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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. Primary raw material for most polymers
blends
petroleum
alternating copolymers
eclipsed conformation/ cis - conformation
2. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
trans - conformation
primary termination
injection molding
polyamides
3. 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
glass transition temperature Tg
petroleum
asymetric
polymers
4. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
plasticizers
blends
alternating copolymers
elastomers
5. Coloring agents that do not dissolve into the polymer
freeze line
pigments
barrel
asymetric
6. Broad category of polymers that includes polymers containing urethane linkages
acrylic
polyurethanes
block copolymers
monomers
7. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
extruder
tow
polymer backbone
glass transition temperature Tg
8. 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
mutual termination
functional groups
fillers
solution spinning
9. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
degree of polymerization DPn
spinneret
aramid
functional groups
10. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
syndiotactic dyad
vulcanization
coloring agents
polymethylmethacrylate PMMA
11. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
isotactic dan
polymethylmethacrylate PMMA
mutual termination
addition polymerization/chain growth/free- radical polymerization
12. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
shot size
polymethylmethacrylate PMMA
polyamides
13. Conformation that occurs when the largest substituent in a molecule are offset by 60
quenching
fillers
gauche conformation
plyacrylonitrile PAN
14. Pigments or dyes that change the way light is absorbed or reflected by a polymer
primary termination
staggered conformation
High volume thermoplastics HVTP
coloring agents
15. Softening agents
copolymer
coloring agents
blends
plasticizers
16. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
eclipsed conformation/ cis - conformation
side groups/ substituents
homopolymer
17. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
pigments
number average molecular weight Mn
functional groups
acrylic
18. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
tacticity
gauche conformation
structural unit
alternating copolymers
19. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
staggered conformation
quenching
addition polymerization/chain growth/free- radical polymerization
20. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
relative molecular mass RMM
primary termination
syndiotactic dyad
copolymer
21. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
nylon
viscose process
relative molecular mass RMM
22. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
petroleum
staggered conformation
screen pack
eclipsed conformation/ cis - conformation
23. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
pigments
elastomers
condensation/step- growth polymerization
hopper
24. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
petroleum
mutual termination
functional groups
25. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
screen pack
barrel
configuration
number average molecular weight Mn
26. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA
freeze line
block copolymers
trans - conformation
polymethylmethacrylate PMMA
27. 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
melt spinning
quenching
blends
elastomers
28. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
additives
constitution
coloring agents
29. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
mutual termination
poly- p- phenylene benzobisoxazole PBO
solution spinning
conformation
30. Conformation in which the largest substituents are offset by 180
syndiotactic dyad
condensation/step- growth polymerization
trans - conformation
aramid
31. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
nylon
asymetric
side groups/ substituents
polypphenylene terephyhalamide PPTA
32. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
screen pack
polypphenylene terephyhalamide PPTA
melt spinning
rayon
33. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
secondary bonding
primary bonding
conformation
propagation
34. Low- molecular- weight building blocks repeated in the polymer chain
elastomers
branching
polymers
monomers
35. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
poly- p- phenylene benzobisoxazole PBO
quenching
blends
condensation/step- growth polymerization
36. Polymer that is made up a single repeat unit
copolymer
homopolymer
vinyl monomer
plasticizers
37. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
barrel
additives
thermosets
atactic
38. First step in the process of polymerization - during which a free radical is formed
random copolymers
petroleum
initiation
primary termination
39. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
mutual termination
spinneret
syndiotactic dyad
fillers
40. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
graft copolymers
thermoplastics
barrel
41. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
primary termination
polyurethanes
any carbon with double bonds or repeated substituents
42. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
polyamides
mutual termination
plyacrylonitrile PAN
end groups
43. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
weight average molecular weight Mw
coloring agents
rayon
44. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
thermoplastics
nylon
vinyl monomer
quenching
45. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
polyurethanes
alternating copolymers
functionality
46. 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
step- growth/condensation polymerization
vinyl monomer
random copolymers
aramid
47. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn
aramid
isotactic dan
number average molecular weight Mn
oligomers
48. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber
extruder
barrel
glass transition temperature Tg
plasticizers
49. 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
polyurethanes
primary termination
polyesters
mutual termination
50. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
glass transition temperature Tg
isotactic dan
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO