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Displaying 42026 - 42050 of 74171

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

Clock Jitter Estimation based on PM Noise Measurements

January 1, 2003
Author(s)
David A. Howe, T Tasset
"Jitter" is the noise modulation due to random time shifts on an otherwise ideal, or perfectly on-time, signal transition. In the absence of ultra-high-speed jitter analyzers, spectrum analysis is an alternate noise measurement for timing jitter

Combinatorial Mapping of Polymer Blends Phase Behavior

January 1, 2003
Author(s)
Alamgir Karim, A Sehgal, Eric J. Amis, J C. Meredith
Methodologies for phase behavior characterization allow for discovery of new models for structure-processing-property relationships in polymer blends. Several recent developments were presented in the combinatorial characterization of polymers blends phase

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

Comparing Mass Spectra: When Do They Match?

January 1, 2003
Author(s)
Stephen E. Stein
A common method of determining the identity of a compound is to compare its spectrum against a known standard spectrum of the same substance. Comparisons can be made based on a variety of criteria. How does an analyst know that a match has occurred when
Displaying 42026 - 42050 of 74171
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