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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
extruder
elastomers
mutual termination
2. Polymer made up of two of more differenet monomers covalently bonded together
melt spinning
copolymer
nylon
plyacrylonitrile PAN
3. Low- molecular- weight building blocks repeated in the polymer chain
monomers
melt spinning
polypphenylene terephyhalamide PPTA
polymer backbone
4. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
number average molecular weight Mn
freeze line
trans - conformation
polymer backbone
5. 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
eclipsed conformation/ cis - conformation
polyesters
die
homopolymer
6. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
any carbon with double bonds or repeated substituents
extruder
conformation
plyacrylonitrile PAN
7. 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
addition polymerization/chain growth/free- radical polymerization
atactic
rayon
glass transition temperature Tg
8. 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
relative molecular mass RMM
number average molecular weight Mn
polymer backbone
functional groups
9. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
additives
random copolymers
side groups/ substituents
acrylic
10. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
branching
solution spinning
coloring agents
11. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
mutual termination
aramid
thermosets
12. Double bounded organic molecule used to begin addition polymerization
nylon
spinneret
oligomers
vinyl monomer
13. 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
branching
thermosets
die
14. Pigments or dyes that change the way light is absorbed or reflected by a polymer
addition polymerization/chain growth/free- radical polymerization
gauche conformation
rayon
coloring agents
15. 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
shot size
polypphenylene terephyhalamide PPTA
step- growth/condensation polymerization
tacticity
16. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
nylon
stabilizers
elastomers
acrylic
17. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
side groups/ substituents
quenching
tow
gauche conformation
18. 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
elastomers
functionality
isotactic dan
die
19. Molecule containing a highly reactive unpaired electron
most common condensation/step- growth polymerization occur between....
polyamides
petroleum
free radical
20. An acid and an alcohol
shot size
block copolymers
most common condensation/step- growth polymerization occur between....
additives
21. Primary raw material for most polymers
injection molding
petroleum
number average molecular weight Mn
cracking
22. Softening agents
polymer backbone
termination
syndiotactic dyad
plasticizers
23. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
alternating copolymers
functional groups
polymer backbone
polymers
24. 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
branching
plasticizers
polyamides
solution spinning
25. 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
weight average molecular weight Mw
functionality
end groups
melt spinning
26. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
primary bonding
cracking
plyacrylonitrile PAN
polypphenylene terephyhalamide PPTA
27. 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
stabilizers
barrel
primary termination
28. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
quenching
High volume thermoplastics HVTP
functional groups
29. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
any carbon with double bonds or repeated substituents
plasticizers
spinneret
dyes
30. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
primary bonding
tow
configuration
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
spinneret
screen pack
blends
solution spinning
32. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
eclipsed conformation/ cis - conformation
trans - conformation
melt spinning
oligomers
33. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
stabilizers
end groups
staggered conformation
polymers
34. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
termination
plasticizers
thermosets
extruder
35. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
plyacrylonitrile PAN
thermosets
shot size
copolymer
36. Additives whose primary purpose is to reduce the final cost of the product
polymethylmethacrylate PMMA
freeze line
injection molding
fillers
37. Is not asymetric and cannot have multiple configurations
poly- p- phenylene benzobisoxazole PBO
copolymer
plasticizers
any carbon with double bonds or repeated substituents
38. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
tow
alternating copolymers
fillers
39. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
monomers
gauche conformation
shot size
graft copolymers
40. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
polymer backbone
dyes
extruder
41. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
coloring agents
secondary bonding
glass transition temperature Tg
plasticizers
42. Atoms attached to the polymer backbone.
polymethylmethacrylate PMMA
additives
blends
side groups/ substituents
43. 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
trans - conformation
copolymer
oligomers
branching
44. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
functionality
polymethylmethacrylate PMMA
nylon
45. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
asymetric
blends
viscose process
quenching
46. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
extruder
nylon
constitution
monomers
47. Conformation in which the largest substituents are offset by 180
spinneret
constitution
trans - conformation
isotactic dan
48. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
configuration
polyesters
alternating copolymers
atactic
49. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
extruder
fillers
additives
primary termination
50. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
plasticizers
syndiotactic dyad
injection molding
graft copolymers