Exploring interfacial tension role in the laminar morphology development in reactive compatibilized PP/EVOH

Autor(es)

Staffa, Lucas H. ; Veroneze, Isabelly B. ; Cruz, Sandra A.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Research; v. N/A, p. 12-pg., 2024-10-07.

Resumo

Laminar-like structures in PP/EVOH (80/20 wt%) blends were developed by in situ reactive compatibilization using a co-rotating intermeshing twin-screw extrusion without the imposition of post-die-forming elongation flows, i.e., draw ratio (DR) = 0. For that, a maleic anhydride-grafted homopolymer polypropylene (PP-g-MA) was added at 1, 1.5, and 3 wt% using a simple mixing protocol. The correlation between the laminar morphology observed via SEM with interfacial parameters was conducted by nonlinear regression of PP/EVOH viscoelastic response (G ' and G '') applying the Monomodal Palierne Model to estimate interfacial tension. Uncompatibilized PP/EVOH formed a droplet-matrix morphology with high interfacial tension, indicating incompatibility. As PP-g-MA is added, a laminar-like structure is developed. The remaining droplets become smaller at higher content, with lower interfacial tension between the phases. This scenario hampers the stratification of the dispersed phase. At 3 wt% of PP-g-MA, the morphology returns to being a droplet-matrix, although with high adhesion between the phases. (AU)

• Processo FAPESP: 23/05519-6 - Regeneração de blendas poliméricas de PP/EVOH por ação catalítica com aditivos organometálicos
• Beneficiário: Lucas Henrique Staffa
• Modalidade de apoio: Auxílio à Pesquisa - Regular