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Draw isotactic triad of polystyrene and ABCN.
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- What is molecular shape/conformation of polymer? What is the main characteristic ofpolymer affected by molecular shape?Draw the isotactic, syndiotactic, and atactic form of polypropylene in kekule structure.State whether it is possible to determine whether one polymer is more likely to crystallize than the other. If it is possible, note which is the more likely and then cite reason(s) for your choice. If it is not possible to decide, state why. a) Linear and syndiotactic poly(vinyl chloride); linear and isotactic polystyrene b) Network phenol-formaldehyde; linear and heavily crosslinked cis-isoprene c) Linear polyethylene; lightly branched isotactic polypropylene d) Alternating poly(styrene-ethylene) copolymer; random poly(vinyl chloridetetrafluoroethylene) copolymer wwaw m
- into the book. Write a concise definition of each, using examples as appropriate.(a) Compute the repeat unit molecular weight of polyethylene. (b) Compute the number-average molecular weight for a polyethylene for which the degree of polymerization is 22000Linear and syndiotactic poly(vinyl chloride); linear and isotactic polystyrene • State whether it is possible to determine whether one polymer is more likely to crystallize than the other. • If it is possible, note which is the more likely and then cite reason(s) for your choice. • If it is not possible to decide, state why.
- (5) Determine (if possible) which polymer is more likely to crystallize: a) branched atactic polypropylene vs. linear syndiotactie polypropylene b) network melamine (pg. A36) vs. lightly-crosslinked (5%) polyethylene c) linear polyethylene vs. linear polystyrene d) graft poly(styrene-butadiene) vs. alternating poly(chloroprene-isobutylene) e) heavily-crosslinked polyethylene terephthalate (PET) vs. phenol-formaldehyde8. When an equilibrium step-growth polymerization is 99% complete, what fraction of the reaction mixture is still monomer (a) on mole basis and (b) on weight basis ?d) Early in the polymerization at lower conversion of the MVK monomer, the polymer chains formed are primarily linear. However, close to the end of the reaction, as most of the monomer is consumed, branched polymers may start to appear. Propose a possible rationale for the formation of branched polymer structures (hint: consider the types of termination reactions that may compete with polymerization when only little monomer is still present). 로 3 3 linear vs. branched
- 9. Consider the two polymers Nylon 6,10, with the degree of polymerization of 100 and poly(ethyl methacrylate) with the degree of polymerization of 1200. (a) Write chemical structures of the polymers. (b) What polymer will have a higher value of real end-to-end distance in bulk? Assume that the values of characteristic ratio and bond length are the same for these polymers. 1/2 The equation for the end-to-end distance: (²) 11² = α (nCN) 1/21Outline some methods for obtaining ultra-high orientation in polymers (e.g. Kevlar).Discuss the reasons for the differences in glass transition temperature for the following pairs of polymers. Hint: check factors that affect Tg Polyethylene (-120°C) and polypropylene (-20°C)
