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Search Publications by: Sheng Lin-Gibson (Fed)

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Displaying 101 - 123 of 123

Synthesis and Characterization of PEG Dimethacrylates and their Hydrogels

July 1, 2004
Author(s)
Sheng Lin-Gibson, S Bencherif, James A. Cooper, S Wetzel, Joseph M. Antonucci, Brandon M. Vogel, F Horkay, N. R. Washburn
Facile synthesis and detailed characterization of photo-polymerizable and biocompatible poly(ethylene glycol) dimethacrylates (PEGDM) and poly(ethylene glycol) urethane-dimethacrylates (PEGUDM) are described. Poly(ethylene glycol)s of various molecular

Shear-Induced Structure in Polymer-Clay Nanocomposite Solutions

June 1, 2004
Author(s)
Sheng Lin-Gibson, H W. Kim, G Schmidt, Charles C. Han, Erik K. Hobbie
Abstract: The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the bridging of neighboring

Ubiquity of Domain Patterns in Sheared Viscoelastic Fluids

June 1, 2004
Author(s)
Erik K. Hobbie, Sheng Lin-Gibson, Haonan Wang, Jai A. Pathak, H W. Kim
We propose a unified explanation of pattern formation in sheared two-phase viscoelastic fluids that fall within the simple paradigm of interacting soft elastic domains suspended in a less viscous fluid under simple shear flow. Three very different systems

Synthesis and Characterization of PEG and PEG Urethane Dimethacrylate Hydrogels

March 1, 2004
Author(s)
Sheng Lin-Gibson, S Bencherif, James A. Cooper, N. R. Washburn, Joseph M. Antonucci
A key area in the repair and regeneration of tissues is optimizing the polymeric scaffold-tissue response. This study is designated to better understand the relationships between polymer matrix structure and properties to cell response. The current study

Elastic Flow Instability in Nanotube Suspensions

January 1, 2004
Author(s)
Sheng Lin-Gibson, Jai A. Pathak, E A. Grulke, Haonan Wang, Erik K. Hobbie
We report an elastic instability associated with flow-induced clustering in non-Brownian colloidal nanotubes. Rheo-optical measurements are compared with recent simulations of mechanical flocculation in sheared fiber suspensions, and we observe an

Protein and Solvent Dynamics: How Strongly Are They Coupled?

January 1, 2004
Author(s)
G Caliskan, D Mechtani, J H. Roh, A Kisliuk, Alexei Sokolov, S Azzam, Marcus T. Cicerone, Sheng Lin-Gibson, I Peral
Analysis of Raman spectra of protein lysozyme demonstrates that its dynamics follow well the dynamics of solvents glycerol and trehalose. The protein s fast conformational fluctuations and low-frequency vibrations and their temperature variations are very

Orientation of Platelets in Multilayered Nanocomposite Polymer Films

December 1, 2003
Author(s)
M M. Malwitz, Sheng Lin-Gibson, Erik K. Hobbie, Paul Butler, G Schmidt
The orientation of platelets in micron thick polymer-clay nanocomposite films was investigated by means of small-angle neutron scattering (SANS), small angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD). The films with various clay

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
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