Application of DSC method for thermal stability and flammability assessment of modified polyurethanes

Differential scanning calorimetry (DSC) was applied to investigate the ther mal behaviour of a series of segmented polyurethanes based on diphenylmetha ne-4,4'-diisocyanate (MDI), polyoxypropylenediol (POPD) and 3-chloro-1,2-pr opanediol (CPD)/1,2-propanediol (PD). It has been found that the heat of thermal transition in the range of 250-3 00 degreesC increases with the amount of CPD, which also causes a decrease of polyurethanes' flammability, characterised by its Limited Oxygen Index ( LOI) value. On the basis of obtained results it can be concluded that DSC m ay be applied for flammability evaluation of segmented polyurethanes.