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Unformatted text preview: linearly proportional to the pressure. 3. In the preparation of polyethylene copolymers, such as poly(ethylene-co-1-octene), metallocene homogeneous catalyst is preferred over Ziegler-Natta heterogeneous catalyst. Explain why? 4. Compare the differences in the reaction mechanism and reaction conditions to prepare isotactic and syndiotactic polypropylene during Transition metal coordination (Zieger-Natta) polymerization. 5. Polyethylene and polypropylene are two most important commercial plastics. They are semi-crystalline polymers. Explain why their copolymers – poly(ethylene-co-propylene) – are rubbery material used in every tires....
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This note was uploaded on 10/16/2010 for the course MATSE 441 taught by Professor Chung,tze-chiang during the Fall '10 term at Penn State.
- Fall '10