2024 (2) 1

https://doi.org/10.15407/polymerj.46.02.087

Protic polymeric ionic liquid of a block oligomeric structure with ionic bonds in the main chain

Mariana Gumenna1* (ORCID: 0000-0001-8363-6466), Oleksandr StriutskyI1 (ORCID: 0000-0002-1457-2312), Dmytro Kozachuk1 (ORCID: 0000-0003-3825-093X), Andrii Pylypenko1,2 (ORCID: 0000-0003-0538-1386), Viktor Kravchenko3 (ORCID: 0000-0002-8732-7502), Leonid Kovalenko4 (ORCID: 0000-0003-1854-9694), Valery Shevchenko1** (ORCID: 0000-0003-2100-4468)
1Institute of Macromolecular Chemistry of the NAS of Ukraine, 48 Kharkivske Highway, Kyiv 02155, Ukraine,
2Dоnetsk Institute for Physics and Engineering named after O.O. Galkin of the NAS of Ukraine, 46 Nauki Ave., Kyiv 03028, Ukraine,
3L.M. Litvinenko Institute of Physical-organic Chemistry and Coal Chemistry of the NAS of Ukraine, 50 Kharkivske Highway, Kyiv 02155, Ukraine,
4V.I. Vernadsky Institute of General and Inorganic Chemistry of the NAS of Ukraine, 32/34 Academician Palladin Ave., Kyiv 03142, Ukraine
*e-mail: mary-g@ukr.net
**e-mail: valpshevchenko@gmail.com

Polym. J., 2024, 46, no. 2: 87-95.

Section: Structure and properties.

Language: English.

Abstract:

A method for the synthesis of protic polymeric ionic liquid (PIL) of a block oligomeric structure with ionic bonds in the main chain, which turns into a liquid state at temperatures below 50 °C, was developed. Ionic bonding was used to form a polymer chain. It was formed as a result of neutralization reaction between oligomers of telechelic structure with terminal acidic and basic groups. A new linear oligomer containing basic tertiary nitrogen atoms at the ends of the oligoether chain (PEO-2NEt2) was obtained by reaction of α,ω-diglycidyl ether of polyethylene glycol MW 1000 with N,N-diethylamine. A linear oligomer with terminal sulfonic acid groups (PEO-2SO3H), which is a product of the interaction of polyethylene glycol (MW 1000) with the cyclic anhydride of 2-sulfobenzoic acid, was used as an acidic linear oligomer. The synthesis of PIL [PEO-2H-2NEt2]2+ [PEO-2SO3]2- was carried out by neutralization of basic oligomer PEO-2NEt2 with the acidic oligomer PEO-2SO3H in their molar ratio of 1:1. The structure of the obtained compound was characterized by the methods of FTIR and 1H NMR spectroscopy. According to the DSC data, the synthesized PIL contains an amorphous phase with a glass transition temperature of -49.7 °С and a crystalline phase with a melting temperature of 34.5 °С. The decomposition onset temperature corresponding to 5% weight loss is 271 °C according to the TGA. The ionic conductivity of PIL studied by dielectric relaxation spectroscopy under anhydrous conditions in the range from 40 °C to 100 °C increases with increase in temperature and reaches 2.7·10-4 S/cm. The resulting compound is promising as a proton-conducting medium for various electrochemical devices.

Key words: polymeric ionic liquids, acid-base interaction, proton exchange media, proton conductivity.

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