Stress Relaxation Profiles of Molded and Extruded Thermoplastics Using Dynamic Mechanical Analysis

The stress relaxation profiles across the skin-core-skin layers of injection molded polycarbonate and extruded polyethylene sheet are presented. The profiles were obtained by progressively removing the layers followed by stress relaxation tests using a Dynamic Mechanical Analyzer (DMA). The machined...

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Bibliographic Details
Published in:Journal of reinforced plastics and composites 2001-01, Vol.20 (13), p.1100-1111
Main Authors: Lee-Sullivan, Pearl, Dykeman, Donna
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Injection moulding
Machinery and processing
Moulding
Plastics
Polymer industry, paints, wood
Technology of polymers
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Summary:The stress relaxation profiles across the skin-core-skin layers of injection molded polycarbonate and extruded polyethylene sheet are presented. The profiles were obtained by progressively removing the layers followed by stress relaxation tests using a Dynamic Mechanical Analyzer (DMA). The machined layers were characterized using the elastic modulus, Eo , and the relaxation time, o. It was found that the DMA was able to distinguish the differences in viscoelastic response across the thickness of the polymer samples. The variation in behaviour was consistent with the expected morphology and molecular orientation developed due to the processing method.
ISSN:0731-6844
1530-7964
DOI:10.1106/AYPX-7ENB-YFWM-AQ2K