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  • 1
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    Probing Polymer-Segment Motions By ESR (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Molecular origins of mechanical properties and aging processes studied. Rotational motions of segments of poly(methyl methacrylate) molecules studied theoretically and experimentally. Activation energies of these motions as determined from temperature dependencies of ESR spectra agree closely with predictions of theory.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-16970 , NASA Tech Briefs (ISSN 0145-319X); 12; 3; P. 39
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    NASA TECHNICAL REPORTS
  • 2
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    ESR Measurement Of Crystallinity In Semicrystalline Polymers (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Photogenerated free radicals decay at different rates in crystalline and amorphous phases. Degree of crystallinity in polymer having both crystalline and amorphous phases measured indirectly by technique based in part on electron-spin-resonance (ESR) spectroscopy. Accuracy of crystallinity determined by new technique equals or exceeds similar determinations by differential scanning calorimetry, wide-angle x-ray scattering, or measurement of density.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17369 , NASA Tech Briefs (ISSN 0145-319X); 13; 9; P. 50
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    NASA TECHNICAL REPORTS
  • 3
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    ESR Analysis of Polymer Photo-Oxidation (1987)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Electron-spin resonance identifies polymer-degradation reactions and their kinetics. New technique enables derivation of kinetic model of specific chemical reactions involved in degradation of particular polymer. Detailed information provided by new method enables prediction of aging characteristics long before manifestation of macroscopic mechanical properties.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-16847 , NASA Tech Briefs (ISSN 0145-319X); 11; 6; P. 34
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    NASA TECHNICAL REPORTS
  • 4
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    Measurement Of Molecular Mobilities Of Polymers (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: New molecular-probe technique used to measure molecular mobility of polymer. Method based on use of time-resolved electron-spin resonance (ESR) spectroscopy to monitor decay of transient nutation amplitudes from photoexcited triplet states of probe molecules with which polymer is doped. The higher molecular mobility of polymer matrix, the faster nutation amplitudes of the probe molecules decay.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17216 , NASA Tech Briefs (ISSN 0145-319X); 13; 4; P. 74
    Format: text
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    NASA TECHNICAL REPORTS
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