Effect of processing parameters on the mechanical properties of in situ compatibilized polybutylene terephthalate/acrylonitrile-butadiene-styrene blends
| Autor: | José Donato Ambrósio, Elias Hage Junior |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Acrylate
Materials science Polymers and Plastics Acrylonitrile butadiene styrene Izod impact strength test General Chemistry Surfaces Coatings and Films chemistry.chemical_compound Polybutylene terephthalate Crystallinity chemistry Ultimate tensile strength Materials Chemistry Extrusion Composite material Acrylonitrile |
| Zdroj: | Journal of Applied Polymer Science. 124:2753-2765 |
| ISSN: | 0021-8995 |
| DOI: | 10.1002/app.35205 |
| Popis: | To evaluate mechanical properties of blends prepared by intermeshing corotating twin-screw extrusion (ICTSE), it is usually necessary to injection mold specimens after the extrusion mixing process. At this study an alternative method is used to obtain testing specimens from ribbons extruded polybutylene terephthalate/acrylonitrile–butadiene–styrene blends, (PBT/ABS), compatibilized with methyl methacrylate–glycidyl methacrylate-ethyl acrylate (MGE) by ICTSE, and then to correlate their mechanical properties with the processing parameters. Regarding to the extrusion process parameters, it has been noted that higher feed rates, lower screw speeds and narrower kneading blocks have reduced the ductile-brittle transition temperature (DBTT) of the compatibilized PBT/ABS blends, thereby suggesting that the molecule integrity of blend polymeric components has been preserved and that a good dispersion of the ABS domains in the PBT matrix has been achieved. Injection molded PBT/ABS blends were obtained to compare to the extruded ribbons. The mechanical tests for both specimens have shown the same trends. The injection molded samples have presented poorer impact strength, tensile strain at break and tensile strength, when compared to the respective extruded samples. That behavior has been attributed to the high level of molecular orientation resulting from the injection molding process and mainly to PBT degradation during process. The PBT degradation could have increased its degree of crystallinity, which has been confirmed by DSC measurements. As result, the blend became more brittle, decreasing its Izod impact strength. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
| Databáze: | OpenAIRE |
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