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Determination of the physical network of entanglements and the molecular mobility in linear flexible polymers by the NMR method

  • Chemical Physics of Polymer Materials
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Abstract

In the present paper, a theory of free induction decay in linear flexible chain polymers is developed. Theoretical and experimental dependences of the spin-spin relaxation time T 2 on the average molecular weight M w and temperature are compared. It is shown that, with increasing M w , the topological structure of linear polymers changes, and at M w > 105, a physical network entanglements (quasi-network) is formed. A correlation function of molecular motions is obtained, which indicates whether the quasi-network is formed in polymer melts.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, Russia

    T. P. Kulagina & A. N. Kuzina

  2. People’s Friendship University of Russia, Moscow, Russia

    V. A. Varakina

Authors
  1. T. P. Kulagina
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  2. V. A. Varakina
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  3. A. N. Kuzina
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Correspondence to T. P. Kulagina.

Additional information

Original Russian Text © T.P. Kulagina, V.A. Varakina, A.N. Kuzina, 2014, published in Khimicheskaya Fizika, 2014, Vol. 33, No. 5, pp. 76–81.

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Kulagina, T.P., Varakina, V.A. & Kuzina, A.N. Determination of the physical network of entanglements and the molecular mobility in linear flexible polymers by the NMR method. Russ. J. Phys. Chem. B 8, 391–395 (2014). https://doi.org/10.1134/S1990793114030075

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  • DOI: https://doi.org/10.1134/S1990793114030075

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