HW3-Solutions.pdf - 26 pts total EMA 3066 Fall 2019 Name Homework 3 Free radical polymerizations Solutions(You must show all work for credit 8 pts Gower

HW3-Solutions.pdf - 26 pts total EMA 3066 Fall 2019 Name...

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1 EMA 3066- Fall 2019 Name: Gower Homework # 3- Free radical polymerizations- Solutions (You must show all work for credit) 1) Instead of benzoyl peroxide, another popular initiator used in free radical polymerizations is AIBN, shown below. Sketch the 2 initiation steps of a polymerization of poly(vinyl chloride) (PVC) using this AIBN initiator. Show full or half arrows for electron movements. Note- its decomposition behaves analogously to the peroxide, but with release of N 2 instead of CO 2 . 1) Decomposition of initiator to form active 2R* (and N 2 ) 2) Initiate a chain with one of the R* 8 pts 4 pt 4 pt H 3 C C CH 3 C N N N C CH 3 C N CH 3 H 3 C C CH 3 C N C CH 3 C N CH 3 N N More accurate bond angles More accurate bond angles 26 pts total
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2 2) Sketch the two possible termination reactions for PVC, showing where the electrons go. As I did in the lecture notes, you can draw the chain as a zig zag up until the last repeat unit.
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