Page 89 - Carrahers_Polymer_Chemistry,_Eighth_Edition

52 Carraher’s Polymer Chemistry

11. Do HDPE and LDPE differ in (a) configuration or (b) conformation?

12. Which is a trans isomer: (a) gutta percha or (b) hevea rubber?
13. Which will have the higher softening point: (a) gutta percha or (b) hevea rubber?
14. Show (a) a head-to-tail, and (b) a head-to-head configuration for PVC.

15. Show the structure of a typical portion of the chain of (a) s-PVC and (b) i-PVC.
16. Show Newman projections of the gauche forms of HDPE.
17. Name polymers whose intermolecular forces are principally (a) London forces, (b) dipole–
dipole forces, and (c) hydrogen bonding.

18. Which will be more flexible: (a) poly(ethylene terephthalate) or (b) poly(butylene
terephthalate)?
19. Which will have the higher glass transition temperature: (a) poly(methylene methacrylate) or
(b) poly(butyl methacrylate)?
20. Which will have the higher T : (a) iPP or (b) aPP?
g
21. Which will be more permeable to a gas at room temperature: (a) iPP or (b) aPP?
22. Under what kind of physical conditions is a linear polymer more apt to form spherulites.
23. What is the full contour length of a molecule of HDPE with a DP of 1,500?
24. Which would be more flexible: (a) poly(methyl acrylate) or (b) poly(methyl methacrylate)?

25. Which would you expect to form “better” helical structures: (a) i-polypropylene or
(b) a-polypropylene?
26. Which would you expect to have a higher melting point (a) nylon-66 or (b) an aramide?
27. What type of hydrogen bonds is present in the internal structure of a globular protein?
28. Which would have the greater tendency to “cold flow” at room temperature: (a) poly(vinyl ace-

tate) (T = 301 K) or (b) PS (T = 375 K)?
g g
29. Which would be least transparent: (a) combination of amorphous and crystalline PS, (b) entirely
crystalline PS, or (c) entirely amorphous PS?
30. Which would be more apt to produce crystallites: (a) HDPE or (b) poly(butyl methacrylate)?

31. Which of the following would you expect to provide strong fibers (a) nylon-66, (b) a-polypropylene,
or (c) wool.
32. Which would tend to be more crystalline when stretched: (a) unvulcanized rubber or
(b) ebonite?
33. Which would be more apt to exhibit side-chain crystallization (a) poly(metnyl methacrylate) or
(b) poly(dodecyl methacrylate)?
34. What must be present in order for movement to occur within a polymer at T or T ?
g m
35. What are the three major forms of cross-linking?

ADDITIONAL READING
Alfrey, T., Gurnee, E. F. (1956): Dynamics of viscoelastic behavior, in Rheology-Theory and Applications,
F. R. Eirich, ed., Academic Press, NY.
Bicerano, J. (2002): Prediction of Polymer Properties, Dekker, NY.
Bower, D. (2002): An Introduction to Polymer Physics, Cambridge University Press, Ithaca.
Cheng, S. (2008): Phase Transitions in Polymers: The Role of Metastable States, Elsevier, NY.
nd
Campbell, D., Pethrick, R., White, J. R. (2000): Polymer Characterization: Physical Techniques, 2 Ed.,
Stanley Thornes, Cheltenham, UK.
nd
Ciferri, A. (2005): Supramolecular Polymer, 2 Ed., Taylor & Francis, Boca Raton, FL.
Ellis, B. (2008): Polymers: A Property Database, CRC, Boca Raton, FL.
Flory, P. J. (1953): Principles of Polymer Chemistry, Cornell University Press, Ithaca.
Geil, P. H. (1963): Polymer Single Crystals, Wiley, NY.
Henkel, M., Plemling, M., Sanctuary, R. (2007): Ageing and the Glass Transition, Springer, NY.
Howell, B., Zaikow, G. (2008): Compounds and Materials with Specifi c Properties, Nova, Hauppauge, NY.
Mandelkern, L (2004): Crystallization of Polymers-Kinetics and Mechanisms, Cambridge University Press,
Ithaca.

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