The effect of extrusion conditions and the use of a compatibilizer in the crystallization of PBT/ABS blends
| Autor: | Elias Hage Junior, Marcelo A. Chinelatto, Luiz Antonio Pessan, Harumi Otaguro, José Donato Ambrósio |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
EXTRUSÃO law.invention DSC chemistry.chemical_compound Crystallinity Differential scanning calorimetry law General Materials Science twin screw extrusion Crystallization Composite material PBT Materials of engineering and construction. Mechanics of materials Acrylate PBT/ABS blend Mechanical Engineering Enthalpy of fusion Compatibilization Epoxy Condensed Matter Physics melt-recrystallization chemistry Mechanics of Materials visual_art visual_art.visual_art_medium TA401-492 Extrusion double melting peak |
| Zdroj: | Materials Research, Vol 16, Iss 6, Pp 1220-1228 (2013) Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Materials Research v.16 n.6 2013 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Volume: 16, Issue: 6, Pages: 1220-1228, Published: 29 JUL 2013 |
| ISSN: | 1516-1439 |
| Popis: | Poly(butylene terephthalate) (PBT)/ acrylonitrile-butadiene-styrene (ABS) terpolymer blends were prepared in a twin screw extruder and the use of methyl methacrylate-glycidyl methacrylate-ethyl acrylate (MGE) terpolymer as compatibilization additive was evaluated. The effect of different screw profiles and mixing conditions were evaluated on the crystallization of the blends. Differential scanning calorimetry (DSC) was used to evaluate melting and crystallization behaviors of the PBT/ABS blends. The binary PBT/ABS blend has shown a double melting peak when cooled at lower cooling rates, mainly due to its melt-recrystallization during the heating up step. ABS has not affected the melting characteristics of neat PBT. The presence of MGE, as a reactive compatibilizer, in the PBT/ABS blends has reduced its heat of fusion and has partially inhibited its melt-recrystallization under heating. As result, it has prevented the occurrence of double melting peak. The epoxy functional groups of the MGE may react in situ to the carbonyls and hydroxyls end groups of the PBT molecules, thereby hindering the mobility of PBT molecules during the crystallization process due to its grafting to the compatibilizer molecules. The melt mixed blends prepared at lower feeding rate have shown a higher degree of crystallinity for the PBT/ABS blend, probably due to degradation of PBT caused by longer residence time in the extruder. The highest shear stress imposed to the blends at higher screw speed increased the degree of crystallinity of PBT, also due to its degradation. |
| Databáze: | OpenAIRE |
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