Biographical Memoirs, Volume 86 by National Academy of Sciences

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By National Academy of Sciences

Biographical Memoirs is sequence of essays containing the lifestyles histories and chosen bibliographies of deceased contributors of the nationwide Academy of Sciences. The sequence offers a list of the existence and paintings of a few of the main amazing leaders within the sciences, as witnessed and interpreted by means of their colleagues and friends. They shape a biographical heritage of technology in America--an very important a part of our nation's contribution to the highbrow background of the area.

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From that point in time onward the 13C-NMR spectra of vinyl polymers could be effectively assigned to their stereosequences by evaluating their γ-gauche shieldings from knowledge of their conformational characteristics. In 1976 Schaefer and Stejskal22 first proposed and obtained high-resolution 13C-NMR spectra for polymer solids by combination of several techniques. This made possible the study of the conformations, organizations, and mobility of polymer chains in solid samples, which is their most practical use.

6. F. A. Bovey and G. V. D. Tiers. Polymer NSR spectroscopy. II. The high resolution spectra of methyl methacrylate polymers prepared with free radical and anionic initiators. J. Polym. Sci. 44(143)(1960):173. 7. C. E. , and F. A. Bovey. Calculation of nuclear magnetic resonance spectra of aromatic hydrocarbons. J. Chem. Phys. 29(1958):1012. 8. J. S. Waugh and R. W. Fessenden. Nuclear resonance spectra of hydrocarbons: The free electron model. J. Am. Chem. Soc. 79(1957):846; 80(1958):6697. 9. C.

His high-resolution solid-state NMR studies of polymers were not limited to 13C-NMR but also included observation of the 19F, 29Si, and 31P nuclei, as well. 1,4-trans-Polybutadiene (TPBD) was known to exist in two crystalline structures, Forms I and II, stable below and above ~65°C, respectively. Observations of variabletemperature, high- and low-resolution solid-state 13C-NMR spectra of TPBD and surface-epoxidized TPBD crystals, which immobilizes their fold surface, permitted Bovey and colleagues24 to conclude that TPBD chains are conformationally ordered and rigid in Form I crystals but disordered and mobile in Form II crystals.

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