Rheological behavior and morphological and interfacial properties of PLA/TPE blends

• Autor(a) principal: Bernardes, Giordano Pierozan
• Data de Publicação: 2019
• Outros Autores: Luiz, Nathalia da Rosa, Santana, Ruth Marlene Campomanes, Forte, Maria Madalena de Camargo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/219646
• topic: Blendas; Poli(ácido lático); Elastômeros termoplásticos; Propriedades dos materiais; Compatibilization; Mechanical properties; PLA; Thermal properties; TPE

Rheological and interfacial tension data were employed to predict the morphology and thermal and mechanical properties ofnoncompatibilized and compatibilized poly(lactic acid) (PLA)/thermoplastic elastomer (TPE) blends. PLA was melt blended with thermo-plastic polyurethane (TPU) and ethylene elastomer (EE) and compatibilized by ethylene–butyl acrylate–glycidyl methacrylate (EBG) in aninternal mixer chamber. Both TPU and EE TPEs have higher viscosities than PLA, and the interfacial properties evaluated have revealedbetter adhesion between domains of PLA–TPU. The efficiency of the compatibilizer agent EBG depended on the TPE type inferred bymodifications in the scanning electron microscopy images of PLA/TPE blends and by the Izod impact strength (improved by 23%). TheEBG was more effective in the PLA/TPU blend. The TPEs and EBG did not affect the PLA thermal stability, and no thermal event wasobserved in the usual PLA extrusion and injection temperature range.