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Preparation and Characterization of HMW PA 6 via Anionic Polymerization of ∊-Caprolactam by Using a Mixture of Di- and Tri-functional Chain Initiators

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Published/Copyright: March 26, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 21 Issue 3

Abstract

In the present work, an attempt was made to synthesis polyamide 6 through anionic polymerization of e-Caprolactam by using a mixture of Diphenylmethan 4, 4-di and tri-isocyanate as a chain initiator and sodium caprolactamate as a catalyst. Polymerization was carried out in a laboratory internal mixer (Brabender). The rotor speed, reaction temperature and reaction time were among the processing variables studied. The prepared samples were characterized by Thermogravimetry Analysis (TGA), Differential Scanning Calorimeter (DSC) and FT-IR spectroscopy. The flow behavior and melt viscoelastic properties of the samples were studied by using a Rheometric Mechanical Spectrometer (RMS). The polymerization reaction was found to be very fast and was completed within 6 minutes. This was detected by following the mixing torque which reached to a steady state after passing through a maximum. The pronounced decrease in the torque was found to be determine by the thermomechanical degradation as a predominating mechanism. The polyamide 6 prepared in this work showed greater melt elasticity, much higher molecular weight and slightly narrower molecular weight distribution in comparison with the commercial grades of polyamide 6. The crystallinity of the samples was also higher than that of the commercial polyamide 6. These results were explained in terms of contribution of fraction of the molecules possessing single long chain branch formed as a result of three functional nature of the chain initiator. Increasing the rotor speed was found to have strong influence on lowering molecular weight as well as narrowing the molecular weight distribution through increasing the extent of thermomechanical degradation. Increasing the initial set temperature in the studied range had no appreciable effect on polymerization rate and degree of conversion. It was demonstrated that the results of melt viscoelastic measurements performed on the samples collected at different polymerization times can provide valuable information to follow the polymerization reaction.

∗ Mail address: H. Assempour, Dept. of Polymer Engineering, Amir Kabir University of Technology, Hafez, Ave. No. 424, P.O. Box 15875-4413, Tehran, Iran. E-mail:

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Received: 2005-05-18
Accepted: 2006-01-10
Published Online: 2013-03-26
Published in Print: 2006-07-01

© 2006, Hanser Publishers, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. New Multicomponent Compatibilization System for Polyolefin/Polystyrene Blends
  5. Preparation and Characterization of HMW PA 6 via Anionic Polymerization of ∊-Caprolactam by Using a Mixture of Di- and Tri-functional Chain Initiators
  6. Polymer Processing Extrusion Instabilities and Methods for their Elimination or Minimisation
  7. Microcellular Wood Fibre Reinforced PP Composites
  8. Effects of Take-up Speed of Melt Spinning on the Structure and Mechanical Propertiesof Maximally Laser Drawn PA9-T Fibers
  9. Description of the Pressure/Throughput Behavior of a Single-screw Plasticating Unit in Consideration of Wall Slippage Effects for Non-Newtonian Material and 1-D flow
  10. Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation
  11. Analysis of the Residual Stresses in the Process of Nanoimprint Lithography
  12. The Reactive Extrusion of Thermoplastic Polyurethane and the Effect of the Depolymerization Reaction
  13. Simulation of Core Deflection in Powder Injection Molding
  14. Experimental Investigation of the Cooling Flow in the Film Blowing Process
  15. Study of the Compatibilizer Effect on Blends Prepared from Waste Poly(ethylene-terephthalate) and High Density Polyethylene
  16. PPS News
  17. PPS News
  18. Seikei-Kakou Abstracts
  19. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.0074

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. New Multicomponent Compatibilization System for Polyolefin/Polystyrene Blends
  5. Preparation and Characterization of HMW PA 6 via Anionic Polymerization of ∊-Caprolactam by Using a Mixture of Di- and Tri-functional Chain Initiators
  6. Polymer Processing Extrusion Instabilities and Methods for their Elimination or Minimisation
  7. Microcellular Wood Fibre Reinforced PP Composites
  8. Effects of Take-up Speed of Melt Spinning on the Structure and Mechanical Propertiesof Maximally Laser Drawn PA9-T Fibers
  9. Description of the Pressure/Throughput Behavior of a Single-screw Plasticating Unit in Consideration of Wall Slippage Effects for Non-Newtonian Material and 1-D flow
  10. Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation
  11. Analysis of the Residual Stresses in the Process of Nanoimprint Lithography
  12. The Reactive Extrusion of Thermoplastic Polyurethane and the Effect of the Depolymerization Reaction
  13. Simulation of Core Deflection in Powder Injection Molding
  14. Experimental Investigation of the Cooling Flow in the Film Blowing Process
  15. Study of the Compatibilizer Effect on Blends Prepared from Waste Poly(ethylene-terephthalate) and High Density Polyethylene
  16. PPS News
  17. PPS News
  18. Seikei-Kakou Abstracts
  19. Seikei-Kakou Abstracts
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