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Topic Area: Polymers

Displaying records 511 to 520 of 546 records.
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511. Small Angle Neutron Scattering of Solutions of Arborescent Graft Polymers
Topic: Polymers
Published: 11/1/1999
Authors: S M Choi, R M Briber, Barry J. Bauer, A Topp, M Gauthier, L Tichagwa
Abstract: Small angle neutron scattering was used to measure the size and shape of arborescent graft polymers as a function of generation number in solution. The radius of gyration of arborescent graft polymers was found to be almost independent of temperatur ...

512. Time-Domain Dielectric Spectroscopy Analysis of the Amorphous Phase in Semicrystalline Polycarbonate
Topic: Polymers
Published: 8/1/1999
Authors: Chad R Snyder, F I. Mopsik, H Marand, S M Sohn
Abstract: The amorphous state of bisphenol-A polycarbonate was examined by time-domain dielectric spectroscopy as a function of crystallization time over a frequency range of 1 x 10^u-4^ Hz to 1 x 10^u4^ Hz. The dielectric measurements were performed in the te ...

513. Molecularly Dispersed Dendrimers in a Polymeric Matrix
Topic: Polymers
Published: 3/1/1999
Authors: Barry J. Bauer, T J. Prosa, D W. Liu, C L. Jackson, D A Tomalia, Eric J. Amis
Abstract: Interpenetrating polymer networks are formed by dissolving poly(amidoamine) dendrimers in 2-hydroxyethyl methacrylate and polymerizing with dendrimer contents between 1 and 25 mass % containing dendrimers from generation 6 through 11. Small angle x- ...

514. Comparison of Classical and MALDI-TOF-MS Analysis of a Polystyrene Interlaboratory Sample
Topic: Polymers
Published: 1/1/1999
Authors: William R. Blair, B M Fanconi, R J Goldschmidt, Charles Martin Guttman, William E Wallace III, S Wetzel, David Lloyd VanderHart
Abstract: 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 ...

515. Domain Structure and Interphase Dimensions in Poly(Urethaneurea) Elastomers Using DSC and SAXS
Topic: Polymers
Published: 1/1/1999
Authors: S G Musselman, T M Santosusso, J D. Barnes, L H Sperling
Abstract: 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 isoc ...

516. Domain Structure and Interphase Dimensions in Poly(Urethaneurea) Elastomers Using DSCand SAXS
Topic: Polymers
Published: 1/1/1999
Authors: S G Musselman, T M Santosusso, J D. Barnes, L H Sperling

517. Fluorescence Anisotropy Measurements of Oriented Polymers
Topic: Polymers
Published: 1/1/1999
Authors: Anthony J. Bur, S C Roth

518. Generation of Different UHMWPE Particle Shape by Wear Through Surface Texturing
Topic: Polymers
Published: 1/1/1999
Authors: H. W. Fang, M C Shen, U Cho, John A Tesk, A Christou, Stephen M. Hsu

519. In-Line Dielectric Sensor for Chemical Composition Measurements in Molten Polymers
Topic: Polymers
Published: 1/1/1999
Authors: M M McBrearty, Anthony J. Bur, S Perusich
Abstract: 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 p ...

520. In-Situ Monitoring of Product Shrinkage During Injection Molding Using an Optical Sensor
Topic: Polymers
Published: 1/1/1999
Authors: C L Thomas, Anthony J. Bur
Abstract: We have used an optical fiber sensor for in-situ monitoring of product shrinkage during injection molding. The sensor, consisting of a bundle of optical fibers with a sapphire window at its end, is positioned in the ejector pin channel of the mold s ...

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