Deformation of melts of mixtures of incompatible polymers in a uniform shear field and the process of their fibrillation

Autor:	G. V. Vinogradov, Z. Pelzbauer, E. P. Plotnikova, M. P. Zabugina, N. P. Krasnikova, V. E. Dreval, E. V. Kotova
Rok vydání:	1983
Předmět:	chemistry.chemical_classification Materials science macromolecular substances Polymer Pure shear Polyethylene Condensed Matter Physics Simple shear Shear modulus Shear rate chemistry.chemical_compound chemistry Shear stress General Materials Science Polymer blend Composite material
Zdroj:	Rheologica Acta. 22:102-107
ISSN:	1435-1528 0035-4511
DOI:	10.1007/bf01679834
Popis:	Fibril formation in mixtures of incompatible polymers, in this case polyethylene and polystyrene, has been studied with their melt being deformed in a uniform shear field. It has been found that when polyethylene is present in a smaller amount, it may form very long fibrils 5 to 8 µm in diameter in the deformed mixture. The formation of such fibrils is determined by the relationship between the viscosity ratio of the mixture components and shear stress. Also, just as in the case of a nonuniform shear field in a flow through a duct, fibril formation in melts of mixtures of incompatible polymers in a uniform shear field takes place upon reaching a certain shear stress. The lower the ratio between the viscosities of the fibril-forming polymer and the other component, the lower this shear stress.
Databáze:	OpenAIRE
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