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  • Physics  (19)
  • Analytical Chemistry and Spectroscopy  (8)
  • Wiley-Blackwell  (27)
  • American Geophysical Union (AGU)
  • Nature Publishing Group (NPG)
  • 1970-1974  (27)
  • 1935-1939
Collection
Keywords
Publisher
  • Wiley-Blackwell  (27)
  • American Geophysical Union (AGU)
  • Nature Publishing Group (NPG)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of temperature on the dynamic young's and shear moduli of unidirectional carbon fiber-epoxy composite beams (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 8 (1970), S. 1575-1584 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The resonance frequencies of unidirectional carbon fiber reinforced/epoxy composite beams were studied over the temperature range 24-225°C. Longitudinal Young's moduli E11 and longitudinal-transverse shear moduli G12 were computed from the experimental data by the use of Timoshenko beam theory. The effects of transverse shear deformation (a function of E11/G12) were found to increase in importance with increasing temperature. Values of G12 were found to be approximately proportional to the shear modulus Gm of matrix material but were about 30% lower than predicted by the theory of Hashin and Rosen. The anisotropy of the carbon filaments and voids in the composite samples were proposed to account for the discrepancy between theory and experiment.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.160080911
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  • 2
    Electronic Resource
    Electronic Resource
    A semi-empirical approach to the viscosities of polyelectrolyte solutions (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 171-189 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The concentration dependence of the reduced viscosity of a number of polyelectrolytes was found to be adequately described by the equation \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm \eta }_{sp} /c = [{\rm \eta }]_\infty [1 + k/\sqrt c ] $\end{document} as long as the concentration is not too low. The parameter [η]∞ represents the intrinsic viscosity of the well-shielded polyion and corresponds to values of [η] determined in salt solutions and may possibly correspond to the theory of Harris and Rice on polyion expansion. Heuristic arguments based in part on the work of Katchalsky et al. lead to a definite expression for the parameter k in terms of molecular properties. This result shows that the above equation is valid only for strong polyelectrolytes with constant activity coefficients of counterion. The calculated values of k agree well with experiment except when specific intramolecular interactions (e.g., internal hydrogen bonding) occur. For highly charged polyions we find, surprisingly, that k depends only on the properties of the polymer backbone and not on electrical properties.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100113
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  • 3
    Electronic Resource
    Electronic Resource
    Thermomechanical behavior of rubberlike materials (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 1681-1689 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A simple form of nonisothermal free energy function A(λ1, λ2, λ3, T) for rubberlike materials results from postulating that the entropy is a separable symmetric function of the extension ratios λi along the principal strain directions and considering the fundamental properties of rubberlike materials, i.e., that rubber elasticity is associated primarily with changes in entropy and the variation of elastic tension with changes in temperature is linear. The explicit representation of A is reduced to the Valanis-Landel strain energy function for isothermal cases.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100904
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  • 4
    Electronic Resource
    Electronic Resource
    A preliminary study of thermoluminescence in polypropylene (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 10 (1972), S. 2101-2105 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.180101022
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  • 5
    Electronic Resource
    Electronic Resource
    Reaction of nitrogen dioxide with linear polyurethane (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 3227-3242 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Linear polyurethane has been exposed to nitrogen dioxide over a temperature range from 15 to 60°C at pressures of 20 and 2 mm Hg, respectively. Normal random-chain scission of urethane links takes place accompanied by a limited amount of random crosslinking. These crosslinks are eventually irreversibly scissioned again. At the same time, carbon dioxide is evolved, and the infrared spectra of the polymer films change during exposure, indicating disappearance of urethane linkages and formation and decay of nitro and nitroso groups along the polymer backbone. The overall reaction is diffusion-controlled at least down to a film thickness of 10 μ. All energies of activation of the various processes are relatively small as expected for a diffusion controlled process. Tentative mechanisms have been proposed agreeing well with experimental results.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170111216
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  • 6
    Electronic Resource
    Electronic Resource
    Tris(dipivaloylmethanato)europium induced shifts of proton resonances in π-deficient nitrogen heterocycles (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 575-582 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tris(dipivaloylmethanato)europium [Eu(DPM)3]induced shifts of the proton resonances of pyridine and its 2-methyl, 3-methyl, 2,3-dimethyl and 2,5-dimethyl derivatives, pyridazine, pyrimidine, pyrazine, quinoline, isoquinoline, 1,6-, 1,7- and 1,8-naphthyridine, cinnoline, phthalazine, quinazoline, quinoxaline, 1,4,5- and 1,4,6-triazanaphthalene, pteridine, acridine, phenanthridine and 1, 10-phenanthroline, have been measured for solutions containing 0·1, 0·3 and 0·5 molar equivalents of Eu(DPM)3. Differences in the behaviour of these heterocycles are discussed in terms of the steric relationship between the heterocycle and the complex. The 3 cos2 φ term, present in the expression for calculating pseudo-contact shifts, is shown to be important. The order of basicity of these heterocycles, as measured by their pKa values, cannot be used to predict the order of Eu(DPM)3 induced chemical shifts.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030512
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  • 7
    Electronic Resource
    Electronic Resource
    A systematic approach to the AA′BB′, AA′BB′MX and derived systems in nuclear magnetic resonance (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 83-99 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The AA′BB′ and AA′BB′MX nuclear magnetic resonance spin systems for I = ½ nuclei have been analysed. Expressions for the transition frequencies and intensities have been obtained which have the maximum accuracy consistent with practicable use. The analyses have been applied respectively to a hypothetical AA′BB′ nuclear spin system and to the two molecules para- fluoro-phenyldichlorophosphine and tris-para-fluorophenylphosphine. Inconsistencies in earlier treatments of the AA′BB′ system have been clarified.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030109
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  • 8
    Electronic Resource
    Electronic Resource
    AB-based NMR systems. Choice of bounds for θ in trigonometric forms of co-factors in mixed wave-functions (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 67-72 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Labelling problems associated with the choice of bounds for the angle θ in the trigonometric forms of the co-factor expressions for levels in AB-based NMR spectra have been investigated. It has been shown that any pair of octants within the 0 → 2π range can be specified as bounds, provided that appropriate linear combinations of wave functions are chosen. The range 0 ≤ θ ≤ π/2 is preferred for simplicity in calculation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040108
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  • 9
    Electronic Resource
    Electronic Resource
    Electroinitiated cationic polymerization of styrene (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 3339-3348 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A constant controlled current was passed through a solution of styrene in methylene chloride containing a tetraalkylammonium salt as supporting electrolyte. Reproducible rates of polymerization were initiated by the electrochemical techniques employed and the kinetics of the reaction were investigated. Sigmoidal curves of conversion versus time were observed. A kinetic relationship of the form In ([M0]/[M]) = ½ Kt2 was derived on the basis of simple assumptions regarding the mechanism and fitted the data accurately. The rate constants obtained were compared to others reported, and the influences of ion association on the values of the rate constants obtained are discussed. The reactions were decreased in rate by a reversal of polarity of the electrodes. However, the stoichiometry of the production of active centers and of their destruction was not ideal, in that each electron did not result in the initiation of a polymer chain.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.150081126
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation and reactions of lithiated poly(2,6-diphenyl-1,4-phenylene ether) (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 3067-3069 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150091027
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