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Displaying 1776 - 1800 of 1882

Single Fiber Composites: A New Methodology for Determinig Interfacial Shear Strength

September 1, 2000
Author(s)
Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson
Two of the critical factors controlling the long-term performance and durability of composites in structural applications is the fiber-matrix interfacial shear strength (IFSS) and the durability of the fiber-matrix interface. The single fiber fragmentation

Dendrimer Templates for the Formation of Gold Nanoclusters

August 1, 2000
Author(s)
Franziska Grohn, Barry J. Bauer, Y A. Akpalu, C L. Jackson, Eric J. Amis
Charged poly(amidoamine) (PAMAM) dendrimers are used to create organic-inorganic hybrid colloids in aqueous solution. The formation of gold colloids upon reduction of a gold salt precursor serves as a model reaction to study the influence of reaction

Critical Issues in the Characterization of Polymers for Medical Applications

June 1, 2000
Author(s)
Walter G. McDonough, Eric J. Amis, J Kohn
On June 14, 2000, the New Jersey Center for Biomaterials and the Polymers Division of the National Institute of Standards and Technology (NIST) co-sponsored a one-day workshop on Critical Issues in the Characterization of Polymers for Medical Applications

MALDI-TOF MS Analysis of a Library of Polymerizable Cyclodextrin Derivatives

April 1, 2000
Author(s)
Rafael L. Bowen, M Farahani, Sabine H. Dickens, Charles M. Guttman
Polymerizable cyclodextrin derivatives (PCDs) have been proposed as candidates for use in dental therapeutics (Bowen, 1996 and Bowen and Reed, 1997). Here PCD libraries were synthosized by quasi-random reactions of 6 moles of methacrylic anhydride plus 7

Polymer Division Technical Activities - 1999

April 1, 2000
Author(s)
Eric J. Amis, B M. Fanconi
Technical activities of the Polymers Division, 854, for the 1999 fiscal year are described. The report is organized by programs: Electronic Packaging, Interconnection and Assembly; Polymer Blends and Processing; Polymer Composites; Polymer Characterization

Determination of the Molecular Mass Distribution of Narrow Polydispersity Polystyrene by MALDI-TOF-MS: Interlaboratory Comparison

March 1, 2000
Author(s)
Kathleen M. Flynn, S Wetzel, William E. Wallace, William R. Blair, R J. Goldschmidt, David L. VanderHart, B M. Fanconi
NIST has sponsored a matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) interlaboratory comparison using a well-characterized polystyrene to determine the reproducibility in determining the molecular mass

MALDI-TOF Mass Spectrometry of Polymeric Silsesquioxanes

March 1, 2000
Author(s)
William E. Wallace, Charles M. Guttman, Joseph M. Antonucci
Matrix-assisted laser desorption ionization time-of-flight mass spectrometry has been shown to be an effective method to determine the degree-of-intramolecular-condensation of polymeric silsesquioxanes. The nature of the organic R' leaving group was found

Preparation and Characterization of Polymer/Dendrimer Blends: Final Report, March 2000

March 1, 2000
Author(s)
Eric J. Amis, Barry J. Bauer, A Topp, F Groehn, T J. Prosa, B D. Viers, Da-Wei Liu, K A. Barnes, C L. Jackson, G Nisato, Alamgir Karim, Jack F. Douglas
This report is a summary of the results of measurement and characterization on dendritically branched polymers that was done under Army Research Office Grant contract 35109-CH. This summary encompasses 3 previous NISTIR's for consecutive 12 month periods

Templating Nanocrystals with Dendrimers: A Mesoscopic Model System

March 1, 2000
Author(s)
Franziska Grohn, Barry J. Bauer, Eric J. Amis
Poly(amidoamine) (PAMAM) dendrimers of generation 2 to 10 are used to create organic-inorganic hybrid colloids in aqueous solution. The formation of gold colloids upon reduction of a gold salt precursor serves as model reaction to study influences on the

An Optical Sensor for Polymer Injection Molding

January 1, 2000
Author(s)
Anthony J. Bur, C L. Thomas
An optical sensor using fiber optics to access the mold cavity was used to monitor the mold filling and cooling phases of injection molding. The sensor consists of a sapphire window at the end of a sleeved ejector pin into which an optical fiber is

Blends of Fatty-Acid-Modified Dendrimers With Polyolefins

January 1, 2000
Author(s)
Barry J. Bauer, A Ramzi, D W. Liu, R L. Scherrenberg, P Froehling, J Joosten
Blends were made by solution and melt mixing fatty acid modified dendrimers with various polyolefins. Small angle neutron scattering (SANS) was used to determine the miscibility of the blends. Poly propylene imine (PPI) dendrimers G1, G3, and G5 (DAB-dendr
Displaying 1776 - 1800 of 1882