HW5solf10 - initial amount of monomer is used up, but...

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Homework #5 Solutions 1. x n = M [ ] 0 I 0 [ ] x = 2 mol /L 0.001 mol /L 0.75 ( ) = 1500 For polystyrene, the molecular weight of a repeat unit is 104.15 g/mol, so: M n = 1500 (104.15 g/mol) = 156,225 g/mol PDI = 1 + 1 x n = 1 + 1 1500 = 1.0007 PDI = M w M n M w = PDI x M n = 1.0007 ( ) 156,225 g / mol ( ) = 156,334 g / mol 2. a. There are three ways: increase initial monomer concentration; decrease initial initiator concentration; or since this is a living polymerization, add more monomer after the
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Unformatted text preview: initial amount of monomer is used up, but before you terminate it by adding water. b. Decrease temperature, or use a less polar solvent. c. Add an inhibitor. d. Use a metallocene or single site catalyst instead of a traditional Ziegler-Natta catalyst. e. Use a Ziegler-Natta or metallocene catalyst, and copolymerize the propylene with short alkenes like hexene or octene....
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This note was uploaded on 11/16/2011 for the course EMA 3066 taught by Professor Douglass during the Fall '10 term at University of Florida.

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