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Displaying 1726 - 1750 of 1882

MALDI MS of Saturated Hydrocarbon Polymers: Polyethylene and Other Polyolefins

May 1, 2001
Author(s)
William E. Wallace, Charles M. Guttman, B M. Fanconi, Barry J. Bauer
Saturated hydrocarbon polymers, polyethylene and polypropylene, are, by production volume, the most widely used of all synthetic polymers. Their molecular mass and molecular mass distribution (MMD) are critical in determining performance properties. There

Effect of Self-Assembled Monolayer Technology on Fiber-Matrix Adhesion

April 1, 2001
Author(s)
Gale A. Holmes, E Feresenbet, D T. Raghavan
The concept of an interphase region between an adherent and a matrix or adhesive was first introduced in 1972 by Sharpe. Since this introduction, the role of the interphase region in controlling the performance of fibrous composites has been extensively

Making MALDI-TOF-MS an Absolute Method for Determination of the MMD of Polymers

April 1, 2001
Author(s)
Charles M. Guttman, William R. Blair, S Wetzel
In 1963, Donald McIntyre of the NBS Polymers Division produced the first polymer molecular mass standards to be issued by NBS as Standard Reference Materials (SRM), SRM 705. The appearance of this SRM marked the beginning of a long and continuing tradition

Mass Spectrometry of Spin-On-Glass Low-K Dielectric Precursors

April 1, 2001
Author(s)
William E. Wallace, Kathleen M. Flynn, Joseph M. Antonucci
The degree-of-intramolecular-condensation, defined as the number of residual silanol (SiOH) groups per oligomer, for a variety of silsesquioxane polymers was measured by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Reaction

Structure and Property Characterization of Low-k Dielectric Porous Thin Films

April 1, 2001
Author(s)
Barry J. Bauer, Eric K. Lin, V. J. Lee, Haonan Wang, Wen-Li Wu
High-resolution X-ray reflectivity and small angle neutron scattering measurements are used as complementary techniques to characterize the structure and properties of porous thin films for use as low-k interlevel dielectric (ILD) materials. With the

The Influence of Molecular Architecture and Solvent Type on the Size and Structure of Poly (Bezyl Ether) Dendrimers by SANS

April 1, 2001
Author(s)
G Evmenenko, Barry J. Bauer, R Kleppinger, B Forier, W Dehaen, Eric J. Amis, N Mischenko, H Reynaers
The size of poly(benzyl ether) dendrimers with different molecular architectures was measured by small angle neutron scattering (SANS). Both polar and non-polar solvents were used to measure the effect of solvent type. The radius of gyration (Rg) of all of

NIST-Sponsored Interlaboratory Comparison of Polystyrene Molecular Mass Distribution Obtained by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry: Statistical Analysis

March 1, 2001
Author(s)
Charles M. Guttman, S Wetzel, William R. Blair, B M. Fanconi, Kathleen M. Flynn, R J. Goldschmidt, William E. Wallace, David L. VanderHart
Matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS) is becoming a new and important technique in synthetic polymer characterization. Yet much is still unknown about the molecular mass distribution (MWD) which is

Block Copolymer Thin Films: Physics and Applications

February 15, 2001
Author(s)
Michael J. Fasolka, A M. Mayes
A two-part review of research concerning block copolymer thin films is presented. The first section summarizes experimental and theoretical studies of the fundamental physics of these systems, concentrating upon the forces that govern film morphology. The

A Novel Microshear Test to Measure Dental Adhesion

February 1, 2001
Author(s)
Joseph M. Antonucci, Walter G. McDonough, Gary E. Schumacher, Y Shimada
A key factor in determining the strength and durability of polymeric dental restorative composites, sealants and adhesives is the quality of their interfaces/interphases. Bulk mechanical strength tests such as tensile, transverse and shear tests are

Crystallization of Isotactic Polystyrene in Thin Films: A High Throughput Approach

January 1, 2001
Author(s)
Kathryn L. Beers, Jack F. Douglas, Eric J. Amis, Alamgir Karim
Very thin films of semi-crystalline polymers are increasingly being employed in coatings applications and there is a need to better understand how film thickness and crystallization conditions influence the crystalline morphology and resultingfilm
Displaying 1726 - 1750 of 1882