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There are 20 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each correct answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and each additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers.
\r\n8.1 Of the three polymer types, which one is the most important commercially: (a) thermoplastics, (b) thermosets, or (c) elastomers?
\r\n8.2 Which one of the three polymer types is not normally considered to be a plastic: (a) thermoplastics, (b) thermosets, or (c) elastomers?
\r\n8.3 Which one of the three polymer types does not involve cross-linking: (a) thermoplastics, (b) thermosets, or (c) elastomers?
\r\n8.4 As the degree of crystallinity in a given polymer increases, the polymer becomes denser and stiffer, and its melting temperature decreases: (a) true or (b) false?
\r\n8.5 Which one of the following is the chemical formula for the repeating unit in polyethylene: (a) CH2, (b) C2H4, (c) C3H6, (d) C5H8, or (e) C8H8?
\r\n8.6 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?
\r\n8.7 A branched molecular structure is stronger in the solid state and more viscous in the molten state than a linear structure for the same polymer: (a) true or (b) false?
\r\n8.8 A copolymer is a mixture of the macromolecules of two different homopolymers: (a) true or (b) false?
\r\n8.9 As the temperature of a polymer increases, its density (a) increases, (b) decreases, or (c) remains fairly constant?
\r\n8.10 Which of the following plastics has the highest market share: (a) phenolics, (b) polyethylene, (c) polypropylene, (d) polystyrene, or (e) polyvinylchloride?
\r\n8.11 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?
\r\n8.12 Polystyrene (without plasticizers) is amorphous, transparent, and brittle: (a) true or (b) false?
\r\n8.13 The fiber rayon used in textiles is based on which one of the following polymers: (a) cellulose, (b) nylon, (c) polyester, (d) polyethylene, or (e) polypropylene?
\r\n8.14 The basic difference between low-density polyethylene and high-density polyethylene is that the latter has a much higher degree of crystallinity: (a) true or (b) false?
\r\n8.15 Among the thermosetting polymers, the most widely used commercially is which one of the following: (a) epoxies, (b) phenolics, (c) silicones, or (d) urethanes?
\r\n8.16 The chemical formula for polyisoprene in natural rubber is which of the following: (a) CH2, (b) C2H4, (c) C3H6, (d) C5H8, or (e) C8H8?
\r\n8.17 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?
How do thermoplastic elastomers differ from conventional rubbers?
What is the primary polymer ingredient in natural rubber?
What happens to an elastomer when it is below its glass transition temperature?
Elastomers and thermosetting polymers are both cross-linked. Why are their properties so different?
Cross-linking (curing) of thermosetting plastics is accomplished by one of three ways. Name the three ways
How do the properties of thermosetting polymers differ from those of thermoplastics?
What is the basic difference between low-density and high-density polyethylene?
What is the chemical formula of ethylene, the monomer for polyethylene?
The nylons are members of which polymer group?
What is unique about the polymer cellulose?
Describe the difference in mechanical properties as a function of temperature between a highly crystalline thermoplastic and an amorphous thermoplastic.
In addition to fillers and plasticizers, what are some other additives used with polymers?
What is a plasticizer?
Why are fillers added to a polymer?
What are some of the factors that influence a polymer's tendency to crystallize?
Does any polymer ever become 100% crystalline?
How are a polymer's properties affected when it takes on a crystalline structure?
What is a terpolymer?
Copolymers can possess four different arrangements of their constituent mers. Name and briefly describe the four arrangements.
What is a copolymer?
What is cross-linking in a polymer, and what is its significance?
What does the degree of polymerization indicate?
How do the properties of polymers compare with those of metals?
P.1
\r\nWhat is a polymer?
\r\nP.2
\r\nWhat are the three basic categories of polymers?
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