Abstract
A novel high polymerization of ethylene by Al-TiCl4 catalyst is studied. The polymer yield increases with higher TiCl4 concentration and with larger amount of Al metal used. With an Al/TiCl4 mole ratio larger than 10, the conversion slightly decreases. The highest conversion is gained at 180°C., and higher reaction temperatures decrease remarkably the yield of solid polymer. The molecular wight of polymers increases with the Al/TiCl4 ratio, but it remains constant at Al/TiCl4 ratios larger than 3. It is highest at 180°C. With respect to the Al/TiCl4 mole ratio, the melting point has a relation similar to that of the molecular weight. It is also maximum at 180°C. The rate equation is determined by some kinetic studies, obtaining the formula -dP/dt = 4.37 [TiCl4] exp{-4800/RT}P for a certain range of reaction conditions. A possible cationic mechanism for this polymerization is suggested.
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