Abstract
The three-dimensional densely crosslinked networks obtained from epoxy oligomers and amine crosslinking agents of different nature and molecular weight are studied. For hypothetical polymers whose units correspond to chain fragments between crosslink junctions, the values of the Kuhn segment are calculated. On the basis of these data, its average rigidity is determined taking into account the stoichiometric ratio of the fragments of the network. It is shown that allowance for the average rigidity of the network makes it possible to unambiguously relate the glass transition temperature to the average molecular weight of the chain fragment between crosslink junctions.
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ACKNOWLEDGMENTS
A part of the experimental work was performed using the equipment of the Center for Collective Use Physical Methods of Research of the Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences.
We are grateful to L.N. Andreeva (Institute of Macromolecular Compounds, Russian Academy of Sciences) for online consultations in the ResearchGate system.
Funding
This work was supported by the Russian Science Foundation, project 18-79-00114.
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Zhavoronok, E.S., Senchikhin, I.N. Estimation of Crosslink Density of a Densely Crosslinked Polymer Taking into Account the Rigidity of a Chain Fragment Between Crosslink Junctions. Polym. Sci. Ser. B 61, 451–457 (2019). https://doi.org/10.1134/S1560090419040158
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DOI: https://doi.org/10.1134/S1560090419040158