Although several other neutron rheometers have been built to study soft matter under nonequilibrium conditions, none of them have the ability to measure the structure and behavior of the polymeric interfacial regions in highly viscous polymer melts which require high torques/high strain rates and high temperatures. A neutron rheometer in the cone and plate geometry has been constructed at the Los Alamos Neutron Science Center to rectify this lack of experimental instrumentation. It is also the first-of-its-kind to perform neutron reflectivity studies concurrently with rheological measurements. The details of both the development and testing of the Los Alamos Neutron Science Center neutron rheometer in the cone and plate configuration are described. Proof of principle neutron reflectivity results of end-grafted polystyrene against an identical melt under shear are presented, showing qualitatively that the structural attributes of the end-grafted polymer change when exposed to shear.
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Research Article|
May 04 2010
The Los Alamos Neutron Science Center neutron rheometer in the cone and plate geometry to examine tethered polymers/polymer melt interfaces via neutron reflectivity
Leslie A. Sasa;
Leslie A. Sasa
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
2Department of Mechanical and Aerospace Engineering,
University of California at Los Angeles
, Los Angeles, California 90095, USA
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Eric J. Yearley;
Eric J. Yearley
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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Cynthia F. Welch;
Cynthia F. Welch
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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Mark A. Taylor;
Mark A. Taylor
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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Robert D. Gilbertson;
Robert D. Gilbertson
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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Christopher Hammeter;
Christopher Hammeter
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
3Department of Mechanical Engineering,
University of California at Santa Barbara
, Santa Barbara, California 93106, USA
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Jaroslaw Majewski;
Jaroslaw Majewski
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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Rex P. Hjelm
Rex P. Hjelm
a)
1Los Alamos Neutron Scattering Center,
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Rev. Sci. Instrum. 81, 055102 (2010)
Article history
Received:
January 07 2010
Accepted:
March 16 2010
Citation
Leslie A. Sasa, Eric J. Yearley, Cynthia F. Welch, Mark A. Taylor, Robert D. Gilbertson, Christopher Hammeter, Jaroslaw Majewski, Rex P. Hjelm; The Los Alamos Neutron Science Center neutron rheometer in the cone and plate geometry to examine tethered polymers/polymer melt interfaces via neutron reflectivity. Rev. Sci. Instrum. 1 May 2010; 81 (5): 055102. https://doi.org/10.1063/1.3381037
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