Novel magnetic polyethylene nanocomposites produced by suported nanometre magnetic Ziegler-Natta catalyst

摘要

This paper describes the preparation of novel magnetic polyethylene nanocompositeS using a nanometre magnetic Ziegler—Natta catalyst. It was found that novel magnetic polyethylene nano-composites can be obtained according to the following four steps: (1) preparation of nanometre magnetic particles; (2) reaction between AIR3 and hydroxyls on the surface of nanometre magnetic particles to form anchor points —AIR,; (3) addition of TiCl~, Ti being coordinated to anchor points on the surface of nanometre magnetic particles to form polymerization active centres; (4) ethylene polymerization being carried out in situ on the surface of the nanometre magnetic particles to produce novel magnetic polyethylene nanocomposites. It is found that the activity of ethylene polymerization is essentially unaffected by polymerization temperature and polymerization time.