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Search Publications by: Sheng Lin-Gibson (Fed)

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Displaying 101 - 115 of 115

MALDI-TOF MS Characterization of Covalent Cationized Polyethylene

August 1, 2003
Author(s)
Sheng Lin-Gibson, D L. Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Kathleen M. Flynn, William E. Wallace
MALDI-TOF MS generally uses metal salts to cationize synthetic polymers, such as polystyrene. However, reduced analyte signal often results from complications during the metal ionization processes in the gas phase including competition between the analyte

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

Orientation of Carbon Nanotubes in a Sheared Polymer Melt

May 1, 2003
Author(s)
Erik K. Hobbie, Haonan Wang, H W. Kim, Sheng Lin-Gibson, E A. Grulke
Optical measurements of the shear response of dilute ensembles of multi-walled carbon nanotubes dispersed in a polybutadiene melt are presented. At low shear stress, the measurements suggest that the tubes are broadly oriented along the direction of flow

Chemistry and Properties of Phenolic Resins and Networks

January 1, 2003
Author(s)
Sheng Lin-Gibson, J S. Riffle
This book chapter emphasizes the recent mechanistic and kinetic findings on phenolic oligomer synthesis and network formation. The synthesis and characterization of both novolac and resole type phenolic resins and their resulting networks are described

Chitosan Hydrogels Crosslink Kinetics and Gel Properties

January 1, 2003
Author(s)
Sheng Lin-Gibson, H J. Walls, S B. Kennedy, E R. Welsh
Cure kinetics and network properties of biocompatible hydrogels prepared by the reaction of chitosan and a water soluble blocked diisocyanate have been measured using rheometry. The reactions follow the Arrhenius behavior from which apparent activation

MALDI MS Characterization of Covalent Cationized Polyethylene

August 1, 2002
Author(s)
Sheng Lin-Gibson, D L. Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Kathleen M. Flynn, William E. Wallace
Polyolefins, saturated hydrocarbon polymers such as polyethylene (PE) and polypropylene, are, by production volume, the most widely used of all A new method for the mass spectrometry of saturated polyolefins whereby an organic cation is covalently bonded

Optimizing the Covalent Cationization Method for the Mass Spectrometry of Polyolefins

August 1, 2002
Author(s)
Sheng Lin-Gibson, L Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Charles M. Guttman, William E. Wallace
Previously a new method was introduced for the mass spectrometry of polyolefins whereby an organic cation is covalently bonded to the polymer to produce the necessary ionization for the creation of intact gas?phase macromolecules by matrix-assisted laser

Rheology of Poly(ethylene oxide) Clay Solutions

August 1, 2002
Author(s)
Sheng Lin-Gibson, G Schmidt, Jai A. Pathak, Charles C. Han
Poly(ethylene oxide) and Laponite, a synthetic hectorite clay, form highly viscoelastic solutions in water. Above a certain clay concentration, these solutions can be described as physical crosslinked networks where clay platelets undergo equilibrium