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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of molecular motion in collagen using the spin-probe technique (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 907-919 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The spin-probe technique was employed to study molecular motion in collagen and modified collagen samples in the -160° to +200°C region. The effect of water content in the 0-30-wt. % range, relative to vacuum dried samples, on the electron spin resonance spectrum of the probe was also investigated. The spectra at the lowest temperatures consisted of a broad asymmetric triplet. Narrowing of this triplet above -40° to -70°C and the appearance of additional lines in the spectrum, interpreted as due to a narrow triplet, at a temperature dependent on the water content were observed. For samples with low water contents [(0-0.4)%] the broad triplet was that expected for a glassy system up to 150-190°C; for these samples the narrow triplet appears at a temperature above 50°C, its intensity increasing with increasing temperature up to 70-100°C, then decreasing with a further temperature increase. For samples with water contents near 30%, the narrow triplet first completely appears at about 0°C, and reaches relative intensities of 35% at 30°C. The motion taking place in collagen and related samples is discussed in terms of these results.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160413
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radical formation and deformation in poly-p-(2-hydroxyethoxy) benzoic acid fibers (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 89-94 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Radical generation during tensile deformation of poly-p-(2-hydroxyethoxy) benzoic acid (PEOB) fibers was studied by electron spin resonance techniques under various stretching conditions. Primary phenoxy radicals were detected at room temperature, indicating main-chain rupture during mechanical loading. The kinetics of phenoxy radical formation were observed at constant strain, constant load, constant strain-rate, and in constant load rate experiments. The effect of strain rate on the radical formation was found to be larger in this sample than was observed in Nylon 6. These results coupled with other experimental observations have yielded information on a basic structural model and improved insight into the basic molecular mechanism responsible for deformation and fracture.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760190206
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    Paper (German National Licenses)
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