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Displaying 1676 - 1700 of 1739

Application of Neutron Interferometry to the Measurement of Thin Film Density

January 1, 1999

Author(s)

William E. Wallace, David L. Jacobson, Muhammad Arif, A I. Ioffe

The application of neutron interferometry to the measurement of the atom density of polymer thin films (

Assessment of Particle Size Measurement Techniques and Procedures: I. Identification and Characterization of a Model Powder System

January 1, 1999

Author(s)

Ajitkumar Jillavenkatesa, Vincent A. Hackley, G Y. Onoda

Particle size distribution of a powder system has been observed to be dependent upon the instrument and technique used for analysis. Often, different instruments based upon the same fundamental principle give different results for the same powder. This

Ceramics 1998 Programs and Accomplishments

January 1, 1999

Author(s)

Stephen W. Freiman

The mission of the Ceramics Division can be stated as follows:Work with industry, standards bodies, academia, and other government agencies in providing the leadership for the Nation's measurements and standards infrastructure for ceramic materials.The

Comparison of Classical and MALDI-TOF-MS Analysis of a Polystyrene Interlaboratory Sample

January 1, 1999

Author(s)

William R. Blair, B M. Fanconi, R J. Goldschmidt, Charles M. Guttman, William E. Wallace, S Wetzel, David L. VanderHart

Over the past several years, the use of MALDI-TOF-MS for analysis of synthetic polymers has increased significantly. As the number of polymer analyses by MALDI has increased, scrutiny of the MALDI results in comparison to classically derived values for Mw

Domain Structure and Interphase Dimensions in Poly(Urethaneurea) Elastomers Using DSC and SAXS

January 1, 1999

Author(s)

S G. Musselman, T M. Santosusso, J D. Barnes, L H. Sperling

Small-angle x-ray scattering (SAXS) and differential scattering calorimetry (DSC) were used to demonstrate distinct differences in domain size, phase separation, and hydrogen bonding in a series of segmented urethaneurea elastomers prepared from isocyanate

Domain Structure and Interphase Dimensions in Poly(Urethaneurea) Elastomers Using DSCand SAXS

January 1, 1999

Author(s)

S G. Musselman, T M. Santosusso, J D. Barnes, L H. Sperling

In-Line Dielectric Sensor for Chemical Composition Measurements in Molten Polymers

January 1, 1999

Author(s)

M M. McBrearty, Anthony J. Bur, S Perusich

We describe a dielectric sensor that incorporates a flow-through design so that it can be placed in-line on an extruder. Dielectric measurements have been successfully applied for measuring additive concentrations in polymer melts during extrusion

Living Poly(Alpha-Methylstyrene) Near the Polymerization Line. Vii. Molecular Weight Distribution in a Good Solvent

January 1, 1999

Author(s)

S S. Das, J Zhuang, A P. Andrews, S C. Greer, Charles M. Guttman, William R. Blair

Measurement of Thermal Conductivity Using Tmdsc: Solution to the Heat Flow Problem

January 1, 1999

Author(s)

S L. Simon, G B. McKenna

Mechanical and Swelling Behaviors of Rubber: a Comparison of Some Molecular Models With Experiment

January 1, 1999

Author(s)

W H. Han, F Horkay, G B. McKenna

Network Structure of Bimodal Epoxies - a Small Angle X-Ray Scattering Study

January 1, 1999

Author(s)

N C. BeckTan, Barry J. Bauer, J Plestil, J D. Barnes, Da-Wei Liu, L Matejka, K Dusek, Wen-Li Wu

Optical Absorption, Raman, and Photoluminescence Excitation Spectroscopy of Inhomogeneous InGaN Films

January 1, 1999

Author(s)

Lawrence H. Robins, Albert J. Paul, C A. Parker, J C. Roberts, S M. Bedair, E L. Piner, N A. El-Masry

In xGa 1-xN films with x=0.06 to x=0.49 were characterized by optical transmittance, Raman, and photoluminescence excitation spectroscopies. Previous microstructural characterizations detected phase separation only in films with x>0.2. The transmittance

Orientation Texture from Polymeric Materials Using Scattering Methods

January 1, 1999

Author(s)

J D. Barnes

Polymeric Materials Interest Group Workshop: Quantitative Determination of Synthetic Polymer Molecular Mass Distribution

January 1, 1999

Author(s)

William E. Wallace

Preliminary report on the NIST molecular mass distribution interlaboratory comparison.

