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Research
Interests
In our studies
of advanced polymeric and nanostructured materials,
we are fundamentally interested in the relationship
between processing (i.e., flow) and micro- and nanostructure.
The materials of interest are broadly classified as
complex fluids, which include polymeric fluids, liquid
crystal and liquid crystal polymers, suspensions, and
emulsions among others. These materials can be found
in commercial packaging, automobiles, household appliances,
computer displays, paints, and a wide spectrum of other
applications, highlighting their technological importance.
The diverse
utility of these materials also underscores the broad
range of available material properties. Molecular architecture
and processing history can both have a profound effect
on the properties of the final product. In fact, critical
to improved processibility of these materials is knowledge
of the relationship between flow, molecular-level structure,
and macroscopic material properties, the so-called structure-property
relations. In our work, we apply a number of optical
techniques, including birefringence, dichroism, optical
and transmission electron microscopy, and light scattering,
to probe these systems in well-characterized flow fields.
We also use x-ray and neutron scattering to elucidate
structure at a finer length scale.
Current
Research Projects
- Rheo-Optical
Studies of Polymer-Clay Nanocomposite Solutions
- The Role
of Molecular Architecture in Polymer Blend Relaxation
Dynamics
- Flow-Induced
Crystallization of Polypropylene-Clay Nanocomposites
- The Role
of Polymer Molecular Architecture in Controlling Morphology
in Flow-Induced Crystallization
- Rheo-FTIR
Studies of Polymer-Carbon Nanotube Composites
Selected
Publications
J.P. Oberhauser,
R.S. Graham, T. Sridhar, T.C.B. McLeish, and L.G. Leal,
"Comparisons of microscopic models for entangled
polymer rheology with nonlinear viscoelastic data,"
in preparation.
T.E. Karis,
B. Marchon, M.D. Carter, P.R. Fitzpatrick, and J.P.
Oberhauser, "Humidity effects in magnetic recording,"
IEEE Transactions on Magnetics, 41 593-598 (2005)
J.P. Oberhauser,
K. Pham, and L.G. Leal, "Rheo-optical studies of
the response of entangled polymer solutions to step
changes in shear rate," Journal of Rheology 48
(6), 1229-1249 (2004).
F. Viola,
M.D. Kramer, M.B. Lawrence, J.P. Oberhauser, and W.F.
Walker, "Sonorheometry: A non-contact method for
the dynamic assessment of thrombosis," Annals of
Biomedical Engineering 32 (5), 696-705 (2004).
P.K. Bhattacharjee,
J.P. Oberhauser, G.H. McKinley, L.G. Leal, and T. Sridhar,
"Extensional rheometry of entangled solutions,"
Macromolecules 35 (27), 10131-10148 (2002).
M. Moffitt,
Y. Rharbi, J-D. Tong, M.A. Winnik, D.W. Thurman, J.P.
Oberhauser, J.A. Kornfield, and R.A. Ryntz, "Stratified
morphology of a polypropylene-elastomer blend following
channel flow," Journal of Polymer Science, Part
B: Polymer Physics 40 (24), 2842-2859 (2002).
M. Seki,
D.W. Thurman, J.P. Oberhauser, and J.A. Kornfield, "Shear-mediated
crystallization of isotactic polypropylene: The role
of long chain-long chain overlap," Macromolecules
35 (7), 2583-2594 (2002).
L.G. Leal
and J.P. Oberhauser, "Non-Newtonian fluid mechanics
for polymeric liquids: A status report," Korea-Australia
Rheology Journal 12 (1), 1-25 (2000).
D. Yavich,
D.W. Mead, J.P. Oberhauser, and L.G. Leal, "Experimental
studies of an entangled polystyrene solution in steady
state mixed type flows," Journal of Rheology 42
(3), 671-695 (1998).
J.P. Oberhauser,
L.G. Leal, and D.W. Mead, "The response of entangled
polymer solutions to step changes of shear rate: Signatures
of segmental stretch?" Journal of Polymer Science,
Part B: Polymer Physics 36 (2), 265-280 (1998).
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