Polyurethane (PU) elastomers based on α,ω-oligobutadiene nitrile diols

• Published in: Polymer science USSR 1970, Vol.12 (9), p.2339-2344
• Main Authors: Sergeyeva, L.M, Belov, I.B, Lipatov, Yu.S, Todosiichuk, T.T, Kogan, Z.Ye, Kalaus, A.Ye
• Format: Article
• Language: English
• ISSN: 0032-3950; 1878-268X
• DOI: 10.1016/0032-3950(70)90469-7

The properties of polyurethanes (PU) based on oligoisoprene diols were investigated in earlier work [1]. This had shown that the replacement of the oligoether by the oligodiene block in the PU chain changed the structure of the network and the physico-chemical properties of the material. The contribution made by physical bonds to the overall network density in oligodiene-based PU was found to be smaller than that in oligoether-based ones. The intermolecular reaction energy characterized by the intensity of the cohesion places the PU in a position between the normal PU and natural rubbers. The examination of PU based on dienes of a different nature, i.e. containing functional groups capable of forming physical bonds, was therefore thought to be worthwhile. This communication describes the study of urethane elastomers based on oligobutadiene nitrile diols containing nitrile groups, and produced by free-radical polymerization [2]. We believe the introduction of the polar nitrile groups into the oligodiene molecule to change some of the elastomer properties, which had been produced previously, because of the possible reinforcement of molecular interaction. This is in some way analogous to the change of urethane elastomer properties due to the exchange of the ether for an ester block with a C=O group, which is able to form additional physical bonds with other polar groups; this will affect the ultimate properties of the polymers based on them.