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Structure-Properties Relations for Polyamide 6, Part 2: Influence of Processing Conditions during Injection Moulding

Emanuele Parodi1,2, Gerrit W M Peters3, Leon E Govaert4

  • 1Department of Mechanical Engineering, Materials Technology Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands. Emanuele.parodi@maxxistce.nl.

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|April 10, 2019
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Summary
This summary is machine-generated.

Injection molding conditions significantly impact polyamide 6 properties. Higher mold temperatures yield more stable structures, while lower temperatures result in complex changes during mechanical testing.

Keywords:
humidityinjection moldingmechanical propertiespolyamide 6polymorphism

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Injection molding is a key process for polymer part manufacturing.
  • Understanding structure-property relationships in polyamide 6 is crucial for material design.

Purpose of the Study:

  • Investigate the influence of injection molding processing conditions on polyamide 6 structure and mechanical properties.
  • Analyze the effects of mold temperature, pressure, and shear flow on material behavior.
  • Study yield and failure kinetics under varying environmental conditions.

Main Methods:

  • Injection molding of polyamide 6 samples.
  • Tensile and creep tests at different temperatures and relative humidities.
  • Analysis of crystallographic properties and semi-empirical modeling.

Main Results:

  • Mold temperature significantly affects crystallographic properties.
  • Temperature and relative humidity strongly influence yield stress and time-to-failure.
  • Samples molded at high temperatures exhibit greater stability against environmental changes.

Conclusions:

  • Processing conditions, particularly mold temperature, critically control polyamide 6 morphology and stability.
  • A semi-empirical model successfully describes yield and failure kinetics, correlating them with crystalline phases.
  • Low mold temperatures lead to complex structural evolutions under mechanical testing, complicating property prediction.