Polyaryl polyisocyanate

PECH 2000 hydroxyl content 16.72 x 10" mol g" Cl content 30%. Polyaryl polyisocyanate (PAPI) mass fraction of NCO 31% density 1.24gcm PMMA-MMA solution (containing 1.0% mole fraction of ethylene glycol dimethacrylate (EGDMA) and 0.5% mole fraction of benzoyl peroxide (BPO)]. PAPI and PMMA were mixed into PECH. After vacuum treatment, it was poured into a mold and cured for 2 days at 50 °C, 1 day at 90 °C and 1 day at 120 °C. 

X 10mol g" Cl content 32.5% viscosity (25 °C) 10.5 Pa s. Polyaryl polyisocyanate (PAPI) NCO content 31% density 1.24 gcm". PECH and PAPI were mixed and poured into a mold after vacuum treatment and then cured at 100-120 °C. 

Polyurethane/lmide Modified Foam n A polyaryl polyisocyanate (PAPI) is reacted with a 3,3 ,4, -benzophe-none tetracarboxylic dianhydride (BTDA) to form an isocyanate prepolymer. This prepolymer can be compounded with a polyol, a blowing agent, a catalyst, and a ceU stabilizer to form the modified foam. Such a foam containing 5% BTDA in the prepolymer has better thermal properties than conventional polyurethane foams. 

---