高分子复习.doc

Define the following terms. 定义下列概念
1. Condensation polymerization and Free radical polymerization reaction
2. Monomer, Oligomer, the repeating unit
3. Alternating copolymer, Block copolymer
4. Branched Polymer, syndiotactic polymer, atactic polymer
5. Crosslinking, vulcanization
6. Chain Transfer, Initiation, Propagation, and Termination
7. Thermoset and Thermoplastic
8. Glass Transition Temperature
9. Plasticizers, Ziegler-Natta catalysts
10. pression molding, Extrusion, Injection and Blow molding
Multiple choices. 单选
1. Tire cords, the film used as backing for magnetic recording tape in audio and video cassettes, and plastic soft-drink bottles are all posed of what polymers? D
a. poly(tetrafluoroethylene)
b. high-density polyethylene
c. nylon
d. poly(ethylene terephthalate)
2. What term is used to indicate a polymerization that occurs without the growth of a chain monomer by monomer, but instead occurs as monomers form dimers, dimers form tetramers, etc.? C
a. Non-chain
b. Discontinuous
c. step-growth
d. irregular-increment
3. Who developed catalysts that can produce, exclusively, either isotactic or syndiotactic polymers? B
a. Carothers
b. Ziegler and Natta
c. Staudinger
d. Goodyear
4. Who gave the macromolecular hypothesis? C
a. Carothers
b. Ziegler and Natta
c. Staudinger
d. Goodyear
5. Fabrics or films made of which of the following polymers are most sensitive to damage from solutions of strong bases? A
a. Nylon
b. Polyethylene
c. poly(vinyl chloride)
d. polystyrene
6. Who produced billiard balls using collodian as a substitute for ivory? A
a. Hyatt
b. Stine
c. Goodyear
d. Staudinger
7. In which polymer is -(-CF2-CF2-)n- the repeating unit? D
a. Acrilan
b. Orlon
c. Lucite
d. Teflon
8. The repeat unit in a polymer is called the A
a. monomer
b. oligomer
c. degree of polymerization
d. mer
9. The smallest repeating unit of a polymer is: B
a. Polymers
b. Monomers
c. Oligomers
d. dimer
10. In a Isotactic polymer, A
a. the side groups on a polymer chain are all generally on the same side of the polymer chain.
b. the side groups of the polymer chain generally alternate their orientation from one side to the other.
c. the side groups of the polymer chain occur randomly on both sides of the polymer chain.
d. there are no side groups on the polymer chain.
11. Latex is the source of: C
a. nylon.
b. isoprene.
c. natural rubber.
d. cis-1,4-polybutadiene.
12. The type of polymer that is linear and distorts with heat is called C
a. cross-linked
b. thermoset
c. thermoplastic
d. highly branched
13. PE polymerization occurs in steps with the following order: B
a.    initiation, activation, propagation, termination
b.    activation, initiation, propagation, termination
c.    propagation, initiation, activation, termination
d.    termination, activation, initiation, propagation
14. If A and B represent mers in a polymer, which is the random copolymer A
a. AAAABABBABABBB
b. AAABBBAAABBBAA
c  AABBBBAABBBBAABBBB
d. none above
15. A blend is A
a. a physical mixture
b. a pound
c. bound together by primary bonds only
d. a single phase material
16. With increasing concentration of plasticizer the modulus of PVC B
a. increases
b. decreases
c. stays the same
d. none above
17. PVC tubing is being used for transporting water. If organic solvents are run through this tubing it bees stiff and somewhat brittle. This is because C
a. The solvent plasticizes the tubing, raising the Tg
b. The solvent removes plasticizer, lowering the Tg
c. The solvent removes plasticizer raising the Tg
d. The solvent plasticizes the tubing, lowering the Tg
18. What are the major advantages of plastics pared to ceramics, glasses and metallic materials? B
a. Low strength and high-temperature resistant
b. Lightweight and corrosion-resistant
c. High-temperature resistant and insulating
d. High stiffness and corrosion-resistant
19. Consider the properties of the following two polyethylene samples. Sample 1 was produced by a high pressure process while sample 2 was synthesized using a catalyst.
Polyethylene 1 Polyethylene 2
Mol wt. 200,000 200,000
Density (g/cm3) 0.92 0.96
Crystalline melting pt. 108°C 133°C
Stiffness (lb/in2x103) 25 125
Hardness (Shore D) 45 65
Which of the following statements is true? B
a. Sample 2 is more branched than sample 1
b. Sample 1 is more branched than sample 2
c. Sample 1 is more atactic
d. Sample 1 is more isotactic
20. Consider the two transitions from the “solid” to the liquid or rubbery state shown below on a plot of specific volume vs. temperature; D

