majid barikani - Department of Polymer Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran Young Research Club, Science and Research branch, Islamic Azad University, Tehran, Iran
naghmeh fazeli - Department of Polymer Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
mehdi barikani - Iran Polymer and Petrochemical Institute,P.O.Box۱۴۹۶۵/۱۱۵,Tehran ,Iran

A number of polyurethane prepolymers based on polycaprolactone diol (CAPA),and 4,4'-diphenyl methane diisocyanate(MDI)were synthesized and extended with different dianilines such as: 4,4`-Methylenebis(2,6-diisopropylaniline) (M-DIPA ), 4,4'-Methylenebis(2-isopropyl-6-methylaniline) (M-MIPA),4,4`-Methylenebis(2,6-diethylaniline) (M-DEA),and 4,4`-Methylenebis(3-chloro-2,6-diethylaniline) ( M- CDEA).A method of using high melting point chain extenders in the synthesis of castable polyurethane Elastomer was applied in which the high melting point chain extenders was first dissolved in DMF before mixing with prepolymer. Using this method it was found possible to carry out a bulk polymerization in the normal PU reaction temperature range of 80-100C.IR spectroscopy was used to check the end of polymerization reaction and polymer characterization .Thermal properties were measured by means of DMTA, TGA and DSC and The effect of dianiline structure on the thermal properties of the cast films were studied and compared. It was found that the Thermal properties and thermal stabilitiesare affected by variation of dianiline molecular structure.

diamine,thermal stability,dianiline,polyurethane,TGA