Publications

Displaying 76 - 100 of 136

Structure and Mechanical Properties of Poly(D,L-lactic acid)/Poly(e-caprolactone) Blends

January 1, 2003

Author(s)

M E. Broz, David L. VanderHart, N. R. Washburn

MALDI MS Characterization of Covalent Cationized Polyethylene

August 1, 2002

Author(s)

Sheng Lin-Gibson, D L. Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Kathleen M. Flynn, William E. Wallace

Polyolefins, saturated hydrocarbon polymers such as polyethylene (PE) and polypropylene, are, by production volume, the most widely used of all A new method for the mass spectrometry of saturated polyolefins whereby an organic cation is covalently bonded

Optimizing the Covalent Cationization Method for the Mass Spectrometry of Polyolefins

August 1, 2002

Author(s)

Sheng Lin-Gibson, L Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Charles M. Guttman, William E. Wallace

Previously a new method was introduced for the mass spectrometry of polyolefins whereby an organic cation is covalently bonded to the polymer to produce the necessary ionization for the creation of intact gas?phase macromolecules by matrix-assisted laser

Accelerated Light-Induced Aging of A-, B-, and G- 13 C-Enriched Cell Wall-Dehydrogenation Polymers Studied With Solid State 13 C NMR spectroscopy

January 1, 2002

Author(s)

J Parkas, David L. VanderHart, U Westermark

Light-induced aging of lignocellulosic materials has been studied with a new technique involving selectively alpha-, beta-, and gamma-13C-enriched cell wall-dehydrogenation polymers (CW-DHP:s) and solid state 13C NMR spectroscopy. The results from cross

Accelerated Light-Induced Aging of Alpha-, Beta-, and Gamma-C- 13-Enriched Cell Wall-Dehydrogenation Polymers Studied With Solid State C-13 Nmr Spectroscopy

January 1, 2002

Author(s)

J Parkas, M Paulsson, David L. VanderHart, U Westermark

MALDI MS Characterization of Cationized Covalent Polyethylene

January 1, 2002

Author(s)

Sheng Lin-Gibson, L Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Charles M. Guttman, William E. Wallace

Nondestructive Analysis of Lignin Structure by NMR Spectroscopy of Specifically 13C-Enriched Lignins I: Solic State Study of Ginkgo Wood

January 1, 2002

Author(s)

N Terashima, J Hafren, U Westermark, David L. VanderHart

Guaiacyl-type lignin is the major component of ginkgo lignin. Specific 13C-enrichment of alpha, beta and gamma-carbons of the guaiacylpropane side chains was achieved by administration of coniferin-[alpha-13C], coniferin-[beta-13C] and coniferin-[gamma-13C

Nondestructive Analysis of Lignin Structure by NMR Spectroscopy of Specifically C-13-Enriched Lignins Part 1. Solid State Study of Ginkgo Wood

January 1, 2002

Author(s)

N Terashima, J Hafren, U Westermark, David L. VanderHart

Optimization of the Covalent Cationization for the Mass Spectrometry of Polyolefins

January 1, 2002

Author(s)

Barry J. Bauer, Sheng Lin-Gibson, L Brunner, David L. VanderHart, B M. Fanconi, Charles M. Guttman, William E. Wallace

Solid State NMR Investigation of Paramagnetic Nylon-6 Clay Nanocomposites 1. Crystallinity, Morphology, and the Direct Influence of Fe 3+ on Nuclear Spins

October 1, 2001

Author(s)

David L. VanderHart, A Asano, Jeffrey W. Gilman

Several exfoliated nylon-6/clay nanocomposites (NnCs) were investigated and compared with pure nylon-6 using solid state NMR, both proton and 13C. NnCs had nominally 5 mass percent clay and were generated both by blending and by in-situ-polymerization (IsP

Solid State NMR Investigation of Paramagnetic Nylon-6 Clay Nanocomposites 2. Measurement of Clay Dispersion, Crystal Stratification and Stability of Organic Modifiers

October 1, 2001

Author(s)

David L. VanderHart, A Asano, Jeffrey W. Gilman

In this second paper of a 2-part series dealing mainly with NMR characterization of nylon-6/clay nanocomposites (NnCs) having nominally 5 mass percent clay, measurements with application to processing are featured. The paramagnetism of the montmorillonite

NMR Measurements Related to Clay-Dispersion Quality and Organic-Modifier Stability in Nylon-6/Clay Nanocomposites

June 1, 2001

Author(s)

David L. VanderHart, A Asano, Jeffrey W. Gilman

Solid state NMR measurements have been made on pure nylon-6 as well as 4 nylon-6/clay nanocomposites containing paramagnetic clays. The paramagnetic character of the clay shortens proton longitudinal relaxation times, T1H, owing to the non-stoichiometric

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

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