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Injection Moulding and Mechanical Properties of Recovered Polypropylene

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Published/Copyright: April 30, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 20 Issue 3

Abstract

This work is a part of a study aiming at assessing the processability of recovered polypropylene in relation to the mechanical and aesthetic performance of as-manufactured and heat aged mouldings. The effects of processing and heat ageing on the mechanical properties of injection-moulded recovered polypropylene were studied here. A similar grade of virgin polypropylene was used as a reference. Multipurpose test specimens were manufactured with a two-cavity mould, according to decoupled moulding procedures. The mouldings were aged at 100°C for 170 h and 340 h. The stiffness, the strength, the elongation at break and the Charpy impact resistance of as-moulded and heat-treated materials were investigated. The results show that the recovered polypropylene could be processed as the analogous virgin grade. Insignificant changes in the measured properties due to the different filling conditions were observed for each polypropylene used. The stiffness and strength of the recycled polypropylene was systematically 20% lower than that of the analogous virgin grade, whereas the impact resistance of the recycled grade was on average 40% higher than that for the virgin grade. There was no significant difference in the elongation at break of the two materials. After the short ageing period, an increase in stiffness and strength of the materials was observed, together with a sharp decrease in the elongation at break and a modest increase in the impact resistance. This was related to re-crystallisation. The long ageing period reduced the stiffness and strength of the materials but there was no significant change in the elongation at break or in the impact resistance.

∗ Mail address: A. Boldizar, Chalmers University of Technology, Department of Materials Science and Engineering, SE-41296 Göteborg, Sweden E-mail:

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Received: 2004-6-9
Accepted: 2005-3-29
Published Online: 2013-04-30
Published in Print: 2005-09-01

© 2005, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Assessment of the Degree of Mixedness of Filled Polymers
  5. Screw Extrusion
  6. Numerical Analysis of Rubber Moulding Using Finite Element Modelling
  7. Regular Contributed Articles
  8. Experimental Study on the Filling of a Micro Injection Molding with Cylindrical Dot Patterns
  9. The Gloss of Injection-Moulded Recovered Polypropylene
  10. Injection Moulding and Mechanical Properties of Recovered Polypropylene
  11. Advanced Finite Element 3D Injection Molding
  12. Using Multi-Objective Evolutionary Algorithms to Optimize Mechanical Properties of Injection Molded Parts
  13. On PVT and Rheological Measurements of Polymer Melts
  14. External Calibration in PA12 Tube Extrusion
  15. Screw Extrusion
  16. External Calibration in PA12 Tube Extrusion
  17. Regular Contributed Articles
  18. Two Dimensional Description of Pressure-Throughput Behaviour of Newtonian Materials Considering Wall Slippage Effects
  19. Experimental Studies and Modeling of Development of Dispersion and Fiber Damage in Continuous Compounding
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.1887

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Assessment of the Degree of Mixedness of Filled Polymers
  5. Screw Extrusion
  6. Numerical Analysis of Rubber Moulding Using Finite Element Modelling
  7. Regular Contributed Articles
  8. Experimental Study on the Filling of a Micro Injection Molding with Cylindrical Dot Patterns
  9. The Gloss of Injection-Moulded Recovered Polypropylene
  10. Injection Moulding and Mechanical Properties of Recovered Polypropylene
  11. Advanced Finite Element 3D Injection Molding
  12. Using Multi-Objective Evolutionary Algorithms to Optimize Mechanical Properties of Injection Molded Parts
  13. On PVT and Rheological Measurements of Polymer Melts
  14. External Calibration in PA12 Tube Extrusion
  15. Screw Extrusion
  16. External Calibration in PA12 Tube Extrusion
  17. Regular Contributed Articles
  18. Two Dimensional Description of Pressure-Throughput Behaviour of Newtonian Materials Considering Wall Slippage Effects
  19. Experimental Studies and Modeling of Development of Dispersion and Fiber Damage in Continuous Compounding
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
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