a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071 Russia
b Enikolopov Institute of Synthetic Polymeric Materials of Russian Academy of Sciences, Moscow, 117393 Russia
Correspondence to: *e-mail: sofs@list.ru
Received 27 April, 2021
DOI: 10.1134/S2070205121050154