Question 8 1. Polyvinyl alcohol is a useful polymer for films and adhesives. Wha

Question

Question 8

1. Polyvinyl alcohol is a useful polymer for films and adhesives. What monomer is used for the 2. Why do clothing made of PET display static electricity during winter? What would you 3. What is the basic difference between poly(ethylene glycol) (PEG) and poly(ethylene oxide) production of PVA? suggest to offer a permanent solution. Also, discuss any compromise you have to make. (PEO)? Which preparative method(s) would you choose to synthesize them? Write one major application of both polymers 4. Write the mechanism for the cationic ring-opening polymerization of (0) ethylene oxide and S. Discuss briefly the synthesis and properties of representative age-resistant, solvent-resistart 6. HDPE, PP and poly-1-butene (PB-1) possess similarities in that they are all composed of 7. In 1839, Charles Goodyear discovered vulcanization by heating natural rubber with sulfur at (ii) caprolactone. and heat resistant elastomers. aliphatic hydrocarbon chains. Why is HDPE miscible with PP, but not with PB-1? around 130°C, when vulcanization is performed using 2-3 wt.% of sulfur, the product is more durable than virgin natural rubber and is extensively used in automobile tires. Write the mechanism of vulcanization. What would be the properties of the product if natural rubber was treated with 20-30 wt% of sulfur at 130°C? Write the mechanisms, using a standard monomer, for three major controlled free-radical polymerization methods: NMP, ATRP and RAFT. How is SBS thermoplastic elastomer produced commercially? Would BSB triblock copolymer exhibit thermoplastic behavior as SBS does? 10. Outline a synthetic method for the preparation of each of the following oligomers: () Polystyrene with CO2H group at both chain ends and (ii) Polybutadiene with a hydroxyl group at both chain ends. he ABC terpolymer, polystyrene-b-poly(acrylic acid)-b-poly(n-butyl methacrylate), PS-PAA- PnBMA, which consists of a central long polyelectrolyte end-capped by two different hydrophobic I. T exhibits interesting properties, such as being self-organized hierarchically from flower- short blocks, like micelles to dendron-like micellar a network Outline a synthetic route to this amphiphilic triblock copolymer 12. What synthetic strategy would you use to prepare PEO-b-PS-6-PMMA? 13. The followin g bifunctional initiators (1-V) are useful for living anionic polymerization of symmetrical multiblock copolymers. Suggest a convenient synthetic route for cach.

Explanation / Answer

1. PVA is not prepard by the polymerization of vinyl alcohol as that monomer is unstable. Instead the polymer is prepared from vinyl acetate to give polyvinyl acetate. This polymer is then subjected to hydrolysis in mild acidic conditions to afford polyvinyl alcohol.

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