Homework__5_Solutions

Homework__5_Solutions - Homework #5: Not to be collected....

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Homework #5: Not to be collected. Solutions to the following problems will be posted in one week. Chapter 8 Multiple Choice: 8.1, 8.3, 8.6, 8.10, 8.11, 8.17 Chapter 9 problems: 9.1, 9.2, 9.5 Chapter 13 problems: 13.1, 13.4, 13.6, 13.13, 13.15, 13.16 Chapter 8: 8.1 Of the three polymer types, which one is the most important commercially: (a) thermoplastics, (b) thermosets, or (c) elastomers? Answer . (a). 8.3 Which one of the three polymer types does not involve cross- linking: (a) thermoplastics, (b) thermosets, or (c) elastomers? Answer . (a). 8.6 Degree of polymerization is which one of the following: (a) average number of mers in the molecule chain; (b) proportion of the monomer that has been polymerized; (c) sum of the molecule weights of the mers in the molecule; or (d) none of the above? Answer . (a). 8.10 Which of the following plastics has the highest market share: (a) phenolics, (b) polyethylene, (c) polypropylene, (d) polystyrene, or (e) polyvinylchloride? Answer . (b). 8.11 Which of the following polymers are normally thermoplastic (four best answers): (a) acrylics, (b) cellulose acetate, (c) nylon, (d) phenolics, (e) polychloroprene, (f) polyesters, (g) polyethylene, (h) polyisoprene, and (i) polyurethane? Answer . (a), (b), (c), and (g). 8.17 The leading commercial synthetic rubber is which one of the following: (a) butyl rubber, (b) isoprene rubber, (c) polybutadiene, (d) polyurethane, (e) styrene-butadiene rubber, or (f) thermoplastic elastomers? Answer . (e). Chapter 9: 9.1 A fiberglass composite is composed of a matrix of vinyl ester and reinforcing fibers of E-glass. The volume fraction of E-glass is 35%. The remainder is vinyl ester. The density of the vinyl ester is 0.882 g/cm 3 and its modulus of elasticity is 3.60 GPa. The density of E-glass is 2.60 g/cm 3 and its modulus of
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Homework__5_Solutions - Homework #5: Not to be collected....

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