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Rheology of high density glass of binary colloidal mixtures in unentangled polymer melts

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c3sm27874c· OSTI ID:1876168
 [1];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
Here, we explore the rheology of high density glasses formed by binary colloidal mixtures in unentangled polyethylene glycol melts with a molecular weight of 400. A particle size ratio δ = dl/ds = 4.8 is chosen to ensure that mixing results in a reduction in composite rheology without phase separation for a fixed high total volume fraction, Φc. We explore frequency dependent linear viscoelastic behaviors, yielding and shear-thickening behaviors, and study properties as a function of the volume fraction ratio of the large particles, R. We characterize the cross-over volume fractions which denote the onset of transient particle localization, Φx, and the maximum packing fractions, Φm, and find that both are non-monotonic functions of R, with Φmx being a constant as R is varied from 0 to 1. Hard sphere scaling fails to capture the effects of particle size when R = 0 and R = 1, demonstrating that, even for these low molecular weight oligomers, polymer absorption and alterations of polymer configurations modify pair potentials away from being solely volume exclusion in nature. Changes in linear rheology, yielding behavior and shear-thickening are discussed in terms of a pseudo one-component model that depends on the dimensionless volume fraction Φ* = (Φm - Φx)/(Φmc).
Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-07ER46453; FG02-07ER46471
OSTI ID:
1876168
Journal Information:
Soft Matter, Journal Name: Soft Matter Journal Issue: 11 Vol. 9; ISSN 1744-683X
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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