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  • Polymer and Materials Science  (1,882)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE
  • 1980-1984  (1,206)
  • 1975-1979  (934)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Raman spectra and normal vibrations of dipeptides. II. Glycyl-L-proline (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 1285-1300 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Raman and ir spectra of the glycyl-L-proline (GP) dipeptide were recorded. A normal-coordinate treatment was performed on the basis of the experimental spectra, using a modified Urey-Bradley force field (MUBFF). Cyclic redundancies were eliminated, and those due to the ring methylene groups, particularly distorted in regard to the tetrahedral conformation, were treated. An assignment of the experimental frequencies is proposed on the basis of the normal treatment.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360220504
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  • 2
    Electronic Resource
    Electronic Resource
    Phase separation by synthesis of semi-interpenetrating network on the basis of polystyrene and poly(butyl methacrylate) from homogeneous solution (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 347-351 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Phase separation by semi-interpenetrating polymeric network formation based on the copolymer styrene-divinylbenzene (PS-DVB) and poly(butyl methacrylate) (PBMA) was investigated by light scattering. The time for phase separation was measured as a function of the rate of the copolymerization reaction and of the composition of the initial blend. The time until the outset of phase separation decreases with increasing content of PBMA in the blend. The change in concentration of DVB does not influence the process of phase separation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850211
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  • 3
    Electronic Resource
    Electronic Resource
    Corrosion fatigue behaviour of nitrogen-implanted steel in water (1980)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 783-789 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Schwingungskorrosionsverhalten von nitriertem Stahl in WasserDas Schwingungskorrosionsverhalten von nitriertem Stahl in neutralen Lösungen wurde unter Verwendung von schwingenden, einseitig eingespannten Proben (cantilever beam method) elektrochemisch (Ekorr/Zeit, Rp-Messung) und mittels Rasterelektronenmikroskopie untersucht.Die Korrosionsgeschwindigkeit in stagnierenden Flüssigkeiten ist bei dem nitrierten Stahl, unabhängig von der Stickstoffkonzentration, niedriger als bei unbehandeltem Stahl; die an der Oberfläche entstehenden Oxidschichten besitzen deutlich bessere Schutzwirkung.Bei einer zyklischen Belastung (25,4 kg/mm-2, 16,6 Hz) ist die Rißauslösung verzögert. Die Zeit bis zum Bruch ist beträchtlich kürzer als bei nicht nitrierten Proben (zumindest unter den verwendeten Versuchsbedingungen). Die Erhöhung der Rißausbreitungsgeschwindigkeit läßt sich erklären durch die Gefügeschädigungen, die durch das Nitrieren hervorgerufen werden. Die Bruchmorphologie wird ebenfalls erörtert.
    Notes: The corrosion fatigue behaviour of nitrogen implanted iron in neutral solutions has been investigated utilizing the oscillating cantilever beam method, by means of electrochemical (Ecorr vs. time plots, Rp measurements) and S. E. M. techniques.The calculated corrosion rate under stagnant conditions is lowered for the implanted iron at all nitrogen doses with respect to untreated iron. The surface oxide layers achieve enhanced protecting capacity.Consequently under a cyclic load of 25.4 kg mm-2, at a frequency of 16.6 Hz, cracks nucleation is delayed. The time to breaking of implanted specimens is considerably lower in our experimental conditions compared to untreated iron. The increase in the crack growth rate is consistent with the detrimental action of structural damage following implantation. The fracture morphology is also discussed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19800311006
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  • 4
    Electronic Resource
    Electronic Resource
    Condensation of Co++ ions on chondroitin sulfate from transport coefficients and proton NMR measurements in aqueous solutions (1979)
    New York : Wiley-Blackwell
    Biopolymers 18 (1979), S. 1849-1857 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The “condensed” counterions which characterize high-charge-density polyelectrolyte solutions can be analyzed into two subpopulations: (1) site-bound counterions and (2) atmospherically entrapped counterions. The distinction is achieved experimentally by combining the data from self-diffusion coefficient or electrical mobility measurements, which give the amount of “condensed” ions, and those from nmr, chemical shift measurements, which indicate the amount of site-bound ions. In the case of a solution of chondroitin sulfate with excess Co++ counterions, it can be estimated that 20% of the structural charge of the polyion is neutralized by site-bound, dehydrated, condensed counterions, while a further 30% is neutralized by atmospherically entrapped, hydrated counterions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1979.360180803
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  • 5
    Electronic Resource
    Electronic Resource
    Separation of dextrans by gel permeation chromatography (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 2147-2155 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The role of the intrinsic viscosity [η] as separation parameter in gel permeation chromatography (GPC) was studied for dextrans (from Leuconostoc mesenteroids B512) dissolved in water with deactivated silicagel (Porasil) as the column-filling material. For that purpose specific viscosities of dextran fractions eluted by GPC were measured as a function of the elution volume v. Provided that the elution volumes are corrected for zonal spreading, they are related to the intrinsic viscosities in an unambiguous way, probably reflecting a unique relationship between degree of branching and molecular weights. This was further investigated by developing an iteration method to prepare two calibration curves γ(v) and g(v), respectively, relating ln[\documentclass{article}\pagestyle{empty}\begin{document}$\left[ {\bar \eta } \right]$\end {document}] and InM (M is the molecular weight) to v. It required that the weight-average molecular weight Mw, the number-average molecular weight Mn, and the average intrinsic viscosity [\documentclass{article}\pagestyle{empty}\begin{document}$\left[ {\bar \eta } \right]$\end {document}] for a number of dextran samples (broad distributions) be previously known. The calibration curves found lead to consistent values of the above-mentioned averages. Moreover, they allow-establishment of the [\documentclass{article}\pagestyle{empty}\begin{document}$\left[ {\bar \eta } \right]$\end {document}]-M relationship over the range 5000 〈 M 〈 500,000.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180161205
