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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. One type of polymer that contains at least 85% of polyacrylonitrile PAN
asymetric
barrel
plasticizers
acrylic
2. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
glass transition temperature Tg
blends
vulcanization
die
3. 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
copolymer
die
barrel
gauche conformation
4. Conformation in which the largest substituents are offset by 180
vinyl monomer
stabilizers
trans - conformation
most common condensation/step- growth polymerization occur between....
5. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
fillers
elastomers
petroleum
plasticizers
6. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
hopper
poly- p- phenylene benzobisoxazole PBO
relative molecular mass RMM
aramid
7. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
functionality
primary termination
acrylic
tow
8. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polyamides
configuration
conformation
blends
9. 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
any carbon with double bonds or repeated substituents
polyurethanes
aramid
mutual termination
10. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
thermoplastics
step- growth/condensation polymerization
atactic
11. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
petroleum
most common condensation/step- growth polymerization occur between....
trans - conformation
hopper
12. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density
solution spinning
initiation
side groups/ substituents
branching
13. Number of repeat/structural units in a polymer chain
alternating copolymers
degree of polymerization DPn
solution spinning
random copolymers
14. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
condensation/step- growth polymerization
petroleum
aramid
spinneret
15. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
copolymer
addition polymerization/chain growth/free- radical polymerization
relative molecular mass RMM
functionality
16. Carbon atom capable of multiple configurations due to four different substituents
asymetric
stabilizers
termination
solution spinning
17. Polymer made up of two of more differenet monomers covalently bonded together
homopolymer
conformation
end groups
copolymer
18. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
nylon
random copolymers
additives
conformation
19. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
isotactic dan
thermosets
freeze line
20. 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
number average molecular weight Mn
atactic
solution spinning
primary termination
21. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
initiation
gauche conformation
block copolymers
dyes
22. 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
thermoplastics
vulcanization
homopolymer
23. An acid and an alcohol
elastomers
tacticity
vulcanization
most common condensation/step- growth polymerization occur between....
24. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
nylon
polymers
block copolymers
atactic
25. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
mutual termination
any carbon with double bonds or repeated substituents
polymer backbone
plyacrylonitrile PAN
26. Low- molecular- weight building blocks repeated in the polymer chain
monomers
asymetric
copolymer
staggered conformation
27. Polymer that is made up a single repeat unit
plasticizers
homopolymer
copolymer
alternating copolymers
28. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
atactic
functionality
functional groups
injection molding
29. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
weight average molecular weight Mw
injection molding
polyurethanes
30. 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
rayon
most common condensation/step- growth polymerization occur between....
weight average molecular weight Mw
structural unit
31. 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
viscose process
alternating copolymers
oligomers
glass transition temperature Tg
32. Covalently bonded chains of molecules with small monomer units repeated from end to end
dyes
any carbon with double bonds or repeated substituents
poly- p- phenylene benzobisoxazole PBO
polymers
33. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
fillers
viscose process
conformation
cracking
34. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
weight average molecular weight Mw
polyesters
functional groups
secondary bonding
35. Primary raw material for most polymers
petroleum
aramid
asymetric
alternating copolymers
36. Is not asymetric and cannot have multiple configurations
poly- p- phenylene benzobisoxazole PBO
any carbon with double bonds or repeated substituents
die
block copolymers
37. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
aramid
coloring agents
elastomers
38. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polyviyl chloride PVC
die
shot size
polyurethanes
39. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
secondary bonding
any carbon with double bonds or repeated substituents
quenching
stabilizers
40. 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
isotactic dan
gauche conformation
number average molecular weight Mn
polymethylmethacrylate PMMA
41. 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
structural unit
polyesters
plyacrylonitrile PAN
relative molecular mass RMM
42. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
branching
poly- p- phenylene benzobisoxazole PBO
asymetric
43. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
plasticizers
random copolymers
quenching
hopper
44. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
homopolymer
tacticity
propagation
quenching
45. Atoms attached to the polymer backbone.
gauche conformation
side groups/ substituents
syndiotactic dyad
polyviyl chloride PVC
46. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
eclipsed conformation/ cis - conformation
polypphenylene terephyhalamide PPTA
solution spinning
thermosets
47. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
injection molding
blends
mutual termination
extruder
48. Simple polymeric material produced as pellets in large quantities
propagation
High volume thermoplastics HVTP
secondary bonding
thermoplastics
49. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
additives
plasticizers
oligomers
free radical
50. Relative configuration of adjecent asymmetric carbons
tacticity
initiation
plyacrylonitrile PAN
solution spinning