Image icon  Injection-moulded polypropylene (PP) hinge

 
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Resource type: Image
Description: The colours in the image are the result of birefringence and relate to the residual strain in the polypropylene. The pattern of strain is indicative of the flow of material during the injection process and reveals the molecular alignment in the constriction which constitutes a hinge. The aligned molecules provide a fatigue resistant, flexible joint. A sprue which has been cut off is also visible in the top left-hand corner of the image.
Keywords: alignment • birefringence • hinge • injection moulding • polymer • polypropylene (PP)
Categories: Science approaches > Deformation & failure > Fatigue
Science approaches > Microstructure
Materials > Polymers & elastomers > Plastics > Thermoplastics > Polypropylene (PP)
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
J A Curran, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 03 October 2002
Date added: 21 August 2009
Package:
Resource ID: 1610