Role of Particle Size and Polymer Length in Rheology of Colloid–Polymer Composites

Jiang, Tianying; Zukoski, Charles F.

doi:10.1021/ma301184t

Role of Particle Size and Polymer Length in Rheology of Colloid–Polymer Composites

Journal Article · Tue Dec 04 00:00:00 EST 2012 · Macromolecules

DOI:https://doi.org/10.1021/ma301184t· OSTI ID:1876172

Jiang, Tianying ^[1]; Zukoski, Charles F. ^[2]

Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois
Univ. of Illinois at Urbana-Champaign, IL (United States)

The effect of particle size on the flow properties of composite melts is explored. In this study we investigate a system composed of silica particles with diameter D_c = 127–730 nm in unentangled poly(ethylene glycol) of two molecular weights (400 with degree of polymerization ~9 and 2000 with degree of polymerization of 45). At low concentration, silica particles are stabilized by the adsorbed polymer layer as indicated by intrinsic viscosities slightly larger than the Einstein value of 2.5. Huggins coefficients indicate that at low concentration in PEG400 the particles behave very much like hard spheres, while in PEG2000 the particles experience very weak attractions. At high volume fraction, the absorbed polymer layers begin to interact such that hard-sphere scaling no longer applies to linear and nonlinear rheological responses. In PEG2000, at elevated volume fractions, the particles with stronger attractions experience kinetic arrest with average particle surface separations much larger than the polymer radius of gyration, R_g. We show that the linear rheology, yielding behavior, and shear thickening response of dense composites are varied with R_g/D_c, with volume exclusion glass formation observed at low R_g/D_c and gelation at high R_g/D_c, and with yielding and shear thickening properties changed by R_g and D_c independently. The polymer layers are found to alter the approach to the jamming transition even for R_g/D_c as small as 6 × 10^–3.

View Accepted Manuscript (DOE)

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:: 1876172

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 24 Vol. 45; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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