Аннотация:A synthetic route to frost-resistant siloxane rubbers isdeveloped on the basis of the anionic block copolymerization of amixture of cyclooctamethyltetrasiloxane,hexaethylcyclotrisiloxane, and 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane in the presence of KOH. Theresulting rubbers were used to produce frost-resistant elastomers.According to the results of DSC studies, the glass-transitiontemperature of the frost-resistant rubber is –129 °C; nocrystallization or melting processes of the samples are detectedon the thermograms. The elastomer obtained based on thesiloxane rubber retains its operational characteristics even at thetemperature as low as –123 °C.This work was supported by the Russian ScienceFoundation, project no. 21-73-30030.The NMR, GPC, GLC and TGA studies were performed atthe Collaborative Research Center "Center for PolymerResearch" of ISPM RAS supported by the Ministry of ScienceINEOS OPEN – Journal of Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences 5M. A. Obrezkova et al., INEOS OPEN, 2023, X (X), XX–XXand Higher Education of the Russian Federation, topic no.FFSM-2021-0004.The DSC and TMA experiments were carried out at theCenter for Molecular Composition Studies of INEOS RAS withfinancial support from the Ministry of Science and HigherEducation of the Russian Federation, agreement no. 075-00697-22-00.