SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Carbon atom capable of multiple configurations due to four different substituents
asymetric
polymers
eclipsed conformation/ cis - conformation
initiation
2. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
syndiotactic dyad
pigments
dyes
thermoplastics
3. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
syndiotactic dyad
extruder
poly- p- phenylene benzobisoxazole PBO
cracking
4. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
High volume thermoplastics HVTP
stabilizers
polypphenylene terephyhalamide PPTA
block copolymers
5. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
weight average molecular weight Mw
gauche conformation
conformation
6. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units
functional groups
isotactic dan
step- growth/condensation polymerization
atactic
7. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
blends
dyes
quenching
alternating copolymers
8. 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
alternating copolymers
mutual termination
step- growth/condensation polymerization
block copolymers
9. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
monomers
quenching
graft copolymers
10. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
relative molecular mass RMM
propagation
freeze line
tow
11. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
quenching
aramid
addition polymerization/chain growth/free- radical polymerization
12. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functionality
spinneret
acrylic
functional groups
13. 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
graft copolymers
tow
block copolymers
die
14. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
conformation
mutual termination
injection molding
tacticity
15. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
free radical
polymer backbone
alternating copolymers
viscose process
16. First step in the process of polymerization - during which a free radical is formed
tacticity
branching
tow
initiation
17. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
injection molding
poly- p- phenylene benzobisoxazole PBO
alternating copolymers
18. Relative configuration of adjecent asymmetric carbons
tacticity
freeze line
isotactic dan
free radical
19. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath
solution spinning
primary bonding
coloring agents
freeze line
20. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
shot size
poly- p- phenylene benzobisoxazole PBO
polypphenylene terephyhalamide PPTA
21. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
blends
poly- p- phenylene benzobisoxazole PBO
primary termination
22. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
High volume thermoplastics HVTP
copolymer
cracking
23. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
screen pack
stabilizers
trans - conformation
polyamides
24. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
polypphenylene terephyhalamide PPTA
monomers
functionality
25. Covalent bonding of the polymer backbone and side groups
polymers
termination
eclipsed conformation/ cis - conformation
primary bonding
26. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
oligomers
configuration
plyacrylonitrile PAN
hopper
27. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
alternating copolymers
acrylic
poly- p- phenylene benzobisoxazole PBO
elastomers
28. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
functionality
nylon
spinneret
oligomers
29. Polymer that is made up a single repeat unit
High volume thermoplastics HVTP
nylon
homopolymer
atactic
30. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
elastomers
isotactic dan
plyacrylonitrile PAN
shot size
31. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
plasticizers
quenching
polymer backbone
cracking
32. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
conformation
thermosets
termination
weight average molecular weight Mw
33. 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
degree of polymerization DPn
homopolymer
melt spinning
dyes
34. Softening agents
constitution
fillers
plasticizers
polypphenylene terephyhalamide PPTA
35. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
cracking
addition polymerization/chain growth/free- radical polymerization
plasticizers
graft copolymers
36. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior
secondary bonding
injection molding
shot size
weight average molecular weight Mw
37. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
blends
petroleum
spinneret
polymethylmethacrylate PMMA
38. Conformation that occurs when the largest substituent in a molecule are offset by 60
thermosets
mutual termination
rayon
gauche conformation
39. Additives whose primary purpose is to reduce the final cost of the product
dyes
fillers
graft copolymers
melt spinning
40. Low- molecular- weight building blocks repeated in the polymer chain
monomers
polyviyl chloride PVC
alternating copolymers
homopolymer
41. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
polymer backbone
dyes
High volume thermoplastics HVTP
isotactic dan
42. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
monomers
addition polymerization/chain growth/free- radical polymerization
primary termination
polyurethanes
43. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
coloring agents
freeze line
High volume thermoplastics HVTP
functional groups
44. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
free radical
weight average molecular weight Mw
end groups
secondary bonding
45. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
polyviyl chloride PVC
homopolymer
thermosets
screen pack
46. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
addition polymerization/chain growth/free- radical polymerization
stabilizers
conformation
47. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
pigments
block copolymers
trans - conformation
eclipsed conformation/ cis - conformation
48. Coloring agents that do not dissolve into the polymer
pigments
cracking
blends
oligomers
49. Covalently bonded chains of molecules with small monomer units repeated from end to end
tacticity
polymers
termination
propagation
50. 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
nylon
syndiotactic dyad
polymers