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Displaying 1751 - 1775 of 1935

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

Tri-Alpha-Napthyl Benzene as a Crystalline or Glassy Matrix for Matrix-Assisted Laser Desorption/Ionization: A Model System for the Study of Effects of Dispersion of Polymer Samples at a Molecular Level

January 1, 2002
Author(s)
Barry J. Bauer, Kathleen M. Flynn, Da-Wei Liu, William R. Blair
Tri-a-napthyl benzene (TaNB) is used as a matrix in matrix-assisted laser desorption/ionization (MALDI) spectroscopy. Electrosprayed TaNB is crystalline and has a melting point of 180 2 C. After heating above the melting point, TaNB becomes amorphous with

Variation of Electrical Properties With Exfoliation Condition in Nanocomposites

January 1, 2002
Author(s)
M M. McBrearty, Anthony J. Bur, S C. Roth
Dielectric measurements were made on clay filled nylon and polyethylene-ethyl vinyl acetate (PE-EVA) copolymer nanocomposites during processing by extrusion. Nylon without clay had a small dielectric dispersion while PE-EVA did not. The addition of natural

Convalent Cationization Method for the Analysis of Polyethylene by Mass Spectrometry

December 1, 2001
Author(s)
Barry J. Bauer, William E. Wallace, B M. Fanconi, Kathleen M. Flynn
Polyethylene and other polyolefins have not been amenable to mass spectrometric characterization of molecular mass distribution due to the ineffectiveness of conventional methods of cationization. The lack of polar groups, unsaturation, and aromaticity

Dispersion and Nucleating Effects of Clay Fillers in Nanocomposite Polymer Films

December 1, 2001
Author(s)
V Ferreiro, G Schmidt, Charles C. Han, Alamgir Karim
Nanocomposite polymeric materials offer unique properties such as mechanical, electrical, thermal, etc. Such property enhancements are induced not only by the physical presence of the filler but also by the interaction of the polymer with the filler and

Interfacial Shear Strengths of Dental Resin-Glass Fibers by the Microbond Test

November 1, 2001
Author(s)
Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers
In this study, the feasibility of using the microbond test (MBT) to probe the durability of the bond between a dental resin with differently silanized E-glass fibers was investigated. The E-glass fibers were silanized with equivalent amounts of two types

Time-Resolved Isothermal Crystallization of Absorbable PGA-co-PLA Copolymer by Synchrotron Small-Angle X-Ray Scattering and Wide-Angle X-Ray Diffraction

October 1, 2001
Author(s)
Z G. Wang, X H. Wang, B S. Hsiao, S Andjelic, D Jamiolkowski, J McDivitt, J Fischer, J Zhou, Charles C. Han
The isothermal crystallization behavior of absorbable dyed and undyed PGA-co-PLA copolymers was investigated by time-resolved simultaneous synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) methods. The morphological
Displaying 1751 - 1775 of 1935
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