By alternating the supply of propylene and ethylene monomers, alternating polypropylene and polyethylene films were produced
on one model Ziegler–Natta catalyst. This way, we could show that the active polymerization sites remain under the growing
polymer films and thus the monomer molecules must transport through the growing polymer to the active sites.
Ziegler–Natta - model catalyst - active site - monomer diffusion - X-ray photoelectron spectroscopy - laser reflection interferometry
This revised version was published online in July 2006 with corrections to the Cover Date.