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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. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
vinyl monomer
elastomers
poly- p- phenylene benzobisoxazole PBO
eclipsed conformation/ cis - conformation
2. Arrangement of the largest substituents where the substituets are offset by 120
blends
quenching
number average molecular weight Mn
staggered conformation
3. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
propagation
block copolymers
thermosets
solution spinning
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
freeze line
acrylic
polymer backbone
screen pack
5. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
configuration
polymers
staggered conformation
6. Molecule containing a highly reactive unpaired electron
polypphenylene terephyhalamide PPTA
coloring agents
free radical
die
7. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polymethylmethacrylate PMMA
atactic
primary termination
secondary bonding
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
alternating copolymers
relative molecular mass RMM
degree of polymerization DPn
dyes
9. Conformation in which the largest substituents are offset by 180
trans - conformation
glass transition temperature Tg
mutual termination
tow
10. Primary raw material for most polymers
plasticizers
petroleum
aramid
blends
11. Polymer made up of two of more differenet monomers covalently bonded together
branching
copolymer
plyacrylonitrile PAN
polymer backbone
12. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
vinyl monomer
termination
weight average molecular weight Mw
13. 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
branching
nylon
initiation
condensation/step- growth polymerization
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
High volume thermoplastics HVTP
polymethylmethacrylate PMMA
step- growth/condensation polymerization
plasticizers
15. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
condensation/step- growth polymerization
plasticizers
termination
relative molecular mass RMM
16. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
number average molecular weight Mn
polypphenylene terephyhalamide PPTA
viscose process
17. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
pigments
nylon
constitution
polyviyl chloride PVC
18. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
nylon
elastomers
mutual termination
19. Additives whose primary purpose is to reduce the final cost of the product
constitution
melt spinning
plyacrylonitrile PAN
fillers
20. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
primary bonding
initiation
quenching
21. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
glass transition temperature Tg
viscose process
oligomers
22. 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
glass transition temperature Tg
vinyl monomer
extruder
additives
23. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
polymers
shot size
freeze line
24. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
acrylic
plyacrylonitrile PAN
polymers
configuration
25. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
staggered conformation
rayon
tow
number average molecular weight Mn
26. 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
die
conformation
stabilizers
vulcanization
27. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
step- growth/condensation polymerization
polymethylmethacrylate PMMA
cracking
28. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
barrel
asymetric
additives
atactic
29. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
end groups
number average molecular weight Mn
copolymer
30. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
polymethylmethacrylate PMMA
coloring agents
injection molding
constitution
31. 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
thermosets
side groups/ substituents
isotactic dan
polypphenylene terephyhalamide PPTA
32. 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
atactic
solution spinning
die
mutual termination
33. Covalent bonding of the polymer backbone and side groups
vulcanization
addition polymerization/chain growth/free- radical polymerization
primary bonding
melt spinning
34. 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
viscose process
thermosets
syndiotactic dyad
mutual termination
35. 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
solution spinning
side groups/ substituents
block copolymers
poly- p- phenylene benzobisoxazole PBO
36. Carbon atom capable of multiple configurations due to four different substituents
most common condensation/step- growth polymerization occur between....
asymetric
polyesters
degree of polymerization DPn
37. Coloring agents that do not dissolve into the polymer
block copolymers
vinyl monomer
pigments
solution spinning
38. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
primary termination
coloring agents
additives
39. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
number average molecular weight Mn
secondary bonding
blends
High volume thermoplastics HVTP
40. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
vinyl monomer
melt spinning
hopper
primary termination
41. Is not asymetric and cannot have multiple configurations
hopper
plyacrylonitrile PAN
additives
any carbon with double bonds or repeated substituents
42. 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
isotactic dan
dyes
quenching
plasticizers
43. Low- molecular- weight building blocks repeated in the polymer chain
end groups
monomers
freeze line
eclipsed conformation/ cis - conformation
44. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
additives
thermoplastics
constitution
propagation
45. Number of bonds a molecule has formed
dyes
functionality
viscose process
any carbon with double bonds or repeated substituents
46. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
die
tow
spinneret
configuration
47. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
pigments
alternating copolymers
addition polymerization/chain growth/free- radical polymerization
number average molecular weight Mn
48. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polymers
eclipsed conformation/ cis - conformation
freeze line
constitution
49. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
spinneret
polyesters
tow
50. 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
petroleum
melt spinning
branching
additives