need help on 15, 16 Vinyl Polymers 14. On the basis of chemical structure, predi
ID: 945232 • Letter: N
Question
need help on 15, 16 Vinyl Polymers 14. On the basis of chemical structure, predict the result of free radical copolymerization of the following monomer pairs: (a) acrylamide and acrylonitrile, (b) ethylene and methyl acrylate, (C) 1,3-butadiene and vinyl stearate (vinyl octadecanoate), (d) chlorotrifluoroethylene and ethyl vinyl ether. When you have made your predictions, consult a polymer handbook and check your answers on the basis of reactivity ratios. 15. Predict the ratio of butadiene to styrene repeating units initially produced by free radical copolymeriza- 16. What weight ratio of the two monomers in the previous problem would be necessary to have twice as 17. Compare the reactivity ratios determined for methyl methacrylate and vinyl acetate by the Q-e scheme tion of an equimolar mixture of the two monomers at 50°C. (Consult Table 6.9.) many butadiene as styrene units in the copolymer? with those determined experimentally (Table 6.9). 18. In the presence of a free radical initiator, furan and maleic anhydride form a 1:1 copolymer at 70°C in benzene solution. In the absence of the initiator, the two reactants form a 1:1 Diels-Alder adduct. The Diels-Alder adduct undergoes polymerization at temperature higher than 70°C to give a polymer iden- tical with the 1:1 copolymer. IR and BC NMR of the polymer exhibited olefinic unsaturation of the type found in the Diels-Alder adduct. What is the most likely structure of the polymer? What other struc- tures might be feasible in the absence of the spectroscopic evidence? (References pertaining to this prob lem: N. G. Gaylord et al., J. Macromol. Sci-Chem. A6, 1459, 1972; B. Kamo et al., Polym. , 6, 121, 1974; Y. A. Ragab and G. B. Butler, J.Polym. Sci., Polym. Let. Ed. 14. 273, 1976; idem, J. Poly Sei., Polym. Chem. Ed., 19, 1175. 1981)Explanation / Answer
answer
15) only one monomer of styrene and one monomer of butadiene
16) weight also same ratio
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