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You searched on: Author: william wallace

Displaying records 21 to 30 of 95 records.
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21. Reactive MALDI Mass Spectrometry: Application to High Mass Alkanes and Polyethylene
Published: 8/21/2007
Author: William E Wallace
Abstract: A molecular solid of fullerene (C60) intercalated with cobalt cyclopentadienyl dicarbonyl (CoCp(CO)2) was shown to be an effective matrix for matrix-assisted laser desorption/ionization mass spectrometry (MALDI) of large alkanes (demonstrated up to C ...

22. Degradation of Polymeric Ballistic Materials
Published: 6/7/2007
Authors: Eun S. Park, Kathleen M. Flynn, Gale Antrus Holmes, Charles Martin Guttman, William E Wallace

23. Numerical Optimization of Matrix-Assisted Laser Desorption/Ionization Time-of- Flight Mass Spectrometry: Application to Synthetic Polymer Molecular Mass Distribution Measurement
Published: 5/26/2007
Authors: William E Wallace, Charles Martin Guttman, Kathleen M. Flynn, Anthony J Kearsley
Abstract: A novel approach is described for the selection of optimal instrument parameters that yield a mass spectrum which best replicates the molecular mass distribution of a synthetic polymer. The application of implicit filtering algorithms is shown to be ...

24. Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry of Covalently-Cationized Polyethylene as a Function of Sample Temperature
Published: 1/1/2007
Authors: William E Wallace, William R. Blair
Abstract: A pre charged, low mass, low polydispersity linear polyethylene was analyzed with matrix assisted laser desorption/ionization (MALDI) mass spectrometry as a function of sample temperature between 25 C and 150 C. This temperature range crosses the ...

25. Development of NIST SRM 2881, an Absolute Molecular Mass Distribution Polymer Standard
Published: 9/1/2006
Authors: William E Wallace, Charles Martin Guttman, Kathleen M. Flynn, Anthony J Kearsley
Abstract: We present a strategy to create an absolute molecular mass distribution polymer Standard Reference Material. To create a standard our methods must be free of operator bias (intentional or unintentional). The steps include sample preparation, instrume ...

26. Report on the 4th Annual NIST Polymer Mass Spectrometry Workshop: Future Directions in Soft Ionization of Polymers
Published: 1/10/2006
Author: William E Wallace
Abstract: This year s annual workshop on polymer mass spectrometry was on the topic of Future Directions in Soft Ionization of Polymers . The workshop was sponsored by the Polymers Division of the National Institute of Standards and Technology (NIST) and fol ...

27. Report On The 4Th Annual Nist Polymer Mass Spectrometry Workshop: 'Future Directions In Soft Ionization Of Polymers'
Published: 1/1/2006
Author: William E Wallace

28. Investigating the Environmental Stability of Ballistic Fibers Using Model Compounds and Mass Spectrometry
Published: 9/1/2005
Authors: Kathleen M. Flynn, William E Wallace, Charles Martin Guttman, Gale Antrus Holmes, Mark Arnould
Abstract: Metrologies and predictive models to test and predict the long-term reliability of polymers used in ballistic resistant armor are presented.

29. Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Interlaboratory Comparison of Mixtures of Polystyrene With Different End Groups: Statistical Analysis of Mass Fractions and Mass Moments
Published: 7/1/2005
Authors: Charles Martin Guttman, S Wetzel, Kathleen M. Flynn, B M Fanconi, David Lloyd VanderHart, William E Wallace
Abstract: A matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) interlaboratory comparison was conducted on mixtures of synthetic polymers having the same repeat unit and closely matching molecular mass distributions but ...

30. 2,5-Dihydroxybenzoic Acid: Laser Desorption/Ionisation as a Function of Elevated Temperature
Published: 3/1/2005
Authors: William E Wallace, Mark Arnould, R Knochenmuss
Abstract: The temperature dependence of laser desorption/ionization (LDI) ion yields has been measured for 2,5-dihydroxybenzoic acid (2,5-DHB) single crystals from room temperature to 160 C using time-of-flight mass spectrometry. A steep rise in ion producti ...

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