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Mesomorphism of Disubstituted Aliphatic Polyphosphazenes and Anisotropic-Optical Properties of Their Molecules

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Abstract

Some correlations between phase behavior parameters and molecular solution properties of disubstituted aliphatic/partially fluorinated aliphatic polyphosphazenes have been found to be due to their dependence on the side substituent length. Experimental study of the electro-optical Kerr effect and the dynamo-optical Maxwell effect in dilute solutions have showed that both types of polyphosphazenes exhibit an alteration of the effects’ sign when their aliphatic side chains reach a certain “critical” length (~5–6 carbon atoms). This phenomenon is explained by a change of the direction of primary axis of optical (deformational) polarizability in the monomer unit of polyphosphazenes with the “critical” length of side substituents. One of the consequences of the change of primary polarizability axis is an increasing of the angles between the dipoles induced by electric field and the permanent dipoles of the main chain. Additionally it was experimentally established that optical anisotropy of polarizability of monomer unit for the polymers under consideration is close to zero when their side substituents are consist of 5–6 carbon atoms. An absence or extremely small anisotropy of polarizability for macromolecules with the diverging directions of the permanent and induced dipoles has been considered as a general stimulus for additional ordering of disubstituted polyphosphazenes in the melt and for mesophase formation.

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Authors and Affiliations

  1. Saint Petersburg State University, Ulianovskaja St. 3, 198504, Saint Petersburg, Russia

    N. Yevlampieva & E. Ryumtsev

  2. Institute of Organoelement Compounds, RAS, Vavilova St. 28, 119991, Moscow, Russia

    V. Papkov

Authors
  1. N. Yevlampieva
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  2. V. Papkov
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  3. E. Ryumtsev
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Correspondence to N. Yevlampieva.

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Yevlampieva, N., Papkov, V. & Ryumtsev, E. Mesomorphism of Disubstituted Aliphatic Polyphosphazenes and Anisotropic-Optical Properties of Their Molecules. J Inorg Organomet Polym 25, 787–795 (2015). https://doi.org/10.1007/s10904-014-0160-7

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  • DOI: https://doi.org/10.1007/s10904-014-0160-7

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