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Stimulated echo method for investigation of structural and dynamic characteristics of branched polymers

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Abstract

The theory of stimulated echo (SE) without magnetic field gradient is proposed. The theory made it possible for the first time to establish a relationship between the stimulated echo signal and correlation function of molecular mobility. Signals of free induction decay (FID) and SE in polymer networks and branched polymers were modeled. The type of the correlation function at different average chain lengths N 0 between knots and different distribution functions of the knots was determined. A strong influence of the molecular weight distribution (MWD) on the type of the correlation function in polymer melts was shown. Two methods were proposed for the numerical determination of the correlation function from the observed FID and SE signals. These methods gave an information about the molecular mobility and topological structure in the samples of branched polymethyl methacrylates of different structures and various molecular weights.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432, Chernogolovka, Moscow Region, Russian Federation

    T. P. Kulagina, G. E. Karnaukh & S. V. Kurmaz

  2. Institute of Solid State Physics, Russian Academy of Sciences, 2 prosp. Akad. Osip´yana, 142432, Chernogolovka, Moscow Region, Russian Federation

    O. M. Vyaselev

Authors
  1. T. P. Kulagina
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  2. G. E. Karnaukh
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  3. S. V. Kurmaz
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  4. O. M. Vyaselev
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Correspondence to T. P. Kulagina.

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Dedicated to the 60th anniversary of the Institute of Problems of Chemical Physics, Russian Academy of Sciences.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2494—2499, October, 2016.

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Kulagina, T.P., Karnaukh, G.E., Kurmaz, S.V. et al. Stimulated echo method for investigation of structural and dynamic characteristics of branched polymers. Russ Chem Bull 65, 2494–2499 (2016). https://doi.org/10.1007/s11172-016-1612-8

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  • DOI: https://doi.org/10.1007/s11172-016-1612-8

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