Abstract: The polypropylene glycol polyurethane modified by polyhexylene carbonate diol (HPPU)was synthesized from polyhexylene carbonate diol(PHCD),polypropylene glycol (PPG),4,4'-diphenylmethane diisocyanate(MDI)and 1,4-butylene diol(BDO)by one-step technique.Its IR speetra,mechanical properties,resistance to hydrolysis and rheological be-havior were studied.The results show that both the tensile strength and tensile stress at 100% and 300% strain increase with increasing content of PHCD in soft segment.When PHCD content in soft segment is 51.29%,the tensile strength increases to 150% of that of the non-modified PU.After dipping in water at 40℃ for 42 days,the retention of tensile strength is no less than 84%.

Key words: polyhexylene carbonate diol, polypropylene glycol, polyurethane, modification