*Article* **Synthesis and Study of Physical and Mechanical Properties of Urethane-Containing Elastomers Based on Epoxyurethane Oligomers with Controlled Crystallinity**

**Alexey Slobodinyuk \* , Vladimir Strelnikov, Nadezhda Elchisheva, Dmitriy Kiselkov and Daria Slobodinyuk**

Institute of Technical Chemistry Ural Branch of the Russian Academy of Sciences, Ac. Korolev 3, 614130 Perm, Russia; svn@itcras.ru (V.S.); env-1981@mail.ru (N.E.); dkiselkov@yandex.ru (D.K.); selivanovadg@gmail.com (D.S.)

**\*** Correspondence: slobodinyuk.aleksey.ktn@mail.ru; Tel.: +7-(342)-237-8256

**Abstract:** The influence of the molecular weight of oligoamine, oligoether, and the type of diisocyanate on the physical and mechanical properties of elastomers with urethane hydroxyl hard segments was studied. For this purpose, oligoetherdiamines with molecular weights ~1008 and ~1400 g mol−<sup>1</sup> were synthesized by a three-stage method. Epoxyurethane oligomers were synthesized according to a two-step route with an oligodiisocyanate as an intermediate product. A series of 12 elastomers with controlled crystallinity were synthesized from these elastomers and amines. The deformation and strength properties of the elastomers were studied.

**Keywords:** curing agent; epoxyurethane oligomer; oligotetramethylene oxide diol; synthesis; bromination; Gabriel reaction
