BLOCK COPOLYMERS WITH URETHANE HYDROXY HARD SEGMENTS BASED ON OLIGOETHERTETRAURETHANEDIEPOXIDE AND A BINARY HARDENER

Abstract

The paper describes a method for controlling the physical and mechanical properties of elastomers with urethane hydroxyl rigid blocks. For this, an epoxyurethane oligomer was obtained on the basis of oligotetramethylene oxide diol, isophorone diisocyanate, and glycidol. Oligoetherdiamine was proposed as a hardener, that was synthesized for the first time from oligotetramethylene oxide diol with molecular weight of 1400 through the stage of bromination followed by amination. Molecular structure was determined by NMR and FTIR spectroscopy. On the basis of the synthesized amine and its mixtures with isophoronediamine, 5 new elastomers with different degrees of microphase separation and crystallinity were fabricated. Using differential scanning calorimetry, it was proved that the glass transition temperature of the obtained elastomers, regardless of the hardener type, is less than minus 70°C, which makes it possible to use these elastomers in the conditions of the Arctic and the Far North. It was shown that the degree of crystallinity and microphase separation of soft and hard segments in elastomers with urethane hydroxyl hard blocks can be used to control physical and mechanical characteristics of epoxyurethane elastomers.