Image icon  Sheaf-like arrangement of lamellae in a blend of polyethylenes

 
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Description: A replica of a 3:1 blend of linear with lightly branched polyethylenes (BPE has 26 branched per 1000 backbone carbon atoms) after isothermal crystallisation at a temperature at which the LPE but not the BPE can crystallise. This sample crystallised from a phase separated melt. There are clearly two lamellar types (The isothermal crystallisation makes the distinction clearer). The thick, LPE rich, lamellae crystallised in sheaf-like groups, from LPE rich droplets contained in a BPE rich matrix. The sheaf-like arrangement is representative of one of the initial stages in spherulite formation.
Keywords: alignment • blend • polyethylene (PE) • polymer • quenching • spherulite
Categories: Science approaches > Microstructure
Materials > Polymers & elastomers > Plastics > Thermoplastics > Polyethylene (PE)
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Dr P J Barham, Polymer Physics Group, Bristol University
DoITPoMS, 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
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Resource ID: 1589