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Structure and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylene

Part 2 Effect of MFI of Base Resin
  • M. Fujiyama
Published/Copyright: May 28, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 10 Issue 3

Abstract

Isotactic polypropylene (PP) with MFIs of 0.43 to 44.5 g/10 min were added with 0 to 10 ppm of γ-quinacridone, a β-crystal nucleator of PP. Flexural test specimens were injection-molded from the PPs at constant molding conditions and the structures and properties have been studied. 1) The crystallization temperature increases with γ-quinacridone content and MFI of the base resin. 2) The β-crystal content increases with γ-quinacridone content and MFI. 3) The thickness of the skin layer decreases with MFI and scarcely depends on γ-quinacridone content. 4) The orientation of β-crystals decreases with MFI. 5) The Izod impact strength increases with γ-quinacridone content for PP with MFI < 40 g/10 min, and decreases with MFI. However, little improving effect of γ-quinacridone is observed for MFI > 40 g/10 min. 6) The flexural modulus and strength decreased by about 10 to 20 % by the addition of γ-quinacri-done and the decrease is more significant for PP with higher MFI. 7) The heat distortion temperature increases with γ-quinacridone content and the increase becomes more prominent with increasing MFI. 8) The mold shrinkage increases with γ-quinacridone content and decreases with MFI.

Mail address: Dr. M. Fujiyama, Plastics Research Laboratory, Tokuyama Corp., Tokuyama-shi, Yamaguchi-ken 745, Japan.
Received: 1994-9-7
Accepted: 1995-1-28
Published Online: 2013-05-28
Published in Print: 1995-09-01

© 1995, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fifteenth in a Series: Ikegai Corporation: From Engine Lathes to Twin Screw Extruders
  5. Die Extrusion
  6. Analysis of Polymer Flow through Coathanger Melt Distributors
  7. Viscosity and the Formation of Die Drool at the Polymer-Metal Interfaces
  8. Flow Implications in the Processing of Tetrafluoroethylene/Hexafluoropropylene Copolymers
  9. Reactive Processing
  10. Thermal/Peroxide Induced Degradation and Maleation of Polypropylene by Reactive Extrusion
  11. Fibers and Films
  12. Biaxially Oriented Polyethylene Films by Compression of Injection Moldings
  13. Tubular Film Blowing
  14. Tubular Film Blowing
  15. Molding
  16. Elastic Calculation of Residual Stresses in Injection Molding
  17. On the Limitations of Shear Induced Crystallization in Polypropylene Melts
  18. Structure and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylene
  19. Study on the Performance of Cooling Systems in Precision Injection Molds
  20. Measurement of Planar Orientation of Fibers for Reinforced Thermoplastics Using Image Processing
  21. Welding
  22. Dynamics and Structure Development in Spin Welding of Polyvinylidene Fluoride Cylindrical Rods
https://doi.org/10.3139/217.950251

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fifteenth in a Series: Ikegai Corporation: From Engine Lathes to Twin Screw Extruders
  5. Die Extrusion
  6. Analysis of Polymer Flow through Coathanger Melt Distributors
  7. Viscosity and the Formation of Die Drool at the Polymer-Metal Interfaces
  8. Flow Implications in the Processing of Tetrafluoroethylene/Hexafluoropropylene Copolymers
  9. Reactive Processing
  10. Thermal/Peroxide Induced Degradation and Maleation of Polypropylene by Reactive Extrusion
  11. Fibers and Films
  12. Biaxially Oriented Polyethylene Films by Compression of Injection Moldings
  13. Tubular Film Blowing
  14. Tubular Film Blowing
  15. Molding
  16. Elastic Calculation of Residual Stresses in Injection Molding
  17. On the Limitations of Shear Induced Crystallization in Polypropylene Melts
  18. Structure and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylene
  19. Study on the Performance of Cooling Systems in Precision Injection Molds
  20. Measurement of Planar Orientation of Fibers for Reinforced Thermoplastics Using Image Processing
  21. Welding
  22. Dynamics and Structure Development in Spin Welding of Polyvinylidene Fluoride Cylindrical Rods
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