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Structure Development in Melt Spinning Syndiotactic Polypropylene and Comparison to Isotactic Polypropylene

  • D. Choi and J. L. White
Published/Copyright: June 6, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 15 Issue 4

Abstract

A basic investigation of the development of crystallization and orientation during the melt spinning of syndiotactic and isotactic polypropylene is described. Both polymers were melt spun through ambient air or into ice water at various draw-down ratios and melt temperatures. The melt spun filaments were characterized by wide angle x-ray diffraction (WAXD), birefringence and differential scanning calorimetry (DSC). The polymorphic behavior of isotactic polypropylene during melt spinning is well known. The filaments melt spun through ambient air exhibit the monoclinic α-form while the filaments melt spun into ice water form a smectic structure at low draw-down ratios. Syndiotactic polypropylene also exhibited polymorphic behavior during melt spinning. Disordered Form I with (t2g2)2 helices was found at low spinline stresses and Form III with all trans chain conformation was found at high spinline stresses. The criterion of the spinline stress for this transition was found to be about 6–9 MPa for all samples of various molecular weights, melt temperatures and cooling rates. Syndiotactic polypropylene crystallized much more slowly than isotactic polypropylene and did not exhibit a smectic mesomorphism under ice-water quenched conditions. The melt spun filaments of syndiotactic polypropylene exhibited lower birefringences and amorphous orientations but higher crystalline orientations than those of isotactic polypropylene, compared at the same spinline stresses.

* Mail address: Prof. Dr. J. L. White, Institute of Polymer Engineering, University of Akron, Akron, Ohio 44325, USA
Received: 2000-2-1
Accepted: 2000-7-1
Published Online: 2013-06-06
Published in Print: 2000-12-01

© 2000, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Editorial
  2. Seventh of a Series: Pioneer of Carbonaceous Pitch Processing Sugio Otani
  3. Invited Paper
  4. Injection Blow Molding Technology for Polyethylene Terephthalate
  5. Screw Extrusion/Mixing
  6. A New Polymer Processing Technology for Polymer Blends with Unmatched Viscosity: Solid-State Shear Pulverization (S3P)
  7. In-Line Density Monitoring of Rigid PVC Foam during Extrusion Process
  8. In-Process R eometry Studies of LDPE Compounds
  9. In-Process R eometry Studies of LDPE Compounds
  10. Rheological and Morphological Properties of Immiscible Blends and Microfiber Preparation from the Blends
  11. Reactive Extrusion
  12. Development of a Direct Polycondensation Process for Poly (L-lactic acid)
  13. Fiber and Film
  14. Radially Dependent Stress and Modeling of Solidi cation in ilament Melt Spinning
  15. Structure Development in Melt Spinning Syndiotactic Polypropylene and Comparison to Isotactic Polypropylene
  16. Fibers and Films
  17. Investigation of Structure and Properties in Biaxially Stretched Poly(butylene terephthalate) Films
  18. Molding
  19. Filling and Postfilling Analysis of Injection/Compression Molding
https://doi.org/10.3139/217.1608

Articles in the same Issue

  1. Editorial
  2. Seventh of a Series: Pioneer of Carbonaceous Pitch Processing Sugio Otani
  3. Invited Paper
  4. Injection Blow Molding Technology for Polyethylene Terephthalate
  5. Screw Extrusion/Mixing
  6. A New Polymer Processing Technology for Polymer Blends with Unmatched Viscosity: Solid-State Shear Pulverization (S3P)
  7. In-Line Density Monitoring of Rigid PVC Foam during Extrusion Process
  8. In-Process R eometry Studies of LDPE Compounds
  9. In-Process R eometry Studies of LDPE Compounds
  10. Rheological and Morphological Properties of Immiscible Blends and Microfiber Preparation from the Blends
  11. Reactive Extrusion
  12. Development of a Direct Polycondensation Process for Poly (L-lactic acid)
  13. Fiber and Film
  14. Radially Dependent Stress and Modeling of Solidi cation in ilament Melt Spinning
  15. Structure Development in Melt Spinning Syndiotactic Polypropylene and Comparison to Isotactic Polypropylene
  16. Fibers and Films
  17. Investigation of Structure and Properties in Biaxially Stretched Poly(butylene terephthalate) Films
  18. Molding
  19. Filling and Postfilling Analysis of Injection/Compression Molding
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