Some Physical Properties of Brominated Polyisocyanates

Rigid polyurethane was prepared from alcoholized castor oil and toluene diisocyanate. Modification of polyurethane was carried out by treating with bisphenol (4,4'-dihydroxy diphenyl propane) and brominated bisphenol (tetrabromo 4,4'-dihydroxy diphenyl propane) to improve its physical properties. The probable quantities of bisphenols for alcoholized castor oil to form cross-linked network structure of polyurethane are given. These two structures have high level tensile strength, elongation and excellent electrical resistivity. All samples can be used in mechanical and electrical fields. In addition the brominated samples act as flame retardants.