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Flow-Induced Crystallization and Self-Reinforcement During Extrusion

  • A. J. McHugh , D. A. Tree , B. Pornnimit and G. W. Ehrenstein
Published/Copyright: May 27, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 6 Issue 3

Abstract

Flow-induced crystallization of high-density polyethylene and polypropylene films has been studied in a slit die equipped with optical windows to allow direct visual observation of the process. Mechanical and thermal property measurements and morphological analyses verify the presence of self-reinforced, extended-chain structures in the extrudate. By controlling the location of the crystallization front inside the die but near the exit, continuous extrusion was possible at lower pressures than previously reported. Birefringence measurements of the melt flow indicated the feasibility of an optimal die geometry to maximize oriented structure development during continuous extrusion while minimizing pressure buildup.

* Mail address: Dr. A. J. McHugh, Dept. of Chemical Engineering, University of Illinois, Urbana, Illinois, U.S.A.
Received: 1990-7-5
Accepted: 1990-8-23
Published Online: 2013-05-27
Published in Print: 1991-09-01

© 1991, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Die Extrusion
  4. Finite Element Analysis of Polymer Melt Flow in Profile Extrusion Coating Die
  5. Simultaneous Diameter and Thickness Control in Tube Extrusion
  6. A Stick-Slip Problem Related to Melt Fracture in Polymer Processing Operations
  7. Effects of Plasticizers on Extrusion of Dry Blended PVC
  8. Flow-Induced Crystallization and Self-Reinforcement During Extrusion
  9. Molding
  10. A Fundamental Experimental Study of the Mechanisms of Warpage and Shrinkage of Polyethylene in Rotational Molding
  11. Closed Loop Control of Parison Dimension Profiles in Extrusion Blow Molding
  12. Liquid Crystal Polyesters
  13. Effect of Thermal History on Viscoelastic Properties of Thermotropic Liquid Crystalline Copolyesters
  14. Molecular Orientation and Modulus of a Thermotropic Liquid Crystalline Copolyester
  15. Production and Characterization of Fine-dispersed Mixtures of Liquid Crystalline with Conventional Polymers
  16. Processing and Properties of Polycarbonate/Liquid Crystal Polymer Blends
  17. Rapid Communication of Recent Advances
  18. Generation of Corners in Profile Extrusion**
  19. Coextruded Infrared Reflecting Films
https://doi.org/10.3139/217.910208

Articles in the same Issue

  1. Contents
  2. Contents
  3. Die Extrusion
  4. Finite Element Analysis of Polymer Melt Flow in Profile Extrusion Coating Die
  5. Simultaneous Diameter and Thickness Control in Tube Extrusion
  6. A Stick-Slip Problem Related to Melt Fracture in Polymer Processing Operations
  7. Effects of Plasticizers on Extrusion of Dry Blended PVC
  8. Flow-Induced Crystallization and Self-Reinforcement During Extrusion
  9. Molding
  10. A Fundamental Experimental Study of the Mechanisms of Warpage and Shrinkage of Polyethylene in Rotational Molding
  11. Closed Loop Control of Parison Dimension Profiles in Extrusion Blow Molding
  12. Liquid Crystal Polyesters
  13. Effect of Thermal History on Viscoelastic Properties of Thermotropic Liquid Crystalline Copolyesters
  14. Molecular Orientation and Modulus of a Thermotropic Liquid Crystalline Copolyester
  15. Production and Characterization of Fine-dispersed Mixtures of Liquid Crystalline with Conventional Polymers
  16. Processing and Properties of Polycarbonate/Liquid Crystal Polymer Blends
  17. Rapid Communication of Recent Advances
  18. Generation of Corners in Profile Extrusion**
  19. Coextruded Infrared Reflecting Films
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