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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. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
structural unit
plyacrylonitrile PAN
polyviyl chloride PVC
copolymer
2. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
spinneret
atactic
homopolymer
3. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
step- growth/condensation polymerization
secondary bonding
any carbon with double bonds or repeated substituents
4. One type of polymer that contains at least 85% of polyacrylonitrile PAN
structural unit
acrylic
end groups
plasticizers
5. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
viscose process
structural unit
polyviyl chloride PVC
6. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
end groups
most common condensation/step- growth polymerization occur between....
shot size
7. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
solution spinning
thermosets
eclipsed conformation/ cis - conformation
elastomers
8. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
conformation
relative molecular mass RMM
vulcanization
aramid
9. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
injection molding
tow
configuration
functional groups
10. 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
glass transition temperature Tg
screen pack
homopolymer
melt spinning
11. Double bounded organic molecule used to begin addition polymerization
fillers
vinyl monomer
staggered conformation
elastomers
12. Covalent bonding of the polymer backbone and side groups
polyesters
mutual termination
secondary bonding
primary bonding
13. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
structural unit
viscose process
extruder
polymethylmethacrylate PMMA
14. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
shot size
number average molecular weight Mn
extruder
primary termination
15. Polymers that contain amide (- N-) groups in the chain
polyamides
step- growth/condensation polymerization
weight average molecular weight Mw
block copolymers
16. Coloring agents that do not dissolve into the polymer
atactic
additives
polyviyl chloride PVC
pigments
17. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
primary bonding
aramid
oligomers
copolymer
18. Porcess of breaking large organic hydrocarbons into smaller molecules
initiation
polyurethanes
cracking
screen pack
19. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
number average molecular weight Mn
melt spinning
petroleum
20. 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
polymethylmethacrylate PMMA
glass transition temperature Tg
mutual termination
staggered conformation
21. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
vulcanization
rayon
dyes
polypphenylene terephyhalamide PPTA
22. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
functional groups
acrylic
blends
23. Relative configuration of adjecent asymmetric carbons
freeze line
shot size
any carbon with double bonds or repeated substituents
tacticity
24. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
die
graft copolymers
propagation
polymethylmethacrylate PMMA
25. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
eclipsed conformation/ cis - conformation
primary bonding
poly- p- phenylene benzobisoxazole PBO
26. 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
weight average molecular weight Mw
barrel
graft copolymers
vulcanization
27. First step in the process of polymerization - during which a free radical is formed
elastomers
step- growth/condensation polymerization
initiation
atactic
28. Number of repeat/structural units in a polymer chain
acrylic
thermosets
injection molding
degree of polymerization DPn
29. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
addition polymerization/chain growth/free- radical polymerization
nylon
spinneret
30. Molecule containing a highly reactive unpaired electron
primary bonding
polyamides
screen pack
free radical
31. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
extruder
blends
plasticizers
32. Conformation in which the largest substituents are offset by 180
trans - conformation
functionality
shot size
graft copolymers
33. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
staggered conformation
polymethylmethacrylate PMMA
rayon
34. Number of bonds a molecule has formed
functionality
secondary bonding
any carbon with double bonds or repeated substituents
functional groups
35. Atoms attached to the polymer backbone.
tow
petroleum
side groups/ substituents
number average molecular weight Mn
36. 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
polyesters
plasticizers
conformation
polymers
37. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
coloring agents
polymethylmethacrylate PMMA
graft copolymers
polyurethanes
38. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
die
tacticity
step- growth/condensation polymerization
39. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
degree of polymerization DPn
cracking
freeze line
pigments
40. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
addition polymerization/chain growth/free- radical polymerization
cracking
die
hopper
41. 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
polyamides
condensation/step- growth polymerization
polymers
asymetric
42. Conformation that occurs when the largest substituent in a molecule are offset by 60
condensation/step- growth polymerization
gauche conformation
solution spinning
polymer backbone
43. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
die
pigments
polymer backbone
condensation/step- growth polymerization
44. 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
random copolymers
aramid
block copolymers
melt spinning
45. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
screen pack
petroleum
primary termination
quenching
46. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
polymethylmethacrylate PMMA
polyurethanes
free radical
47. Broad category of polymers that includes polymers containing urethane linkages
aramid
polyurethanes
screen pack
tow
48. An acid and an alcohol
number average molecular weight Mn
solution spinning
functionality
most common condensation/step- growth polymerization occur between....
49. Additives whose primary purpose is to reduce the final cost of the product
configuration
gauche conformation
fillers
nylon
50. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
relative molecular mass RMM
polyurethanes
functionality