TERPOLYMERIZATION OF STYRENE, NORBORNENE, AND CARBON-MONOXIDE WITH A PALLADIUM CATALYST

In this work, the authors conducted the terpolymerization of carbon mo noxide (CO), styrene (St), and norbornene (NBE) with Pd(CH3COO)(2) in CH3OH under various molar ratios of norbornene to styrene at 90 degree s C. Infrared spectra, H-1 NMR and C-13 NMR analyses confirmed that th e NBE/St/CO terpolymers contain ketone, styrene unit, and ring structu re of norbornene. Physical and thermal properties of the NBE/St/CO ter polymers were also investigated by a differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), solubility and X-ray diffrac tion analyses. The results indicated that glass transition temperature (T-g) of the terpolymers increased when norbornene was introduced. Te rpolymer increased molar ratio of norbornene to styrene was found to n ot only be more thermally stable, but also to increase solubility. As the NBE/St molar ratio became larger than 0.375 in terpolymer, the ter polymers were soluble in chloroform, tetrahydrofuran (THF), methylene chloride, ethylacetate, benzene, dimethylacetamide (DMAc), and pyridin e. X-ray diffraction results indicated that the terpolymer increased m olar ratio or NBE/St in the terpolymer decreased the degree of crystal linity and the angle of maximum intensity owing to the bulky norbornen e group. Hydrogenation of NBE/St/CO terpolymer with a reducing agent y ielded a hydroxyl-containing polymer.