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Displaying 1701 - 1725 of 1944

Combinatorial Mapping of Surface Energy Effects on Diblock Copolymer Thin Film Ordering

January 1, 2003
Author(s)
A P. Smith, A Sehgal, Jack F. Douglas, Alamgir Karim, Eric J. Amis
Combinatorial gradient techniques are used to map the thin film morphology dependence of symmetric diblock copolymers as a function of film thickness and substrate surface energy. An inversion from symmetric to asymmetric lamellar morphology is observed as

Macromolecules at Surfaces: Research Challenges and Opportunities From Tribology to Biology

January 1, 2003
Author(s)
S Granick, E. J. Kramer, R Nuzzo, T P. Russell, C R. Safinya, S K. Kumar, Eric J. Amis, M Antonietti, A C. Balazs, Abhijit K. Chakraborty, Gary S. Grest, C Hawker, P Janmey
A comprehensive review of ongoing and recommended research directions concerning the structure, dynamics, and interfacial activity of synthetic and naturally occurring macromolecules at the solid-liquid interface is presented.

MALDI of Structured Polymer Particles

January 1, 2003
Author(s)
Barry J. Bauer, Kathleen M. Flynn
A layered preparation method is introduced that produces structured MALDI targets with well-defined phase sizes and compositions. Tri-a-naphthyl benzene is a glassy matrix that forms smooth films. It is layered with polystyrenes or polyethylene glycol

Measuring the Mechanical Properties of a Thin Polymeric Film by AFM

January 1, 2003
Author(s)
P M. McGuiggan, D J. Yarusso
The atomic force microscope is used to measure the tan delta (loss modulus/storate modulus) of a thin film of poly(n-butylacrylate) as a function of frequency. The AFM results are in good agreement with indenter measurements. The results demonstrate that

Characterization of Linear and Branched Polyethylenimine (PEI) by ESI-MS and MALDI-TOF-MS

December 31, 2002
Author(s)
Kathleen M. Flynn, M Konaklieva, J P. Gu, Charles M. Guttman, S Wetzel
Polyethylenimine (PEI) is being used as a DNA transfection agent. Complexes of DNA and PEI are known to pass through the wall of a cell, and studies have reported that PEI s efficiency as a gene delivery vehicle depends on its molecular weight. Molecular

Effects of Melt-Processing Conditions on the Quality of Poly(ethylene terephthalate) Montmorillonite Clay Nanocomposites

December 1, 2002
Author(s)
Cher H. Davis, L J. Mathias, Jeffrey W. Gilman, D Schiraldi, Paul C. Trulove, T X. Suttos, H X. DeLong
The effects of melt intercalation processing conditons on the quality of poly(ethylene terephthalate) montmorillonite clay nanocomposites have been investigated by thermal gravametric analysis (TGA), X-ray diffraction XRD), and transmission electronic

Layered Droplet Microstructures in Sheared Emulsions: Finite-Size Effects

November 1, 2002
Author(s)
Jai A. Pathak, M C. Davis, Steven D. Hudson, Kalman D. Migler
We investigate the influence of confinement on the steady state microstructure of emulsions sheared between parallel plates, in a regime where the average droplet dimension is comparable to the gap width between the confining walls. Utilizing droplet

Viscoelastic Characterization of Sealant Materials

September 18, 2002
Author(s)
Donald L. Hunston, Christopher C. White
Polymeric sealants are an important example of a major consumer product where the performance depends critically on rheological properties. The work here developed a testing and modeling procedure to characterize the basic mechanical properties of sealant
Displaying 1701 - 1725 of 1944
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