{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW5solf10

# HW5solf10 - initial amount of monomer is used up but before...

This preview shows page 1. Sign up to view the full content.

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
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online