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Characterization of Pmma Gel Spheres and Shear Induced Microstructure

Published online by Cambridge University Press:  25 February 2011

S. E. Paulin ,
Bruce J. Ackersons  and
M. S. Wolfe
S. E. Paulin
Affiliation:
Oklahoma State University, Stillwater, OK 74078
Bruce J. Ackersons
Affiliation:
Oklahoma State University, Stillwater, OK 74078
M. S. Wolfe
Affiliation:
Central Research and Development Department, E. I. du Pont de Nemours and Company, Wilmington, DE 19880-0356
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Abstract

Polymethylmethacrylate (PMMA) particles are suspended without additional free polymer in benzyl alcohol, where they swell to nearly three times their dry radius. The single particle properties are examined by static and dynamic light scattering measurements, as well as by intrinsic viscosity measurements. A colloidal liquid/crystal phase diagram is determined as a function of effective volume fraction determined from the intrinsic viscosity. The samples are subjected to oscillatory shear flows to determine the influence of flow on the particle microstructure. A nonequilibrium phase diagram is constructed indicating a correlation between spontaneous ordering at equilibrium and shear induced ordering. These results are compared with previous work done for hard PMMA sphere suspensions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 259
Copyright
Copyright © Materials Research Society 1992

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