Small-Angle Neutron Scattering of Solutions of Arborescent Graft Polystyrenes

January 1, 1999

Author(s)

S M. Choi, R M. Briber, Barry J. Bauer, A Topp, M Gauthier, L Tichagwa

Spin-on-Glass Thin Films Prepared From a Novel Polysilsesquioxane by Thermal and Ultraviolet-Irradiation Methods

January 1, 1999

Author(s)

Q Pan, G B. Gonzalez, R J. Composto, William E. Wallace, B Arkles, L K. Figge, D H. Berry

The pyrolytic and photolytic conversion of a new polymer precursor, namely -chloroethyl-silsesquioxane (BCESSQ), to an ormosil film is presented. At 350 C the film thickness rapidly decays to 55% of its original thickness within 60 min. A range of ion

Statistical Analysis of NIST Interlaboratory Comparison of Polystyrene Molecular Mass Distribution Obtained by MALDI TOF MS

January 1, 1999

Author(s)

S Wetzel, Charles M. Guttman, Kathleen M. Flynn

Stress Relaxation of Poly(Ethylene Naphthalate): Isothermal, Isochronal, and Isostructural Responses

January 1, 1999

Author(s)

M L. Cerrada, G B. McKenna

Study of Aggregates of Fullerene-Based Ionomers in Aqueous Solutions Using Small Angle Neutron and X-ray Scattering

January 1, 1999

Author(s)

U Jeng, T L. Lin, C S. Tsao, C H. Lee, T Canteenwala, L Y. Wang, L Y. Chiang, Charles C. Han

The Effects of Steady Shear on the Order and Orientation of a Diblock Copolymer Melt using In-Situ Small-Angle Neutron Scattering

January 1, 1999

Author(s)

K A. Barnes, F A. Morrison, A Nakatani, J W. Mays

Standardization of Fracture Toughness Testing of Ceramics in the United States

December 30, 1998

Author(s)

George D. Quinn

American Society for Testing and Materials (ASTM) standard test method PS 070 has been created for fracture toughness of advanced ceramics. It includes three test methods which use beams in bending: chevron notch (CNB), single-edged precracked beam (SEPB)

Indentation Creep Behavior of a Direct-Filling Silver Alternative to Amalgam

December 1, 1998

Author(s)

Hockin D. Xu, Kate Liao, F Eichmiller

Amalgam creep has been identified as a key parameter associated with marginal breakdown and corrosion. Recently, a consolidated silver powder was proposed as a mercury-free alternative to amalgam. The aim of the present study was to characterize the time

Evolution of Microstructure in the Liquid and Crystal Directions in a Quenched Block Copolymer Melt and Its Implication on Phase Transition Mechanisms

November 1, 1998

Author(s)

N P. Balsara, B A. Garetz, M C. Newstein, Barry J. Bauer, T J. Prosa

Evolution of the disorder-to-order transition within a block copolymer is studied by the thermal quenching of samples from the melt to an ordered state. The ordered state consists of cylinders arranged on a hexagonal lattice and has liquid crystalline

Molecular Structure of Silsesquioxanes Determined by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

November 1, 1998

Author(s)

William E. Wallace, Charles M. Guttman, Joseph M. Antonucci

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry was used to deduce the three-dimensional structure of a complex silsesquioxane polymer. Four distinct levels of structure were observed in the mass spectrum. The overall shape of

The Surface Area of Cement Paste as Measured by Neutron Scattering -- Evidence for Two C-S-H Morphologies

October 1, 1998

Author(s)

J Thomas, Hamlin M. Jennings, Andrew J. Allen

Small-angle neutron scattering was used to measure the effect of water-to-cement ratio [w/c] and cement batch variation on the surface area of ordinary Portland cement [opc] paste after hydration for 28 days at room temperature, and to measure the

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