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Test your basic knowledge |
Modern Material Science And Engineering 2
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
elastomers
spinneret
homopolymer
die
2. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
plasticizers
copolymer
branching
3. Carbon atom capable of multiple configurations due to four different substituents
polyesters
primary bonding
alternating copolymers
asymetric
4. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
cracking
homopolymer
functional groups
5. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
eclipsed conformation/ cis - conformation
dyes
vulcanization
monomers
6. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
glass transition temperature Tg
pigments
injection molding
7. Is not asymetric and cannot have multiple configurations
gauche conformation
any carbon with double bonds or repeated substituents
petroleum
branching
8. Softening agents
plasticizers
High volume thermoplastics HVTP
trans - conformation
die
9. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
barrel
plasticizers
alternating copolymers
tacticity
10. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible
polyamides
glass transition temperature Tg
constitution
configuration
11. Atoms attached to the polymer backbone.
dyes
elastomers
side groups/ substituents
solution spinning
12. Conformation in which the largest substituents are offset by 180
conformation
random copolymers
High volume thermoplastics HVTP
trans - conformation
13. Relative configuration of adjecent asymmetric carbons
tacticity
primary termination
glass transition temperature Tg
conformation
14. Polymer that is made up a single repeat unit
monomers
viscose process
homopolymer
fillers
15. An acid and an alcohol
cracking
most common condensation/step- growth polymerization occur between....
plasticizers
isotactic dan
16. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
alternating copolymers
polymer backbone
conformation
polypphenylene terephyhalamide PPTA
17. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube
die
thermosets
structural unit
extruder
18. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
isotactic dan
polyviyl chloride PVC
thermoplastics
aramid
19. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water
staggered conformation
step- growth/condensation polymerization
isotactic dan
polymethylmethacrylate PMMA
20. Conformation that occurs when the largest substituent in a molecule are offset by 60
conformation
any carbon with double bonds or repeated substituents
polymer backbone
gauche conformation
21. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight
trans - conformation
High volume thermoplastics HVTP
polymers
relative molecular mass RMM
22. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
polyesters
termination
relative molecular mass RMM
barrel
23. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
pigments
most common condensation/step- growth polymerization occur between....
polyurethanes
24. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
plasticizers
propagation
condensation/step- growth polymerization
thermoplastics
25. Pigments or dyes that change the way light is absorbed or reflected by a polymer
spinneret
block copolymers
coloring agents
extruder
26. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
functionality
copolymer
hopper
dyes
27. Primary raw material for most polymers
petroleum
polyviyl chloride PVC
primary bonding
polymethylmethacrylate PMMA
28. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
plasticizers
polyamides
solution spinning
29. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
block copolymers
poly- p- phenylene benzobisoxazole PBO
oligomers
30. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
plasticizers
structural unit
polyamides
31. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
coloring agents
additives
primary termination
eclipsed conformation/ cis - conformation
32. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
syndiotactic dyad
thermosets
functionality
33. Coloring agents that do not dissolve into the polymer
isotactic dan
tacticity
acrylic
pigments
34. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
additives
constitution
asymetric
polypphenylene terephyhalamide PPTA
35. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process
block copolymers
stabilizers
condensation/step- growth polymerization
mutual termination
36. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
acrylic
oligomers
secondary bonding
monomers
37. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
pigments
thermosets
monomers
38. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared
mutual termination
secondary bonding
tacticity
polyesters
39. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
branching
addition polymerization/chain growth/free- radical polymerization
rayon
40. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
functionality
copolymer
thermosets
41. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret
any carbon with double bonds or repeated substituents
structural unit
block copolymers
melt spinning
42. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
trans - conformation
dyes
syndiotactic dyad
43. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tacticity
tow
cracking
polyviyl chloride PVC
44. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
polymethylmethacrylate PMMA
freeze line
free radical
45. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
dyes
mutual termination
acrylic
quenching
46. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
petroleum
rayon
die
shot size
47. Additives whose primary purpose is to reduce the final cost of the product
propagation
polymethylmethacrylate PMMA
random copolymers
fillers
48. Smallest repeating unit in a polymer. aka repeat unit
thermosets
structural unit
end groups
relative molecular mass RMM
49. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
termination
condensation/step- growth polymerization
tacticity
50. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
any carbon with double bonds or repeated substituents
vinyl monomer
melt spinning
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