Polycarbonate urethane was synthesized from polycarbonate diol(PCN)

4

4′-methylene diphenyl diisocyanate and 1

4-bytanediol by the melting one-shot method.The thermal behavior and microphase separation of the polymer were characterized with DSC and TGA.The distance between microphases was estimated from the data of SAXS.Tensile test was used to analyze the effects of different Mn of PCN and content of soft segment on mechanical properties.The results showed that the polymer had partial microphase separation structure

and this structure was less obvious with the increase of the content of soft segment.There were two types of micro-domains in the continuous phase of polycarbonate，the micro-domain formed with urethane and the micro-domain of polycarbonate crystallization itself.There were two obvious stages in its thermal decomposition on which the effect of the content of soft segment was not obvious.With the increase of the content of PCN

the Young’s Modulus decreased and the elongation at break increased.The as-synthesized polycarbonate urethanes(PCNU)showed a maximum tensile strength of 80 MPa.At the same time

elongation at break was more than 400%.