POLYMER-SUPPORTED ZIEGLER-NATTA CATALYSTS .1. A PRELIMINARY-STUDY OF CATALYST SYNTHESIS

Polymer-supported Ziegler-Natta catalysts based on various polymer car riers were synthesized by different methods, including (1) loading TiC l4 directly onto the polymer supports; (2) loading TiCl4 onto the poly mer supports modified by magnesium chloride (MgCl2); (3) loading TiCl4 onto the polymer supports modified by Grignard reagent (RMgCl); and ( 4) loading TiCl4 onto the polymer supports modified by magnesium alkyl s (MgR2). The activity and kinetic features of the catalysts for ethyl ene polymerization were examined. Among the combinations tested, the b est was found to be TiCl4/n-Bu2Mg.Et3Al/poly (ethylene-co-acrylic acid ) (92 : 8), which produced a catalyst of very high activity for ethyle ne polymerization. (C) 1994 John Wiley & Sons, Inc.