Effects of Composition and Processing Conditions on Morphology and Properties of Thermoplastic Elastomer Blends of SEBS-PP-Oil and Dynamically Vulcanized EPDM-PP-Oil

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Sengupta, P. and Noordermeer, J.W.M. (2004) Effects of Composition and Processing Conditions on Morphology and Properties of Thermoplastic Elastomer Blends of SEBS-PP-Oil and Dynamically Vulcanized EPDM-PP-Oil. Journal of Elastomers and Plastics, 36 (4). pp. 307-331. ISSN 0095-2443

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Abstract:This work presents a comparative study of the morphology and structure-related properties of thermoplastic elastomer blends based on SEBS-PP-oil and dynamically vulcanized EPDM-PP-oil prepared under identical conditions. Compositions of each blend type with three different SEBS-PP and EPDM-PP ratios by weight were made in a co-rotating twin-screw extruder and a Brabender internal mixer. A comparative study of different electron microscopic techniques for studying the morphology of these oil-extended blends is reported. Morphological characterization using different microscopic techniques showed a co-continuous morphology for the SEBS-PP-oil blends and droplet-matrix morphology for the thermoplastic vulcanizate (TPV) blends. The particle size distribution of the EPDM-phases in the TPVs prepared in the twin-screw extruder was wider than for the Brabender mixer. No difference in the morphology was observed for the SEBS-PP-oil blends prepared in the twin-screw extruder and Brabender, except for the blend with the highest PP content. The elongation-at-break values were significantly higher for the SEBS-PP-oil blends as compared to the TPV blends. The gel content of the TPVs was the main factor determining the stress-strain properties, as influenced by the preparation method. Also the crystallinity of the PP-phase for both SEBS-PP-oil and TPV blends was investigated and, although being dependent on the preparation method for the SEBS-PP-oil blends, did not reflect in the stress-strain properties.
Item Type:Article
Copyright:© 2004 Sage
Faculty:
Engineering Technology (CTW)
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Link to this item:http://purl.utwente.nl/publications/60140
Official URL:http://dx.doi.org/10.1177/0095244304042668
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