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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. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
end groups
poly- p- phenylene benzobisoxazole PBO
secondary bonding
viscose process
2. Polymer that is made up a single repeat unit
homopolymer
conformation
atactic
polypphenylene terephyhalamide PPTA
3. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
gauche conformation
barrel
end groups
tow
4. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
gauche conformation
graft copolymers
polyamides
5. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
glass transition temperature Tg
viscose process
functionality
atactic
6. 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
High volume thermoplastics HVTP
plyacrylonitrile PAN
die
polyesters
7. Number of bonds a molecule has formed
configuration
homopolymer
atactic
functionality
8. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
monomers
thermoplastics
addition polymerization/chain growth/free- radical polymerization
propagation
9. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water
viscose process
condensation/step- growth polymerization
secondary bonding
petroleum
10. One type of polymer that contains at least 85% of polyacrylonitrile PAN
addition polymerization/chain growth/free- radical polymerization
acrylic
vulcanization
initiation
11. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
mutual termination
configuration
injection molding
vulcanization
12. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
atactic
mutual termination
dyes
conformation
13. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
random copolymers
polymer backbone
blends
propagation
14. First step in the process of polymerization - during which a free radical is formed
screen pack
graft copolymers
initiation
addition polymerization/chain growth/free- radical polymerization
15. 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
freeze line
barrel
isotactic dan
solution spinning
16. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
gauche conformation
blends
polypphenylene terephyhalamide PPTA
syndiotactic dyad
17. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
any carbon with double bonds or repeated substituents
functional groups
primary bonding
elastomers
18. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
oligomers
primary bonding
aramid
freeze line
19. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
rayon
eclipsed conformation/ cis - conformation
mutual termination
20. 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
relative molecular mass RMM
atactic
melt spinning
homopolymer
21. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
propagation
alternating copolymers
polymers
monomers
22. 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
oligomers
freeze line
glass transition temperature Tg
block copolymers
23. 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
hopper
injection molding
plasticizers
termination
24. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
free radical
polyviyl chloride PVC
screen pack
most common condensation/step- growth polymerization occur between....
25. 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
block copolymers
polyurethanes
additives
weight average molecular weight Mw
26. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polyesters
shot size
gauche conformation
High volume thermoplastics HVTP
27. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
additives
asymetric
addition polymerization/chain growth/free- radical polymerization
random copolymers
28. Primary raw material for most polymers
glass transition temperature Tg
petroleum
injection molding
syndiotactic dyad
29. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
additives
tow
elastomers
shot size
30. Is not asymetric and cannot have multiple configurations
thermosets
melt spinning
High volume thermoplastics HVTP
any carbon with double bonds or repeated substituents
31. Relative configuration of adjecent asymmetric carbons
copolymer
polymer backbone
tacticity
configuration
32. Simple polymeric material produced as pellets in large quantities
barrel
High volume thermoplastics HVTP
polymers
monomers
33. Atoms attached to the polymer backbone.
tacticity
most common condensation/step- growth polymerization occur between....
relative molecular mass RMM
side groups/ substituents
34. Covalent bonding of the polymer backbone and side groups
structural unit
primary bonding
screen pack
poly- p- phenylene benzobisoxazole PBO
35. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
graft copolymers
polypphenylene terephyhalamide PPTA
hopper
degree of polymerization DPn
36. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
most common condensation/step- growth polymerization occur between....
thermoplastics
homopolymer
37. Two or more polymers mechanically mixed together but without covalent bonding between them
step- growth/condensation polymerization
glass transition temperature Tg
end groups
blends
38. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
die
any carbon with double bonds or repeated substituents
secondary bonding
cracking
39. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
addition polymerization/chain growth/free- radical polymerization
dyes
configuration
40. Coloring agents that do not dissolve into the polymer
step- growth/condensation polymerization
spinneret
pigments
extruder
41. 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
alternating copolymers
extruder
mutual termination
degree of polymerization DPn
42. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
vinyl monomer
plyacrylonitrile PAN
rayon
relative molecular mass RMM
43. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
hopper
polypphenylene terephyhalamide PPTA
extruder
polyviyl chloride PVC
44. 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
polyesters
tow
degree of polymerization DPn
45. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
free radical
vulcanization
any carbon with double bonds or repeated substituents
46. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
weight average molecular weight Mw
any carbon with double bonds or repeated substituents
initiation
47. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
fillers
glass transition temperature Tg
polymethylmethacrylate PMMA
rayon
48. Low- molecular- weight building blocks repeated in the polymer chain
block copolymers
primary bonding
monomers
configuration
49. Smallest repeating unit in a polymer. aka repeat unit
freeze line
structural unit
High volume thermoplastics HVTP
spinneret
50. 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
barrel
shot size
isotactic dan
die