Hanyang Univ. Spring 2008 Chap 12. Zieglar-Natta Catalyst - Before Z-N Catalyst invention, PP composites were only atactic form - After that, isotactic.

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Hanyang Univ. Spring 2008 Chap 12. Zieglar-Natta Catalyst - Before Z-N Catalyst invention, PP composites were only atactic form - After that, isotactic PP composites of extraordinary MW(>10 6 ) is synthesized LDPE = HPPEHDPEPP This has less hardness, stiffness and strength compared to HDPE, but better ductility, Free radical 10 billion lb/yr Use chromium compounds. Zieglar-Natta process is recent application. A few number of branches AlR 3, AlHR 2 Natta 4 billion lb/yr Characteristic conditions for PP PP and solid catalysts are put together at 50 ℃ to 90 ℃ below 5atm. After stopping of reaction, it is washed with H 2 O or ROH to remove the catalysts. MW is on the control of chain transfer agent E.g.) CO 2, O 2, H 2, H 2 O, … Zieglar-Natta Catalyst

Hanyang Univ. Spring 2008 Dr. Ziegler and Dr. Natta

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Hanyang Univ. Spring 2008 Polyethylene Polymerization A B C D E

Hanyang Univ. Spring 2008 Chap 13. Polymerization Processes  Homogeneous polymerization  Heterogeneous polymerization Bulk polymerization Solution Polymerization Suspension polymerization Emulsion polymerization

Hanyang Univ. Spring 2008 Bulk polymerization

Hanyang Univ. Spring 2008 Solution Polymerization

Hanyang Univ. Spring 2008 Suspension polymerization

Hanyang Univ. Spring 2008 Emulsion polymerization

Hanyang Univ. Spring 2008 Stages in Emulsion Polymerization