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Problem Set #2 For each of the following monomers, draw structures and identify each of possible stereochemical forms of repeat units that can be formed during chain polymerization: s CI F F in-butyl acrylate vinylidine fluoride chloroprene 1. Discuss the mechanism by which stereoregular polyolefins are formed in heterogeneous coordination polymerization. Describe the polymerization conditions that may be used to produce (a) isotactic and (b) syndiotactic polypropylene. 2. Draw the structures of the monomers and outline the type of ring-opening polymerization you would use to synthesize the following polymers: Not thm n tiont n they NC CN n o, In (Si, n n CF3 (a) (b) (c) (d) (e) (f) 3. Describe with the aid of chemical reaction schemes: (a) the major limitation to synthesizing poly(propylene oxide) by anionic polymerization of propylene oxide with potassium alkoxide; and (b) alternative anionic polymerization conditions that can be used to overcome this limitation. 4. (a) Describe the key mechanistic steps in the ring-opening metathesis polymerization (ROMP) of cyclopentene with ruthenium alkylidine complex: Ph [Ru] ROMP (b) Show the chemical structures of the repeating units and end-groups of polymers prepared by ROMP of the following monomers: o N o

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