficiency in a Kneading Block Section of a Twin-screw Extruder
  7. Experiments on Characteristic Deformation and Breakup Behaviors of an Immiscible Drop in a Screw Channel Flow
  8. Die Extrusion
  9. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  10. Fiber
  11. Effects of Sparse Long Chain Branching on the Spinning Stability of LLDPEs
  12. Dry Spinning of Polymer Fibers in Ternary Systems
  13. Dry Spinning of Polymer Fibers in Ternary Systems
  14. Studies on Methacrylate-hydroethyl Methacrylate Oil-absorptive Fiber
  15. Film
  16. Numerical and Physical Modeling of Polymer Crystallization
  17. Numerical and Physical Modeling of Polymer Crystallization
  18. Modeling
  19. Study on Viscoelastic Behavior and Extrusion Blow Molding Processability of PP/PE Blends
  20. Simulation of Thermal Phenomena on the Interface Molten Polymer/Powder Polymer During Rotational Molding
  21. Effect of Mold Temperature on Structure and Property Variations of PBT Injection Moldings in the Thickness Direction
  22. Tensile and Flexural Properties of β-Nucleated Polypropylenes
  23. Predicting the Long-term Creep Behavior of Plastics Using the Short-term Creep Test
  24. PPS News
  25. PPS News
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