On the viscosity‐concentration dependence of immiscible polymer blends

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1122/1.550248
Author	Search for: Utracki, L. A.¹
Affiliation	National Research Council Canada. NRC Industrial Materials Institute
Format	Text, Article
Abstract	Upon addition of small quantities of a second phase the mixture shows a droplet/matrix structure, changing into a co‐continuous one at the percolation threshold, φc≂0.16. The level of phase co‐continuity reaches a maximum at the phase inversion concentration, φ2I, where the viscosities of a system in which polymer‐1 is dispersed in polymer‐2 and the other where polymer‐2 is dispersed in polymer‐1 are equal. Thus φ1I can be expressed as function of viscosity ratio, λ=η1/η2, with intrinsic viscosity and maximum packing volume fraction as parameters. Next, it was postulated that in immiscible polymer blends the viscosity‐concentration dependence is determined by two mechanisms: an interlayer slip and the emulsionlike viscosity increase culminating at the inversion concentration, φ2I. The derived two‐parameter equation was found to describe the observed η versus φ dependence quite well. The parameters, calculated from the least‐squares regression fit of experimental data to the two‐parameter equation, were found to provide insight into the flow mechanism
Publication date	1991-07-01
Publisher	The Society of Rheology / AIP
In	Journal of Rheology 35, no. 8: 1615–1637.
Language	English
Peer reviewed	Yes
NRC number	CNRC 32639 NRC-IMI91AP-34004-1113-G
NPARC number	23004514
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Record identifier	3257e924-83cd-4bdb-99e4-b79d547eab34
Record created	2018-11-13
Record modified	2020-03-17

Date modified:: 2026-01-20