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Displaying 1676 - 1700 of 1926

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

Chemistry of Silanes Interfaces in Dental Polymers and Composites

January 1, 2003
Author(s)
Joseph M. Antonucci, Sabine H. Dickens, Bruce O. Fowler, H H. Xu, Walter G. McDonough
The performance and service life of glass- or ceramic-filled polymeric composites depend on the nature of their resin, filler and interfacial phases as well as the efficacy of the polymerization process. The synergy that exists between the organic polymer

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

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
Displaying 1676 - 1700 of 1926
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