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Search Publications by: Kathryn L. Beers (Fed)

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Displaying 176 - 196 of 196

Fourier Analysis Near-Field Polarimetry for Measurement of Local Optical Properties of Thin Films

July 1, 2003
Author(s)
Lori S. Goldner, Michael J. Fasolka, S Nougier, H P. Nguyen, Garnett W. Bryant, Jeeseong Hwang, K D. Weston, Kathryn L. Beers, A Urbas, Edwin L. Thomas
We present measurements of the local dichroism and birefringence of thin film specimens us ing techniques that combine near-field scanning optical microscopy (NSOM) and a novel polarization modulation (PM) polarimetry utilizing Fourier analysis of the

MALDI-TOF Mass Spectral Characterization of Covalently-Cationized Polystyrene

July 1, 2003
Author(s)
Sheng Lin-Gibson, S Bencherif, Kathryn Beers, H M. Byrd
Bromine terminated, controlled molecular mass polystyrene with narrow polydispersity (Mn 40 000 g/mol, PD = 1.08) was prepared by atom transfer radical polymerization. The bromine end group was subsequently substituted with a phosphonium salt. We report

Near-Field Polarimetric Characterization of Semi-Crystalline Polymer Systems

March 1, 2003
Author(s)
S N. Goldie, Michael J. Fasolka, Lori S. Goldner, Jeeseong C. Hwang, Kathryn Beers
We have studied crystallization in thin films of isotactic polystyrene (iPS) to better understand the morphology and formation of these structures through the use of polarization modulation near-field scanning optical microscopy (PM-NSOM). Polymer

Polymer Science at the NIST Combinatorial Methods Center

August 1, 2002
Author(s)
Cher H. Davis, Kathryn L. Beers, Aaron M. Forster, Christopher M. Stafford, A P. Smith, C Harrison, Weiping Zhang, Alamgir Karim, Eric J. Amis
The measurements, standards, and test methods developed by NIST, in partnership with other organizations, often help unlock the potential of new discoveries and budding technologies. Combinatorial methods are a textbook example. These emerging tools can

Near-Field Optical Imaging of Microphase Separated and Semi-Crystalline Polymer Systems

January 1, 2002
Author(s)
Michael J. Fasolka, Lori S. Goldner, A Urbas, Jeeseong C. Hwang, Kathryn Beers, P DeRege, Evan L. Thomas
Polymer self-assembly presents an attractive means of creating the micro- and nano-patterned spatial arrays required for many opto-electronic and coatings technologies. Two of these ordering processes are microphase separation (MS), exhibited by block

High Throughput Approach to Crystallization in Thin Films of Isotactic Polystyrene

August 1, 2001
Author(s)
Kathryn L. Beers, Jack F. Douglas, Eric J. Amis, Alamgir Karim
The dependence of the crystallization rate of isotactic polystyrene was measured as a function of film thickness and temperature on films with continuous gradients. The results agreed with literature values obtained on discrete films. This validates the

Crystallization of Isotactic Polystyrene in Thin Films: A High Throughput Approach

January 1, 2001
Author(s)
Kathryn L. Beers, Jack F. Douglas, Eric J. Amis, Alamgir Karim
Very thin films of semi-crystalline polymers are increasingly being employed in coatings applications and there is a need to better understand how film thickness and crystallization conditions influence the crystalline morphology and resultingfilm
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