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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. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
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pigments
number average molecular weight Mn
2. Coloring agents that do not dissolve into the polymer
staggered conformation
pigments
glass transition temperature Tg
elastomers
3. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
asymetric
aramid
weight average molecular weight Mw
secondary bonding
4. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
polymers
graft copolymers
coloring agents
random copolymers
5. Conformation that occurs when the largest substituent in a molecule are offset by 60
vulcanization
poly- p- phenylene benzobisoxazole PBO
gauche conformation
alternating copolymers
6. Smallest repeating unit in a polymer. aka repeat unit
screen pack
number average molecular weight Mn
polymethylmethacrylate PMMA
structural unit
7. 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
alternating copolymers
spinneret
degree of polymerization DPn
weight average molecular weight Mw
8. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
melt spinning
alternating copolymers
plasticizers
functional groups
9. Additives whose primary purpose is to reduce the final cost of the product
polypphenylene terephyhalamide PPTA
fillers
polyesters
condensation/step- growth polymerization
10. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polyviyl chloride PVC
trans - conformation
configuration
functional groups
11. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
polypphenylene terephyhalamide PPTA
nylon
primary termination
thermoplastics
12. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
coloring agents
injection molding
addition polymerization/chain growth/free- radical polymerization
viscose process
13. 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
coloring agents
configuration
step- growth/condensation polymerization
petroleum
14. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
block copolymers
gauche conformation
spinneret
plasticizers
15. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
oligomers
extruder
melt spinning
functionality
16. Simple polymeric material produced as pellets in large quantities
functionality
thermosets
vinyl monomer
High volume thermoplastics HVTP
17. 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
tow
eclipsed conformation/ cis - conformation
vulcanization
glass transition temperature Tg
18. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
random copolymers
primary termination
blends
end groups
19. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
monomers
die
degree of polymerization DPn
secondary bonding
20. 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
homopolymer
conformation
polyesters
polymethylmethacrylate PMMA
21. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
termination
fillers
eclipsed conformation/ cis - conformation
22. 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
graft copolymers
extruder
polypphenylene terephyhalamide PPTA
solution spinning
23. 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
primary termination
block copolymers
additives
24. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
polymer backbone
polypphenylene terephyhalamide PPTA
any carbon with double bonds or repeated substituents
25. One type of polymer that contains at least 85% of polyacrylonitrile PAN
polypphenylene terephyhalamide PPTA
tow
acrylic
stabilizers
26. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
cracking
free radical
any carbon with double bonds or repeated substituents
27. 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
polymethylmethacrylate PMMA
hopper
block copolymers
aramid
28. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
weight average molecular weight Mw
dyes
polymethylmethacrylate PMMA
secondary bonding
29. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
relative molecular mass RMM
side groups/ substituents
step- growth/condensation polymerization
30. First step in the process of polymerization - during which a free radical is formed
initiation
plyacrylonitrile PAN
viscose process
quenching
31. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
cracking
branching
eclipsed conformation/ cis - conformation
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32. 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
alternating copolymers
vinyl monomer
barrel
side groups/ substituents
33. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
vinyl monomer
propagation
barrel
hopper
34. Low- molecular- weight building blocks repeated in the polymer chain
tow
constitution
tacticity
monomers
35. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
vinyl monomer
monomers
polymethylmethacrylate PMMA
side groups/ substituents
36. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
High volume thermoplastics HVTP
eclipsed conformation/ cis - conformation
secondary bonding
37. 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
addition polymerization/chain growth/free- radical polymerization
nylon
relative molecular mass RMM
asymetric
38. Polymers that contain amide (- N-) groups in the chain
aramid
polyamides
conformation
viscose process
39. 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
fillers
solution spinning
blends
number average molecular weight Mn
40. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
block copolymers
random copolymers
structural unit
41. Broad category of polymers that includes polymers containing urethane linkages
trans - conformation
polyurethanes
aramid
most common condensation/step- growth polymerization occur between....
42. Relative configuration of adjecent asymmetric carbons
barrel
trans - conformation
polypphenylene terephyhalamide PPTA
tacticity
43. An acid and an alcohol
asymetric
trans - conformation
most common condensation/step- growth polymerization occur between....
dyes
44. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
thermosets
barrel
polypphenylene terephyhalamide PPTA
functional groups
45. Is not asymetric and cannot have multiple configurations
acrylic
any carbon with double bonds or repeated substituents
side groups/ substituents
branching
46. Covalent bonding of the polymer backbone and side groups
petroleum
relative molecular mass RMM
primary bonding
rayon
47. 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
functionality
acrylic
condensation/step- growth polymerization
configuration
48. Pigments or dyes that change the way light is absorbed or reflected by a polymer
shot size
blends
side groups/ substituents
coloring agents
49. 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
vinyl monomer
pigments
die
degree of polymerization DPn
50. Double bounded organic molecule used to begin addition polymerization
copolymer
conformation
vinyl monomer
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