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The electron-probe method in the study of polymers

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Theoretical and Experimental Chemistry Aims and scope

Abstract

Physical principles are given for the method, which employs changes in the absorption and luminescence spectra of trace components in research on the structural and phase transitions in the polymer matrix. The scope of the method is demonstrated for polyethylene as matrix (a typical two-phase system), with anthracene as the probe. The spectrum shifts about 750 cm−1 to longer wavelengths in the crystalline phase relative to the amorphous phase. Such shifts are very sensitive to temperature and to mechanical damage to the polyethylene, so it is possible to follow temperature trends in the densities of the amorphous and crystalline regions; the bulk expansion coefficients can be measured, as can the vitrification temperature. It can be shown that the melt (50‡ above the melting point) contains crystalline regions of fluctuation type.

Tests on cold drawing of polyethylene reveal melting (recrystallization) of the supermolecular structure in the neck region, in accordance with Kargin's views. The method is thus applicable to second-order phase transitions.

Anthracene in the crystalline regions shows a considerable enhancement of the luminescence intensity, evidently from migration of energy from molecules in the amorphous material.

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Authors and Affiliations

  1. Institute of the Chemistry of Macromolecular Compounds, AS UkrSSR, Kiev

    Yu. P. Egorov, E. G. Moisya & I. A. Ar'ev

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  1. Yu. P. Egorov
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  2. E. G. Moisya
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  3. I. A. Ar'ev
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Egorov, Y.P., Moisya, E.G. & Ar'ev, I.A. The electron-probe method in the study of polymers. Theor Exp Chem 3, 471–478 (1971). https://doi.org/10.1007/BF00523711

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