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  • 6
    Electronic Resource
    Electronic Resource
    Methods for the determination of the number of polytetrahydrofuran branches in neoprene-g-polytetrahydrofuran (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2021-2031 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methods for the determination of the number of the number of polytetrahydrofuran branches in neoprene-g-polytetrahydrofuran were examined. Only two suitable methods were found; namely, termination of oxonium ions by triphenylphosphine followed by 31P-NMR and termination with NH4OH—NH4Cl buffer and reaction with fluorescamine followed by fluorescence spectroscopy. Both methods led to the conclusion that Neoprene W has 9 ± 1 active halogens per mole that can be used to initiate tetrahydrofuran polymerization when silver salts are added. Among the methods examined in this study the fluorescence method was the most reliable, most reproducible, fastest, and simplest.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180637
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of secondary hydroxyl-terminated telechelic polybutadiene prepolymers using a new azobisnitrile initiator (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 3591-3595 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170211219
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  • 8
    Electronic Resource
    Electronic Resource
    Solvent accessibilities in the dimeric subunits of RNA and DNA (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 2503-2518 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: To obtain information on the solvent-solute interactions in the dinucleoside monophosphates pertaining to the dimeric subunits of RNA and DNA, we have computed the accessibility of a water molecule to the oxygen atoms of the subunits following the method of Lee and Richards [J. Mol. Biol. 55, 379-400 (1971)]. The solute molecules (dimeric unit) is represented by a set of interlocking spheres of appropriate van der Waals radii assigned to each atom, a solvent (water) molecule is rolled along the envelope of the van der Waals surface, and the total surface accessible to the solvent molecule - and hence the solvent accessibility of various atoms of the solute molecule for different conformations - are computed. From the calculated atomic accessibilities, solvation maps in the (ω′,ω) space have been constructed, keeping ψ at 60°, 180°, and -60°. The C(3′)-endo sugar system in the case of DNA subunit have been considered. The solvation maps describing the solvatability of single and groups of atoms give significant information on the backbone conformational domains that are preferred for solvent interaction, thus adding knowledge to the relative stability of the various possible conformations. The B-DNA-type conformer exposes three polar atoms - namely, PO1, O(3′), and O(1′) - to external solvent, whereas the A-DNA- and C-DNA-type conformers expose only one polar atom - O(3′) and O(1′), respectively - to the solvent. The O(2′) atom of the furanose ring system in the RNA subunit could give added stability via solvent association or interunit hydrogen bonding with or without a bridging water. The superposition solvation maps describing the accessibility of a group of polar atoms help to interpret a good number of phosphodiester conformations observed in a energetically less favored conformational domains in the tRNAPhe crystal. Another intresting fact that results from this study is the prediction that the trans oriented of ω is the most favorable conformations of random-coil polynucleotides in solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360171016
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of the strongly held water of myoglobin by drying (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 1957-1972 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The karl Fischer reagent method has been used to study the drying of whale skeletal muscle myoglobin. Drying curves for metmyglobin were obtained by mechanical pumping (moderate vacuum) and diffusion pumping (high vacum) at 20, 10, 0, -10, and -20°C. Strongly held water is present in about the same amounts as were previously observed with lysozyme. Nearly all of this strongly held water is still present during the drying of acid denatured metmyoglobin. This suggest that a core structure containing strongly held water is still present at pH 4.0. Comparison of the drying of metmyoglobin, deoxymyoglobin, and oxymyoglobin indicates that the iron-coordinated water of methyoglobin is the second most strongly held water of the molocule.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360170811
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  • 10
    Electronic Resource
    Electronic Resource
    Early stages of fibrinogen to fibrin conversion studied by static and dynamic light scattering (1981)
    New York : Wiley-Blackwell
    Biopolymers 20 (1981), S. 2035-2049 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The early steps of fibrin aggregation induced by low Reptilase concentrations were studied by means of static and dynamic light scattering. In order to obtain information on the size and shape of the first oligomers, the angular dependence of the scattered intensity and the mean Rayleigh line width were measured. Under physiological pH and ionic strength, oligomer formation was detectable immediately after enzymatic activation. Comparison of the calculated data for different models with experimental results shows that the early fibrin polymerization proceeds as an end-to-end aggregation of elongated and possibly flexible molecules approximately 75 nm long.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1981.360201002
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