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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
polyamides
petroleum
polyviyl chloride PVC
random copolymers
2. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight
barrel
relative molecular mass RMM
end groups
oligomers
3. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
quenching
elastomers
most common condensation/step- growth polymerization occur between....
relative molecular mass RMM
4. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
degree of polymerization DPn
homopolymer
vinyl monomer
constitution
5. Number of repeat/structural units in a polymer chain
vinyl monomer
polyamides
nylon
degree of polymerization DPn
6. Pigments or dyes that change the way light is absorbed or reflected by a polymer
propagation
polyviyl chloride PVC
extruder
coloring agents
7. Conformation that occurs when the largest substituent in a molecule are offset by 60
quenching
conformation
gauche conformation
cracking
8. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
relative molecular mass RMM
polymers
syndiotactic dyad
constitution
9. 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
copolymer
random copolymers
vinyl monomer
10. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
quenching
side groups/ substituents
polypphenylene terephyhalamide PPTA
11. Conformation in which the largest substituents are offset by 180
random copolymers
trans - conformation
plasticizers
tacticity
12. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polyesters
additives
addition polymerization/chain growth/free- radical polymerization
conformation
13. One type of polymer that contains at least 85% of polyacrylonitrile PAN
plasticizers
acrylic
primary termination
tacticity
14. 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
functional groups
condensation/step- growth polymerization
plasticizers
step- growth/condensation polymerization
15. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
primary bonding
syndiotactic dyad
tow
configuration
16. Polymers that contain amide (- N-) groups in the chain
stabilizers
polyamides
atactic
weight average molecular weight Mw
17. Atoms attached to the polymer backbone.
fillers
propagation
petroleum
side groups/ substituents
18. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
any carbon with double bonds or repeated substituents
copolymer
fillers
vulcanization
19. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
number average molecular weight Mn
shot size
mutual termination
condensation/step- growth polymerization
20. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
rayon
secondary bonding
shot size
monomers
21. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
vinyl monomer
syndiotactic dyad
alternating copolymers
22. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
shot size
plasticizers
thermosets
isotactic dan
23. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
screen pack
spinneret
die
termination
24. Relative configuration of adjecent asymmetric carbons
tacticity
alternating copolymers
polyviyl chloride PVC
thermoplastics
25. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
polyurethanes
most common condensation/step- growth polymerization occur between....
primary termination
atactic
26. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
thermoplastics
spinneret
acrylic
copolymer
27. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
termination
polymers
functional groups
eclipsed conformation/ cis - conformation
28. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
staggered conformation
injection molding
polymer backbone
melt spinning
29. 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
barrel
step- growth/condensation polymerization
copolymer
number average molecular weight Mn
30. 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
functionality
stabilizers
glass transition temperature Tg
block copolymers
31. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polyviyl chloride PVC
atactic
solution spinning
additives
32. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
elastomers
barrel
aramid
freeze line
33. Additives whose primary purpose is to reduce the final cost of the product
syndiotactic dyad
fillers
petroleum
hopper
34. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
cracking
extruder
plyacrylonitrile PAN
asymetric
35. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
plyacrylonitrile PAN
eclipsed conformation/ cis - conformation
nylon
branching
36. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
primary termination
staggered conformation
viscose process
alternating copolymers
37. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
spinneret
step- growth/condensation polymerization
plyacrylonitrile PAN
mutual termination
38. Simple polymeric material produced as pellets in large quantities
thermoplastics
High volume thermoplastics HVTP
branching
petroleum
39. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
isotactic dan
blends
elastomers
40. 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
most common condensation/step- growth polymerization occur between....
shot size
number average molecular weight Mn
thermosets
41. Broad category of polymers that includes polymers containing urethane linkages
isotactic dan
condensation/step- growth polymerization
polyurethanes
structural unit
42. Porcess of breaking large organic hydrocarbons into smaller molecules
copolymer
rayon
cracking
isotactic dan
43. Smallest repeating unit in a polymer. aka repeat unit
vulcanization
any carbon with double bonds or repeated substituents
most common condensation/step- growth polymerization occur between....
structural unit
44. 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
poly- p- phenylene benzobisoxazole PBO
most common condensation/step- growth polymerization occur between....
step- growth/condensation polymerization
condensation/step- growth polymerization
45. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
shot size
dyes
monomers
functionality
46. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
plyacrylonitrile PAN
polyviyl chloride PVC
hopper
polymers
47. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
solution spinning
oligomers
random copolymers
elastomers
48. 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
polyesters
quenching
thermosets
polymer backbone
49. Polymer that is made up a single repeat unit
fillers
free radical
homopolymer
termination
50. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
relative molecular mass RMM
pigments
homopolymer
screen pack