SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
number average molecular weight Mn
conformation
initiation
dyes
2. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
solution spinning
most common condensation/step- growth polymerization occur between....
branching
3. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
degree of polymerization DPn
termination
fillers
4. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
acrylic
polypphenylene terephyhalamide PPTA
copolymer
syndiotactic dyad
5. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
random copolymers
extruder
solution spinning
functionality
6. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
asymetric
quenching
solution spinning
polymer backbone
7. Is not asymetric and cannot have multiple configurations
stabilizers
shot size
any carbon with double bonds or repeated substituents
acrylic
8. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
poly- p- phenylene benzobisoxazole PBO
staggered conformation
elastomers
9. Number of bonds a molecule has formed
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
functionality
plyacrylonitrile PAN
10. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
stabilizers
spinneret
constitution
cracking
11. 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
tow
alternating copolymers
isotactic dan
plasticizers
12. Low- molecular- weight building blocks repeated in the polymer chain
plyacrylonitrile PAN
cracking
elastomers
monomers
13. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
constitution
extruder
vulcanization
vinyl monomer
14. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
poly- p- phenylene benzobisoxazole PBO
polymethylmethacrylate PMMA
polyviyl chloride PVC
High volume thermoplastics HVTP
15. Coloring agents that do not dissolve into the polymer
coloring agents
plyacrylonitrile PAN
primary bonding
pigments
16. Primary raw material for most polymers
degree of polymerization DPn
petroleum
copolymer
solution spinning
17. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
cracking
functional groups
blends
end groups
18. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
plasticizers
tacticity
barrel
19. 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
polyesters
branching
coloring agents
melt spinning
20. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
free radical
screen pack
termination
propagation
21. 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
free radical
elastomers
viscose process
polyesters
22. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
block copolymers
termination
condensation/step- growth polymerization
23. Additives whose primary purpose is to reduce the final cost of the product
propagation
aramid
termination
fillers
24. Two or more polymers mechanically mixed together but without covalent bonding between them
quenching
blends
elastomers
thermoplastics
25. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
end groups
elastomers
conformation
polymer backbone
26. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
termination
polymethylmethacrylate PMMA
cracking
27. Polymer that is made up a single repeat unit
homopolymer
eclipsed conformation/ cis - conformation
dyes
quenching
28. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
conformation
number average molecular weight Mn
aramid
29. Number of repeat/structural units in a polymer chain
plasticizers
isotactic dan
aramid
degree of polymerization DPn
30. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
hopper
polyesters
shot size
monomers
31. An acid and an alcohol
spinneret
most common condensation/step- growth polymerization occur between....
graft copolymers
viscose process
32. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
propagation
side groups/ substituents
poly- p- phenylene benzobisoxazole PBO
melt spinning
33. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polyurethanes
nylon
trans - conformation
eclipsed conformation/ cis - conformation
34. 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
weight average molecular weight Mw
functional groups
glass transition temperature Tg
35. Porcess of breaking large organic hydrocarbons into smaller molecules
primary bonding
cracking
structural unit
plyacrylonitrile PAN
36. 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
nylon
pigments
plyacrylonitrile PAN
condensation/step- growth polymerization
37. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
poly- p- phenylene benzobisoxazole PBO
additives
syndiotactic dyad
functionality
38. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
petroleum
branching
propagation
mutual termination
39. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
glass transition temperature Tg
nylon
polymethylmethacrylate PMMA
vulcanization
40. Relative configuration of adjecent asymmetric carbons
primary termination
functionality
spinneret
tacticity
41. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
barrel
primary bonding
end groups
condensation/step- growth polymerization
42. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
nylon
poly- p- phenylene benzobisoxazole PBO
screen pack
fillers
43. 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
viscose process
monomers
initiation
melt spinning
44. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
weight average molecular weight Mw
degree of polymerization DPn
dyes
45. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
melt spinning
plyacrylonitrile PAN
tow
side groups/ substituents
46. Arrangement of the largest substituents where the substituets are offset by 120
termination
staggered conformation
asymetric
polymethylmethacrylate PMMA
47. Covalent bonding of the polymer backbone and side groups
atactic
thermoplastics
alternating copolymers
primary bonding
48. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
configuration
homopolymer
step- growth/condensation polymerization
conformation
49. 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
polypphenylene terephyhalamide PPTA
trans - conformation
elastomers
50. Pigments or dyes that change the way light is absorbed or reflected by a polymer
alternating copolymers
coloring agents
condensation/step- growth polymerization
constitution