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Microstructure and Thermal and Rheological Properties of Low-Molecular-Mass Ethylene–Vinyl Acetate Copolymer

  • Macromolecular Compounds and Polymeric Materials
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Abstract

The microstructure of low-molecular-mass ethylene–vinyl acetate copolymers was studied by 1Н and 13С NMR spectroscopy. The vinyl acetate mole fraction, chain branching, and mean lengths of ethylene and vinyl acetate blocks were determined. The thermal properties of ethylene–vinyl acetate copolymers were studied by differential scanning calorimetry and thermogravimetric analysis, and the crystalline characteristics, by X-ray diffraction analysis. The degree of crystallinity of the copolymer decreases with an increase in the fraction of the polar comonomer. Rheological studies show that ethylene–vinyl acetate copolymers at room temperature tend to microphase segregation and form a microphase structural network.

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Funding

Synthesis of the ethylene–vinyl acetate copolymer, determination of its microstructure, and studies of the thermal, crystalline, and rheological properties of the laboratory and commercially available samples were performed within the framework of the government assignment for the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (no. FFZN-2022-0005) using the equipment of the Center for Shared Use Analytical Center for Problems of Deep Oil Refining and Petroleum Chemistry, Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences.

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Authors and Affiliations

  1. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia

    A. A. Morontsev, G. O. Karpov, S. O. Ilyin, K. I. Dement’ev & M. V. Bermeshev

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  1. A. A. Morontsev
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  2. G. O. Karpov
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  3. S. O. Ilyin
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  4. K. I. Dement’ev
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  5. M. V. Bermeshev
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Contributions

A.A. Morontsev: synthesis of the ethylene–vinyl acetate copolymer, confirmation of its structure by IR spectroscopy; G.O. Karpov: description of the results of thermal studies; S.O. Ilyin: rheological study of the ethylene–vinyl acetate copolymer samples and description of the results obtained; K.I. Dement’ev: X-ray diffraction analysis of the ethylene–vinyl acetate copolymers and description of the results obtained; M.V. Bermeshev: analysis of the microstructure of ethylene–vinyl acetate copolymers by 1Н and 13С NMR spectroscopy.

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Correspondence to A. A. Morontsev.

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The authors declare that they have no conflict of interest.

Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 1, pp. 84–94, August, 2023 https://doi.org/10.31857/S0044461823010103

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Morontsev, A.A., Karpov, G.O., Ilyin, S.O. et al. Microstructure and Thermal and Rheological Properties of Low-Molecular-Mass Ethylene–Vinyl Acetate Copolymer. Russ J Appl Chem 96, 73–82 (2023). https://doi.org/10.1134/S107042722301010X

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  • DOI: https://doi.org/10.1134/S107042722301010X

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