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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of a polymeric, water-soluble chelator for Fe(III) (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 21 (1983), S. 381-387 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; 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.1983.130210511
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure of cold fracture sections as an indication of changes in properties of injection-molded nylon polymersThis paper was read on the program of the Division of Paint, Plastics and Printing Ink Chemistry at the National Meeting of the American Chemical Society, Chicago, Illinois, September 1958. (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 3 (1960), S. 113-117 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The mechanical properties of injection-molded nylon 66, nylon 610, and nylon 6 can be altered significantly by steaming or heat-aging treatments which do not-appear to be severe enough to cause density changes which would suggest much of a shift in the ratio of crystalline to mesomorphic polymer. However, some electron microscopy studies have demonstrated that such treatments are reflected markedly in the microstructure of fracture patterns on test bars broken at -40°C. The greater the change in microstructure, the greater was the residual effect of thermal or steam aging on the shear modulus and damping characteristics of the polymer. In general, dry annealing promoted embrittlement, particularly at low temperatures. Residual effects of steaming enhanced embrittlement at -40 and 100°C. but promoted softening at room temperature. The relative stability of room-temperature properties to dry annealing was greatest for nylon 66, and to steaming for nylon 6.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1960.070030716
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  • 3
    Electronic Resource
    Electronic Resource
    A mean field theory for the swelling of a gaussian polyion (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Theory and Simulations 3 (1994), S. 79-90 
    Details
    ISSN: 1022-1344
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of electrostatic forces among the ionized units on the structure of a polyion is studied using a simplified mean-field model that represents the polymer as a swollen Gaussian coil. Screened Coulombic interactions are approximated by the pairwise additive Yukawa potential. The swelling parameter is estimated in a variational procedure analogous to Flory's theory for neutral polymers. The analytic solution to the variational problem is given. The method is shown to provide a fair description of the polyion configuration at lower ionization or in the presence of moderate concentrations of simple salt in the solution.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mats.1994.040030107
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  • 4
    Electronic Resource
    Electronic Resource
    Liquid-crystalline copolyesters based on poly(p-oxybenzoate) and poly(p,p-biphenylene terephthalate) (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2249-2259 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two copolymers composed of p-hydroxybenzoate (PHB) and biphenylene terephthalate (BPT) with PHB/BPT ratios of 1/2 and 2/1 were characterized with respect to their tendency to exhibit liquid-crystalline behavior in the melt phase. The BPT -rich copolyester, PHB/BPT = 1/2, displayed a birefringent melt phase of very high viscosity and no tendency to crystallize on cooling. The resulting fused material exhibited what apeared to be a second-order transition at 170°C. The PHB-rich composition, PHB/BPT = 2/1, also exhibited a highly birefringent melt phase of high viscosity which was quite shear sensitive. This polymer melt had little tendency to crystallize on cooling; however, on reheating no apparent second-order transition could be detected. The observed phase changes were characterized by differential scanning calorimetry, hot-stage microscopy, and wide-angle x-ray diffraction techniques. Additional data, pertaining to the compositional nature and apparent sequence distribution, were obtained by 13C-NMR spectroscopy of the solid materials through magic-angle spinning, dipolar decoupling, and cross-polarization techniques.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210810
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  • 5
    Electronic Resource
    Electronic Resource
    Chain scission efficiency of some polymers in γ-radiation (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 701-711 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The G values of poly(methyl methacrylates) (PMMA), polycarbonates, and a polylactone for γ-radiation were determined by using a computer-assisted GPC as the primary tool for the measurement of the number-average molecular weights M̄n. The accuracy and precision of the automated GPC were found to have a normalized standard deviation (σ/M̄n) of less than 7%. The G value of PMMA was determined to be essentially independent of molecular weight. For low molecular weight polymers, some nonlinearity in the I/M̄n versus dosage plot was observed at low dosage, i.e., about 1 Mrad.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170140319
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  • 6
    Electronic Resource
    Electronic Resource
    The mechanical and physical properties of Compacted Graphite Iron (1998)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 29 (1998), S. 397-411 
    Details
    ISSN: 0933-5137
    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: Mechanische und Physikalische Eigenschaften von Vermiculargraphit - Gußeisen GGV
    Notes: The mechanical and physical properties of compacted graphite iron (CGI) have been studied. While it is known that CGI provides at least 70% higher tensile strength, 35% higher elastic modulus and 80% higher fatigue limits than conventional grey cast iron, the objective of this paper was to determine how the properties change with varying nodularity (graphite shape) and pearlite content. Tensile properties, hardness, damping capacity and thermal conductivity were determined over the range 0-90% nodularity and 25-100% pearlite. Compressive properties, wear resistance and fatigue behaviour of CGI are also reported upon. Of greatest importance is the influence of patches of flake graphite in predominantly CGI microstructures. As soon as flake patches appear, which can occur with a loss of as little as 0.001% active magnesium, the mechanical properties of CGI abruptly decrease by 25-40%. Proper foundry control technology and quality procedures are therefore required to ensure the reliable production of this improved material.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19980290805
