PET/EVA/PP ternary blends: An investigation of extended morphological properties

• Published in: Journal of applied polymer science Vol. 112; no. 3; pp. 1716 - 1728
• Main Authors: Abolhasani, Mohamad Mahdi, Azar, Ahmad Aref, Shokoohi, Shirin
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.05.2009
• Subjects: blend; core-shell polymers; morphology
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.29500

In this study, the effects of different parameters on the morphological properties of ternary blends were investigated. Therefore two systems (PET/H-EVA/PP and PET/L-EVA/PP, H-EVA and L-EVA are high and low viscosity, respectively) were prepared by melt mixing process. In all of the blends, poly (ethylene terephthalate) (PET) as the major phase- with poly propylene (PP) and two grades of poly (ethyl-stat-vinylacetate) (EVA) with different viscosities and subsequently different interfacial interactions was blended. Theoretical models predicted positive spreading coefficient for two grades of EVA and lower free energy for the samples consisting of EVA and PP as the shell and the core phases respectively. With changing core shell ratio, droplet size of samples containing L-EVA and H-EVA increased and decreased, respectively. Subinclusion of shell into the core was observed in some blended samples. In systems containing H-EVA, by thickening the shell phase; multi core morphology was observed which would be related to the coalescence phenomenon inter the droplets.