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254 Carraher’s Polymer Chemistry

13. Why are most elastomers difficult to recycle?

14. What is the composition of the first copolymer chains produced by the copolymerization of

equimolar quantities of styrene and methyl methacrylate in (a) free radical, (b) cationic, and
(c) anionic copolymerization?

15. What is the composition of the first copolymer butyl rubber chains produced from equimolar
quantities of the two monomers?
16. What is the composition of the first copolymer butyl rubber chains produced from a feed con-

taining 9 mol of isobutylene and 1 mol of isoprene?
17. How would you ensure that production of butyl rubber of uniform composition occurs in
question 16.
18. For a graft copolymer with a backbone derived from monomer A and the graft B what often
occurs when B is long?

19. What is the composition of the first polymer chains produced by the copolymerization of equi-
molar quantities of VC and VAc?
20. What are the advantages, if any, of the VC–VAc copolymer over PVC itself?
21. Why are ionomers superior to LDPE?
22. What is the difference between buna-S, GRS, and SBR?
23. How can you connect two different phases in polymer blends?
24. Which sequence in the ABA block copolymer of ethylene oxide and propylene oxide is more
lyophilic?
25. When will a blend exhibit two distinct properties.
26. Are dendrites really polymeric?
27. What product is obtained if 1.5 mol of styrene is copolymerized with 1 mol of maleic anhydride
in benzene?
28. Why are ionomers referred to as processable thermosets?
29. Of what use is the copolymerization equation?
30. How could you use graft-copolymerization techniques to reduce the water solubility of starch?
31. What is the end group when azobiscyanopentanoic acid is used as an initiator?
32. What are some advantages of ionomers?
33. In the synthesis of dendrites, why must some of the reactants have a functionality greater than
two?
34. Why do companies often emphasize only selected materials and/or processes?
35. How might the properties of two polymers containing the same amounts of monomer A
and B differ if one polymer is a simple random copolymer and the other polymer is a block
copolymer?
36. Name one important property of an elastomer.
37. What are potential useful properties of dendrites?

ADDITIONAL READING
Alfrey, T., Bohrer, J. Mark, H. (1952): Copolymerization, Interscience, NY.
Bhattacharya, A., Ray, P., Rawlins, J. (2008): Polymer Grafting and Crosslinking, Wiley, Hoboken, NJ.
Brandrup, J., Immergut, E. (1965): Polymer Handbook, Wiley, NY.
Calleja, F., Roslaniec, Z. (2000): Block Copolymers, Dekker, NY.
Carraher, C., Moore, J. A. (1984): Modifi cation of Polymers, Plenum, NY.
nd
Ciferri, A. (2005): Supramolecular Polymers, 2 Ed., Taylor and Francis, Boca Raton, FL.
Dragan, E. S. (2006): New Trends in Nonionic (Co)polymers and Hybrids, Nova, Commack, NJ.
Eisenberg, A., Kim, J. S. (1998): Introduction to Ionomers, Wiley, NY.
Frechet, J. (2002): Dendrimers and Other Dendritic Polymers, Wiley, NY.
Frechet, J., Tomalia, D. (2002): Dendrimers and Other Dendritic Polymers, Wiley, NY.
nd
Gupta, R. K. (2000): Polymer and Composite Rheology, 2 Ed., Dekker, NY.

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