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You searched on: Topic Area: Polymers

Displaying records 481 to 490 of 554 records.
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481. Surface Morphology Variations in MALDI-TOF-Mass Spectrometry Samples Prepared by Various Techniques Examined by Scanning Electron Microscopy
Topic: Polymers
Published: 6/1/2000
Authors: William R. Blair, Charles Martin Guttman, A A Guiseppetti
Abstract: Continuing interest at NIST (National Institute of Standards and Technology) in producing MALDI (Matrix Assisted Laser Desorption/Ionization) analyses with a mimimum of sample to sample signal variation has led to the comparison of hand spotting, spi ...

482. Effect of Water Exposure Cycles on Physical Properties of a Partical-Filled, Epoxy-Based Adhesive
Topic: Polymers
Published: 5/1/2000
Authors: Martin Y Chiang, M Fernandez-Garcia, E M Yorkgitis
Abstract: The effect of cyclic hygrothermal aging on a particle-filled, epoxy-based adhesive was studied using a sequence of water absorption, desorption and reabsorption at different temperatures. Moisture sorption characteristics were explored by measuring t ...

483. MALDI-TOF MS Analysis of a Library of Polymerizable Cyclodextrin Derivatives
Topic: Polymers
Published: 4/1/2000
Authors: Rafael L. Bowen, M Farahani, Sabine Hilla Dickens, Charles Martin Guttman
Abstract: Polymerizable cyclodextrin derivatives (PCDs) have been proposed as candidates for use in dental therapeutics (Bowen, 1996 and Bowen and Reed, 1997). Here PCD libraries were synthosized by quasi-random reactions of 6 moles of methacrylic anhydride pl ...

484. Physical Aging of Amorphous PEN: Isothermal, Isochronal and Isostructural Results
Topic: Polymers
Published: 4/1/2000
Authors: M L Cerrada, G B. McKenna
Abstract: The viscoelastic and physical aging responses have been analyzed for an amorphous poly(ethylene naphthalate) (PEN) using uniaxial tension stress relaxation experiments. It is known that PEN exhibits a strong {beta} relaxation that overlaps the {alp ...

485. Polymer Division Technical Activities - 1999
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6435
Topic: Polymers
Published: 4/1/2000
Authors: Eric J. Amis, B M Fanconi
Abstract: Technical activities of the Polymers Division, 854, for the 1999 fiscal year are described. The report is organized by programs: Electronic Packaging, Interconnection and Assembly; Polymer Blends and Processing; Polymer Composites; Polymer Characte ...

486. A Direct Comparison of SANS and DET for Polymer Diffusion During Polystyrene Latex Film Formation
Topic: Polymers
Published: 3/1/2000
Authors: S D Kim, E M Boczar, Barry J. Bauer, A Klein, L H Sperling
Abstract: Polystyrene latex film is a model system for the study of interdiffusion in polymers. Small-angle neutron scattering (SANS) and a direct nonradiative energy transfer technique (DET) are widely used to study the interdiffusion of polymers in latex fil ...

487. Determination of the Molecular Mass Distribution of Narrow Polydispersity Polystyrene by MALDI-TOF-MS: Interlaboratory Comparison
Topic: Polymers
Published: 3/1/2000
Authors: Kathleen M. Flynn, S Wetzel, William E Wallace III, William R. Blair, R J Goldschmidt, David Lloyd VanderHart, B M Fanconi
Abstract: NIST has sponsored a matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) interlaboratory comparison using a well-characterized polystyrene to determine the reproducibility in determining the molecular mass dis ...

488. Fluorescence Anisotropy Sensor and Its Application to Polymer Processing and Characterization
Topic: Polymers
Published: 3/1/2000
Authors: Anthony J. Bur, S C Roth, C L Thomas
Abstract: An optical sensor containing polarizing optical components has been constructed for the purpose of monitoring fluorescence anisotropy during polymer processing and for carrying out remote sensing of polymer products doped with fluorescent dyes. The ...

489. MALDI-TOF Mass Spectrometry of Polymeric Silsesquioxanes
Topic: Polymers
Published: 3/1/2000
Authors: William E Wallace III, Charles Martin Guttman, Joseph M Antonucci
Abstract: Matrix-assisted laser desorption ionization time-of-flight mass spectrometry has been shown to be an effective method to determine the degree-of-intramolecular-condensation of polymeric silsesquioxanes. The nature of the organic R' leaving group wa ...

490. Polymeric Silsesquioxanes: Degree-of-Intramolecular-Condensation Measured by Mass Spectrometry
Topic: Polymers
Published: 3/1/2000
Authors: William E Wallace III, Charles Martin Guttman, Joseph M Antonucci
Abstract: The degree-of-condensation, defined as the number of residual silanol (SiOH) groups per oligomer, for a variety of silsesquioxane polymers was measured by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Condensation of ...

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