Image icon  Crystalline structure of aramid fibre.

 
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Description: This is a schematic image of aramid fibres crystalline structure with 100 % degree of crystallisation. The fundamental unit of structure formed by crystalline polymers which is accessible using the optical microscope is the spherulite. Isolated spherulites are formed easily at relatively slow spherulite growth rates such as those exhibited by polypropylene and isotactic polystyrene. Unlike aramid fibres, most crystalline polymers contain significant amounts of amorphous polymer either between spherulites or present at crystallite boundaries within individual spherulites.
Keywords: ductile fracture • brittle fracture • plastic deformation • micrograph
Categories: Science approaches > Structure, bonding & defects > Crystal structure
Materials > Polymers & elastomers
Materials > Polymers & elastomers > Plastics
Created by: The Open University
Published by: The Open University
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Date created: 09 March 1998
Date added: 14 December 2010
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Resource ID: 3293