Synthesis and properties of comb-shaped segmented poly(urethanes) based on 1,2-propanediol derivatives

Comb-shaped segmented poly(urethanes) have been synthesized from ethers via the one-step procedure with the use of glycerol monostearate, D,L-3-octadecyloxy-1,2-propanediol, 3-tert-butoxy-1,2-propanediol, 3-benzyloxy-1,2-propanediol, and 1,2-propanediol as chain extenders. The soft segment of poly(urethanes) was derived from macrodiol (poly(tetramethylene glycol) with M _n = 1000), and 1,6-hexamethylene diisocyanate and 4,4′-cyclohexylmethane diisocyanate were used as diisocyanates. The effect of the structure of side chains located at the hard segments on the formation of hydrogen bonds in comb-shaped poly(urethanes) has been studied by IR spectroscopy. On the basis of DSC measurements, the glass transition temperatures of the soft and hard segments and the temperature and enthalpy of melting of the crystalline phase have been estimated and the microphase separation of segments has been assessed. The mechanical characteristics of the polymers under study have been examined.