PHASE STATE OF IRON SYSTEM COLLOIDAL CATALYST IN BUTADIENE POLYMERIZATION

By Tyndall effect, the observation of electronic microscope, super-fil tering experiment and determination of the electric conductivity of no n-aqueous system proved that Fe(naph)(2)-Al( i-Bu)(3)- CH2=CHCH2Cl cat alyst was a colloidal disperse system in butadiene-contained hydrogena ted gasoline solvent. Catalytic activity sites were located on the sur face of colloidal particles. So the catalyst was colloidal catalyst. A l(i-Bu)(3) existed in associated state and dissociated into ion couple . The reaction between the ion couple and Fe(naph)(2) was the chief re action to form colloidal core. Di-i-butylaluminum chloride produced by the reaction between the ion couple and CH2=CHCH2Cl formed an active site on the surface of the core. The electric double layer yielded by a proper excess Al(i-Bu)(3) made the colloidal particles comparatively stable. The catalyst particles are amorphous. The ratio of catalyst c omponents affected the shape of colloidal particles, among which the c olloidal particles of the optimal ratio were small in size, even distr ibuted and with high catalytic activity. Since the catalyst was of the coalescence unstable colloidal system, in the period of aging, the co lloidal particles aggregated and grew quickly, so its activity was dec reased obviously.