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Displaying 1851 - 1875 of 1935

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

Real-Time Dielectric Measurements During Extrusion of Filled Polymers

January 1, 2000
Author(s)
M M. McBrearty, Anthony J. Bur, S C. Roth
Mineral fillers are added to extend and modify physical properties of polymers. To achieve porcessing control of mixing, real-time measurements are needed. Previuos work has shown that dielectric sensors can measure concentrations of fillers in non-polar
Displaying 1851 - 1875 of 1935
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