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical synthesis of human protein S thrombin-sensitive module and first epidermal growth factor module (1998)
    New York : Wiley-Blackwell
    Biopolymers 46 (1998), S. 53-63 
    Details
    ISSN: 0006-3525
    Keywords: human plasma protein S ; activated protein C ; blood coagulation ; coagulation factors Va and VIIIa ; thrombin-sensitive region ; first epidermal growth factor module ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Human plasma protein S is a nonenzymatic cofactor for activated protein C (APC) in the inactivation of coagulation factors Va and VIIIa, and helps to provide an essential negative feedback on blood coagulation. Previous indirect evidence suggested that the thrombin-sensitive region (TSR:residues 47-75, 1 disulfide) and the first epidermal growth factorlike region (EGF1: residues 76-116, 3 disulfides) of protein S may be functionally important for expression of its APC cofactor activity. To study the functional importance of these modules directly, access to the isolated TSR and EGF1 modules would be preferred. Recombinant expression of protein S intact TSR and correctly folded EGF1 has not been possible. Here we describe the synthesis of both TSR and EGF1 modules by stepwise solid phase peptide synthesis using the in situ neutralization/2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate activation procedure for tert-butoxycarbonyl chemistry. For the TSR, correct intramodular disulfide bonding was confirmed. To overcome folding difficulties with the EGF1, a two-step oxidation procedure was used in which the cysteines involved in the middle, crossing, disulfide bond (Cys85-Cys102) remained protected with acetamidomethyl (Acm) groups after hydrogen fluoride treatment of the peptide resin. Selective formation of the first two disulfide bonds (Cys80-Cys93 and Cys104-Cys113) was followed by release of the Acm groups and subsequent formation of the third disulfide bond (Cys85-Cys102). CD studies revealed 54% of β-sheet/turn in the EGF1 that is characteristic for EGF modules. Deuterium exchange studies suggested a very tightly packed core in EGF1 that is not accessible to the bulk solvent, likely a result from the compact structure caused by its three disulfide bonds. The 30% β-sheet structure observed in the TSR involved amide protons that could be readily exchanged by deuterons, likely reflecting a more flexible structure of the TSR loop in contrast to the rigid structure of EGF1. The establishment of synthetic access to the TSR and EGF1 of protein S provides a versatile tool to study interactions of these modules with the blood coagulation components of the anticoagulant plasma protein C pathway. © 1998 John Wiley & Sons, Inc. Biopoly 46: 53-63, 1998
    Additional Material: 6 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of acid-denatured DNA by low-angle light scattering (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1017-1028 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Low-angle light scattering results reported previously demonstrated that measurements on high molecular weight native DNA must be made at angles below 30° in order to obtain correct molecular weights. Earlier light-scattering data obtained on denaturated DNA at angles above 30° showed no change in molecular weight upon denaturation, even though other techniques clearly showed that strand separation occurred. This paper reports low-angle measurements on solutions of calf thymus and T7 DNA denatured under acidic conditions. The results demonstrate that a halving of molecular weight consistent with strand separation is detected by light scattering only when low-angle data are used to obtain correct molecular weights for native material. As expected from theoretical considerations, the scattering from denatured DNA is a linear function of sin2(θ/2), where θ is the angle of observation. This result shows that anticipated experimental artifacts have no significant effect on the low-angle measurements and demonstrates that the curvature in the scattering envelope observed for native DNA below 30° is an inherent property of the native molecule.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090905
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  • 9
    Electronic Resource
    Electronic Resource
    Light scattering and hydrodynamic properties of linear and circular bacteriophage lambda DNA (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 2499-2508 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Low-angle light scattering, sedimentation velocity, and intrinsic viscosity measurements have been made on circular and linear forms of lambda (λ) bacteriophage DNA. Available equations, used to relate hydrodynamic parameters of both forms to the molecular weight, give relatively consistent values of particle weights which essentially agree with the light-scattering results. An average molecular weight of (34 ± 3) × 106 for λ DNA was obtained in good agreement with literature values of (31-33) × 106. The linear λ DNA has a larger root-mean-square radius than the circular molecule, when determined by light scattering, but the difference does not appear to be us large as expected from hydrodynamic data. The two forms also show significantly different angular distrbutions of scattered light intensities which agree only qualitatively with those derived from existing theory. The light-scattering results suggest that further experiments and modifications of available theories should be undertaken.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360101211
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  • 10
    Electronic Resource
    Electronic Resource
    The analysis of polyurethane foams. I. Identification of componentsPresented at the 2nd S.P.I. International Cellular Plastics Conference, New York, November 1968. (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 35-43 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A scheme of qualitative analysis is presented for the identification of the constituents of polyurethane foam products, or indeed polyurethane-type materials in general. Elastomeric and cellular polyurethanes are analyzed by hydrolysis to simpler compounds which are then separated and identified. The methods of identification employed include infrared and nuclear magnetic resonance spectroscopy, gas chromatography, and thin-layer chromatography.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1970.070140104
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