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  • Polymer and Materials Science  (14)
  • 1
    Digitale Medien
    Digitale Medien
    Synthesis of the acetylacetone telechelate of polydimethylsiloxane and its gelation with Cr(III) and Fe(III) (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 559-571 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The batch synthesis of acetylacetone end-capped polydimethylsiloxane is described. Efforts to end-link the telechelic polymer with several simple metal salts yielded poorly gelled systems, except for the cases where FeCl3 and CrCl3 · 3THF were used. With these salts, low but nonetheless appreciable, gel fractions of 45 and 40%, respectively, were obtained. The difficulty experienced in obtaining high gel fractions is traced to incomplete ligand exchange reactions in low polarity media.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1990.080280308
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  • 2
    Digitale Medien
    Digitale Medien
    Analysis of reaction-injection-molded polyurethanes by near-infrared diffuse reflectance spectroscopy (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2169-2190 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The ability of near-infrared (NIR) diffuse reflectance spectroscopy to characterize reaction-injection-molded (RIM) polyurethane elastomers is demonstrated. The advantage of NIR spectroscopy over other analytical methods is its ability to analyze samples without any preparation. In this work, the specific effects of composition, density, phase separation, and moisture content on the NIR spectra of the polymers are identified. In addition, the ability of NIR spectroscopy to make rapid assessments of physical properties, such as heat sag and flex modulus, is demonstrated. In order to perform these analyses, the multivariate statistical methods of principal components analysis (PCA) and partial least squares (PLS) are used.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070420807
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  • 3
    Digitale Medien
    Digitale Medien
    Small angle X-ray scattering functions for aggregates of globular proteinsSupported in part by the National Science Foundation. (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 51 (1976), S. 61-68 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Abhängigkeit der Streulichtintensität vom Winkel wurde für sechs Rotationsellipsoide in D6h-Symmetrie erhalten. Die Streufunktionen zeigen auffallende Plateaus bei kleinen Winkeln. Diese besondere Erscheinung in Streufunktionen für Aggregate dürfte für das Auffinden eines Hohlraums in aggregierten globularen Proteinen und zur Verfeinerung der Gestaltanalyse hilfreich sein.
    Notizen: An expression for the angular dependence of the intensity of radiation scattered from six ellipsoids of revolution arranged in D6h symmetry is obtained. The scattering functions exhibit unique plateau regions for small angles. This peculiar feature of the scattering functions for aggregates may be of some aid in detecting a hole in globular proteins and in refining shape analyses of aggregated globular proteins.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1976.050510106
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  • 4
    Digitale Medien
    Digitale Medien
    Existence of two critical concentrations in binary phase diagrams (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 635-637 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1991.090290514
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  • 5
    Digitale Medien
    Digitale Medien
    Simulations on radiation-cured polyethylene (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 595-602 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Simulations of the simultaneous crosslinking and chain scission reactions that are induced in bulk amorphous polyethylene by irradiation have been implemented with a computer. A detailed study of the various defect structures in the network is reported, to show that dangling ends have the highest population among these defects, especially at higher crosslink densities. The calculated sol fractions compare very favorably with previously published experimental studies. We find that there is about 1 chain scission for every 9 crosslinked units, i.e., one scission per 4.5 crosslinks. This is fewer scissions than had previously been deduced by application of the Charlesby-Pinner method.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1988.090260311
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  • 6
    Digitale Medien
    Digitale Medien
    Molecular weight and shape of the phycocyanin hexamer (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 2293-2304 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The hexamer of phycocyanin from Phormidium luridum has been isolated and purified by ammonium sulfate fractionation and gel chromatography. The protein is characterized by the sedimentation constant S°20, w = 10.2S, the diffusion coefficient D20, w = 4.73 × 10-7 cm2/sec, and intrinsic viscosity [η] = 3.89 ml/g. The molecular weight of the aggregate is 209,000. The shape and dimensions of the hexamer are discussed in terms of a model consisting of subunits arranged with C6 symmetry. The monomers, assumed to be spherical, are found to have a radius of 22 Å, and the diameter across the hexamer is 132 Å. The latter figure agrees closely with dimensions observed in electron micrographs.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1974.360131111
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  • 7
    Digitale Medien
    Digitale Medien
    Helix-coil transitions of compositionally heterogeneous DNA (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1357-1379 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Fragmented and mitomycin C cross-linked E. coli DNA was fractionated according to base composition by means of hydroxylapatite chromatography and density-gradient centrifugation in order to determine the effect of compositional heterogeneity on the breadth of the helix-coil transition. The transitions of some of the fractions are broader than that of the unfractionated DNA, due, presumably, to nonrandom sequences in molecules of 5 × 105 daltons. Analysis of the transition breadths in terms of the known heterogeneity leads to reconsideration of current DNA helix-coil transition theory. We propose that partially denatured states include those for which the chains do not remain in strict register. Denaturation profiles are comprehensible only if this multitude of entropically favorable, degenerate states is included in the theory.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1975.360140705
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  • 8
    Digitale Medien
    Digitale Medien
    Elasticity theory. IV. The stress-strain relation (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 59-72 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The stress-strain relation is analyzed in terms of the gyration tensor \documentclass{article}\pagestyle{empty}\begin{document}$$S^{\alpha \beta } = N^{ - 1} \sum\limits_{i - 1}^N {x_i^\alpha x_i^\beta } $$\end{document} where the sum is over all N atomic groups comprising the elastomeric material. All groups are taken for convenience to have the same mass. This tensor is linear in the strain, and furthermore it may be evaluated from a configuration integral. The definition of the strain by use of Sαβ gives new insight into the connection between statistical and continuum mechanics, and further clarifies the significance of “affine deformation.” Stress components are obtained as derivatives of the (Helmholtz) free energy A with respect to the invariants of Sαβ. The first invariant is just the radius of gyration S2 of the network, and the dependence of A on S2 alone provides a basis for analysis of stress-strain isotherms.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1975.180130106
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  • 9
    Digitale Medien
    Digitale Medien
    The gaussian chain with excluded volume (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1655-1658 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1975.180130817
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  • 10
    Digitale Medien
    Digitale Medien
    Vapor sorption isotherms for benzene and n-hepatane with poly(styrene-co-butadiene) (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 117-120 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Vapor sorption measurements of Flory-Huggins interaction parameters χ for three poly(styrene-co-butadiene) + solvent systems at 25°C are reported. For Philprene 1502 + benzene: χ = 0.379-0.297 v22; for Philprene 1502 + n-heptane: χ = 0.595 + 0.030 v2 for Solprene 1204 + benzene: χ = 0.516-0.026 v2. The volume for fractions of polymer v2 range from ca. 0.4 to 0.9.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1978.180160110
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