a. The transition X is a Tg while transition Y is a crystalline melting point.
b. Y is the Tg while X is the Tm.
c. X is the Tm (melting point ) of a semi-crystalline material and Y is the Tm of an almost perfect crystal.
d. none above
21. What monomers are most monly used in addition polymerization? C
a. carboxylic acids
b. esters
c. alkenes
d. amides
22. Linear polymers tend to be A
a. thermoplastic
b. thermoelastic
c. thermophillic
d. thermoset
23. Thermoplastic elastomers bine features of both thermoplastics and elastomers. At high temperature, these polymers behave as and are plastically formed into shapes; at low temperature, they behave as . A
a. Thermoplastics; elastomers
b. Thermoplastics; thermosetting polymers
c. Elastomers; thermoplastics
d. Elastomers; thermosetting polymers
24. PVC is _________ since it is a ________polymer B
a. thermoset, linear
b. thermoplastic, linear
c. thermoset, crosslinked
d. thermoplastic, crosslinked
25. High density polyethylene cooled slowly from 160°C to room temperature B
a. Is still amorphous.
b. Crystallizes.
c. Is a glass.
d. Is a mixture where some regions are rubbery and some regions are glassy.
26. Atactic polystyrene (Tg ~ 100°C) quenched (i.e., cooled very quickly) from 120°C to room temperature A
a. Is still amorphous.
b. Crystallizes.
c. Is a glass.
d. Is a rubbery material.
27. Vinyl polymers include all of the following except C
a. polyethylene
b. polyvinyl chloride
c. PMMA
d. Polystyrene
28. Which of the following materials is copolymer? D
a. PP
b. SBS
c. PVC
d. PA
29. Which of the following polymers would you expect to be most suitable for the production of a rubber car bumper guard? B
a. Atactic polystyrene (Tg ~ 100°C)
b. A random ethylene/propylene copolymer (50/50 position) Tg ~ –40°C).

c. Low density polyethylene.
d. High density polyethylene.
30. Which processing way can manufacture film, unless A
a. Extrusion
b. Injection
c. Blow molding
d. Calendering
31. Which pairs of monomers would you use to make a polyester? C
a. Phenol and formaldehyde
b. Styrene and butadiene
c. Terephthalic acid and ethylene glycol
d. Ethylene and propylene
32. Which of the following polymers is most likely to be optically transparent A
a. Atactic polystyrene
b. Isotactic polystyrene
c. Linear Polyethylene
d. Nylon 6,6
33. Melt fracture occurs B
a. When chain molecular weight is too high
b. When a polymer is extruded too quickly
c. When a polymer is extruded too slowly
d. When a polymer close to its Tg is extruded.
34. Consider the stress/strain diagrams shown below. Which of these would most closely correspond to the mechanical behavior of Isotactic polypropylene? A

a. curve A
b. curve B
c. curve C
d. none above
35. In mercial practice, poly(ethylene terephthalate), or PET, is manufactured by what chemical transformation? C
a. Transesterification
b. reaction of an acyl chloride with a diol
c. condensation of a diacid and a diol
d. copolymerization with a Ziegler-Natta catalyst
36. A plasticizer is used to: D
a. convert a rubber to a glassy plastic.
b. convert a thermoplastic to a glass.
c. decrease chain-branching during a polymerization.
d. soften a mercial plastic.
37. Microscopic regions of highly ordered polymer chains, found at low temperatures within solid polymers, are called: A
a. crystallites.
b. amorphous regions.
c. microsolids.
d. microcells.
38. Electron Microscopes can NOT yield the following information. C
a. Morphology
b. position
c. Deposition temperatures
d. Crystallographic Information
39. Capillary rheometers are not used to measure: C
a. Shear viscosity
b. Die swell
c. crystallinity
d. Melt fracture
40. Glass transition temperature (Tg) is detectable by a variety of methods, NOT including C
a. Thermal-Mechanical Analysis (TMA).
b. Differential Scanning Calorimetry (DSC)
c. Scanning electron microscopy(SEM)
d. Dynamic Mechanical Analysis DMA