Synthesis and Thermodynamics Properties of Polysulfide Based Polyurethane

Polysulfide based polyurethane was synthesized from polysulfide(PS) with different molecular weight and thiol contents, diphenylmethane diisocyanate(DPMDI) and polytetramethylene glycol(PTMG). The structure, thermodynamics properties and degradation activation energy of polysulfide based polyurethane were characterized by FT IR, DSC and TGA. Polyurethanes modified by G4 and G21C polysulfides had better thermodynamics stability compared to those unmodified and the degradation activation energy was increased to 171.36 kJ/mol.