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You searched on: Author: william wallace

Displaying records 61 to 70 of 95 records.
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61. Optimization of the Covalent Cationization for the Mass Spectrometry of Polyolefins
Published: 1/1/2002
Authors: Barry J. Bauer, Sheng Lin-Gibson, L Brunner, David Lloyd VanderHart, B M Fanconi, Charles Martin Guttman, William E Wallace

62. Prediction of Lateral and Normal Force-Displacement Curves for Flipchip Solder Joints
Published: 1/1/2002
Authors: Daniel Wheeler, Daniel Josell, James A Warren, William E Wallace

63. Convalent Cationization Method for the Analysis of Polyethylene by Mass Spectrometry
Published: 12/1/2001
Authors: Barry J. Bauer, William E Wallace, B M Fanconi, Kathleen M. Flynn
Abstract: Polyethylene and other polyolefins have not been amenable to mass spectrometric characterization of molecular mass distribution due to the ineffectiveness of conventional methods of cationization. The lack of polar groups, unsaturation, and aromatic ...

64. Characterization of a [(O3/2SiMe)(x)(Osi(OH)Me)(y) (OSiMe2)z] silsesquioxane copolymer resin by mass spectrometry
Published: 11/1/2001
Authors: R E Tecklenburg, William E Wallace, H Chen
Abstract: Silsesquioxanes or three-dimensional organosilicon resins, continue to generate much interest due to their unique structures and physical properties. Methyl silsesquioxanes can be formed at room temperature by simple acid catalyzed hydrolysis and co ...

65. Characterization of a [(O^d3/2^SiMe)^dx^(OSi(OH)Me)^dy^(OSiMe^d2^)z] Silsesquioxane Copolymer Resin by Mass Spectrometry
Published: 11/1/2001
Authors: R E Tecklenburg, William E Wallace, H Chen
Abstract: Electrospray ionization Fourier transform ion cyclotron resonance (ESI FTICR) mass spectrometry and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry were applied to a complex silsesquioxane-siloxane copolymer r ...

66. Laser Desorption Ionization and MALDI Time-of-Flight Mass Spectrometry for Low Molecular Mass Polyethylene Analysis
Published: 11/1/2001
Authors: R Chen, T Yalcin, William E Wallace, Charles Martin Guttman, L Li
Abstract: Polyethylene's inert nature and difficulty to dissolve in conventional solvents at room temperature present special problems for sample preparation and ionization in mass spectrometric analysis. We present a study of ionization behavior of several p ...

67. Prediction of Lateral and Normal Force-Displacement Curves for Flipchip Solder Joints
Published: 9/1/2001
Authors: Daniel Wheeler, Daniel Josell, James A Warren, William E Wallace
Abstract: We present the results of experiments and modeling of flip-chip geometry solder joint shapes under shear loading. Modeling, using Surface Evolver, included development of techniques that use an applied vector force (normal and shear loading) as inpu ...

68. Polymer Chain Relaxation: Surface Outpaces Bulk
Published: 7/1/2001
Authors: William E Wallace, Daniel A Fischer, K Efimenko, Wen-Li Wu, Jan Genzer
Abstract: In this work we show how carbon near-edge X-ray absorption fine structure (NEXAFS) can be applied to detect both surface and bulk segmental relaxation in uniaxially deformed polystyrene samples. We demonstrate that by simultaneously monitoring the p ...

69. MALDI MS of Saturated Hydrocarbon Polymers: Polyethylene and Other Polyolefins
Published: 5/1/2001
Authors: William E Wallace, Charles Martin Guttman, B M Fanconi, Barry J. Bauer
Abstract: 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. ...

70. Surface Analysis Studies of Yield Enhancements in Secondary Ion Mass Spectrometry by Polyatomic Projectiles
Published: 5/1/2001
Authors: E Fuoco, John G Gillen, M Wijesundara, William E Wallace, L Hanley
Abstract: In this paper examine the mechanism of secondary ion yield enhancements previously observed for polyatomic projectiles by measuring the weight loss, volume loss, and surface composition of poly(methylmethacrylate) (PMMA) films sputtered by keV SF^d5^ ...

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