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Full Record for Micrograph 556

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Micrograph no
556
Brief description
Sheaf-like arrangement of lamellae in a blend of polyethylenes
Keywords
alignment, blend Link to MATTER Glossary entry for blend, polyethylene (PE), polymer Link to MATTER Glossary entry for polymer, quenching Link to MATTER Glossary entry for quenching, spherulite Link to MATTER Glossary entry for spherulite
Categories
Polymer
System
Polyethylene (PE)
Composition
LPE:BPE 3:1
Standard codes
Reaction
Processing
Blend (3:1) of linear and lightly branched polyethylenes. The blend was melted at 163 degrees C and then cooled to 126 degrees C for isothermal crystallisation
Applications
Polymer blends are commercially important materials. Blending very similar polymers can produce materials with improved properties.
Sample preparation
Technique
Transmission electron microscopy (TEM)
Length bar
200 nm
Further information
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.
Contributor
Dr P J Barham
Organisation
Polymer Physics Group, Bristol University
Date
03/10/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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