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Displaying 1901 - 1925 of 1926

Demineralizing Effect of Dental Cements on Human Dentin

November 1, 1998
Author(s)
Y Shimada, Y Kondo, S Inokoshi, J Tagami, Joseph M. Antonucci
This study was undertaken to verigy the hypothesis that dentin surfaces are demineralized during placement of four kinds of chemically setting cements (zinc phosphate cement, luting glass-ionomer cement, restorative glass-ionomer cement, and zinc

Effect of Powder Grinding on Hydroxyapatite Formation in a Polymeric Calcium Phosphate Cement Prepared from Tetracalcium Phosphate and Poly[Methyl Vinyl Ether-Maleic Acid]

November 1, 1998
Author(s)
Y Matsuya, S Matsuya, Joseph M. Antonucci, S. Takagi, Laurence C. Chow, A Akamine
The primary aim of this study was to determine if cement based on poly(methyl vinyl ether-maleic acid) (PMVE-Ma) and tetracalcium phosphate (TTCP) resulted in hydroxyapatite (OHAp) formation. In addition, the mechanical strength of this type of polymeric

Interface Adhesion of E-Glass Fibers in Model Polyisocyanurate Networks

September 23, 1998
Author(s)
Walter G. McDonough, Gale A. Holmes, R C. Peterson
Recent work examining the nature of the failure process of glass/epoxy specimens in the single fiber fragmentation test showed that the matrix exhibited pronounced non-linear viscoelastic behavior during the test, and that the interfacial shear strength

The Growth Kinetics of Nanocrystalline ZnO Colloidal Solutions

September 11, 1998
Author(s)
E M. Wong, John E. Bonevich, P C. Searson
Colloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. Although the synthesis and unique properties of these materials are well known, the kinetics of the growth process are not well understood. The particle

Characterization of Planarity of Polymer Thin Films on Rough Surfaces

July 1, 1998
Author(s)
Wen-Li Wu, William E. Wallace
Angle-dependent total reflection x-ray fluorescence (TRXF) is used to characterize the surface roughness or the extent of planarization of a thin polymer coating on a stainless steel surface with significant roughness. The objective of this work is to

Preparation and Characterization of Polymer/Dendrimer Blends Progress Report 2/24/97

June 1, 1998
Author(s)
Eric J. Amis, Barry J. Bauer, F I. Groehn, T J. Prosa, Da-Wei Liu, K A. Barnes, C L. Jackson, B D. Viers, Alamgir Karim, Jack F. Douglas
Dendrimer, dendrigraft, and hyperbranched solutions, blends, and interpenetrating polymer networks are characterized by small neutron and x-ray scattering, reflectivity, atomic force microscopy, and transmission electron microscopy.

Physical Aging Behavior in Amorphous Pen Film as Measured by Creep

May 1, 1998
Author(s)
M L. Cerrada, G B. McKenna, J M. O'Reilly, J E. Greene, J R. Gillmor
Characterization of the viscoelastic and aging responses of poly [ethylene naphthalate] [PEN] is of increasing interest as this material begins to see greater use in commercial applications. In typical aging experiments, one quenches the glass transition

Preparation and Characterization of Polymer/Dendrimer Blends Progress Report 3/31/98

April 1, 1998
Author(s)
Eric J. Amis, Barry J. Bauer, A Topp, T J. Prosa, Da-Wei Liu, C L. Jackson, Alamgir Karim, B D. Ermi, K A. Barnes, A Nakatani, G Nisato, R Ivkov
Dendrimer and dendrigraft solutions, blends, and interpenetrating polymer networks are characterized by small angle neutron and x-ray scattering, reflectivity, and transmission electron microscopy.

Modeling of Multi-Step Nonlinear Stress Relaxation in DGEBA/M-PDA Epoxy Resins

March 4, 1998
Author(s)
Gale A. Holmes, R C. Peterson, Donald L. Hunston
Multi-step stress relaxation data from a DGEBA/m-PDA epoxy resin is modeled using a nonseparable nonlinear constitutive equation. The form of the equation is based on nonlinear concepts and ideas developed in melt rheology. Although time-strain

The Influence of the matrix Modulus on the interfacial Shear Strength Parameter

February 25, 1998
Author(s)
Gale A. Holmes, R C. Peterson, Donald L. Hunston, Walter G. McDonough
In composite structures, adhesion at the fiber-matrix interface is typically determined indirectly from experimental data and theoretical models. These models make varying assumptions about the fiber, matrix, and fragmentation process. Therefore, the

Recertification of SRM 706a, a Polystyrene

January 1, 1998
Author(s)
Kathleen M. Flynn, William R. Blair, J R. Maurey
The recertification of the polystyrene standard reference material, SRM 706a, is described. The Mw of SRM 706a by light scattering was determined to be 2.85 x 10 5 g/mol with a sample standard deviation of 0.019 x 10 5 g/mol. A combined expanded
Displaying 1901 - 1925 of 1926
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