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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 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
functionality
polyurethanes
mutual termination
atactic
2. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
constitution
petroleum
nylon
isotactic dan
3. Coloring agents that do not dissolve into the polymer
block copolymers
staggered conformation
pigments
free radical
4. 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
number average molecular weight Mn
barrel
staggered conformation
viscose process
5. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
stabilizers
polyamides
oligomers
hopper
6. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
polypphenylene terephyhalamide PPTA
rayon
pigments
side groups/ substituents
7. Pigments or dyes that change the way light is absorbed or reflected by a polymer
tacticity
coloring agents
solution spinning
blends
8. 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
graft copolymers
polymers
termination
9. Porcess of breaking large organic hydrocarbons into smaller molecules
High volume thermoplastics HVTP
weight average molecular weight Mw
acrylic
cracking
10. 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
constitution
stabilizers
plasticizers
die
11. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
aramid
most common condensation/step- growth polymerization occur between....
staggered conformation
12. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
tacticity
end groups
most common condensation/step- growth polymerization occur between....
13. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
plyacrylonitrile PAN
plasticizers
secondary bonding
injection molding
14. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
screen pack
cracking
primary termination
solution spinning
15. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
plasticizers
step- growth/condensation polymerization
eclipsed conformation/ cis - conformation
16. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
plyacrylonitrile PAN
staggered conformation
polymers
17. Is not asymetric and cannot have multiple configurations
monomers
asymetric
weight average molecular weight Mw
any carbon with double bonds or repeated substituents
18. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
plasticizers
tow
alternating copolymers
degree of polymerization DPn
19. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
poly- p- phenylene benzobisoxazole PBO
dyes
polymethylmethacrylate PMMA
primary termination
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
solution spinning
step- growth/condensation polymerization
weight average molecular weight Mw
nylon
21. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
random copolymers
viscose process
block copolymers
branching
22. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
rayon
poly- p- phenylene benzobisoxazole PBO
polymers
random copolymers
23. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
isotactic dan
branching
staggered conformation
24. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
shot size
asymetric
polymethylmethacrylate PMMA
polyamides
25. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
petroleum
alternating copolymers
trans - conformation
polymer backbone
26. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
end groups
asymetric
conformation
27. Number of bonds a molecule has formed
relative molecular mass RMM
primary bonding
functionality
vinyl monomer
28. Primary raw material for most polymers
end groups
configuration
petroleum
polyesters
29. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
functionality
syndiotactic dyad
polyesters
30. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
blends
polyviyl chloride PVC
step- growth/condensation polymerization
termination
31. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
any carbon with double bonds or repeated substituents
alternating copolymers
polymers
spinneret
32. 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
extruder
solution spinning
asymetric
melt spinning
33. Covalently bonded chains of molecules with small monomer units repeated from end to end
coloring agents
polymers
screen pack
solution spinning
34. 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
step- growth/condensation polymerization
propagation
copolymer
fillers
35. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
configuration
shot size
polymers
branching
36. Polymer made up of two of more differenet monomers covalently bonded together
monomers
copolymer
atactic
side groups/ substituents
37. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
additives
polypphenylene terephyhalamide PPTA
branching
freeze line
38. 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
atactic
isotactic dan
elastomers
polymer backbone
39. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
solution spinning
functional groups
coloring agents
configuration
40. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
number average molecular weight Mn
side groups/ substituents
vinyl monomer
secondary bonding
41. Relative configuration of adjecent asymmetric carbons
tacticity
petroleum
injection molding
polymers
42. Molecule containing a highly reactive unpaired electron
free radical
structural unit
homopolymer
most common condensation/step- growth polymerization occur between....
43. Low- molecular- weight building blocks repeated in the polymer chain
monomers
degree of polymerization DPn
secondary bonding
hopper
44. An acid and an alcohol
polyamides
gauche conformation
most common condensation/step- growth polymerization occur between....
screen pack
45. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
oligomers
quenching
functionality
aramid
46. Softening agents
aramid
melt spinning
asymetric
plasticizers
47. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
quenching
functional groups
trans - conformation
hopper
48. One type of polymer that contains at least 85% of polyacrylonitrile PAN
dyes
free radical
quenching
acrylic
49. 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
High volume thermoplastics HVTP
branching
block copolymers
fillers
50. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
structural unit
plyacrylonitrile PAN
polymers
free radical