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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. Carbon atom capable of multiple configurations due to four different substituents
functional groups
polymer backbone
asymetric
polymethylmethacrylate PMMA
2. Coloring agents that do not dissolve into the polymer
constitution
staggered conformation
pigments
petroleum
3. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
vulcanization
syndiotactic dyad
polyesters
4. Low- molecular- weight building blocks repeated in the polymer chain
monomers
hopper
copolymer
screen pack
5. 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
weight average molecular weight Mw
barrel
monomers
High volume thermoplastics HVTP
6. Broad category of polymers that includes polymers containing urethane linkages
injection molding
polyurethanes
dyes
blends
7. 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
polymer backbone
plasticizers
hopper
elastomers
8. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
gauche conformation
trans - conformation
constitution
blends
9. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
polyesters
condensation/step- growth polymerization
viscose process
10. Smallest repeating unit in a polymer. aka repeat unit
initiation
weight average molecular weight Mw
structural unit
staggered conformation
11. Covalent bonding of the polymer backbone and side groups
primary bonding
tow
viscose process
melt spinning
12. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
secondary bonding
polyviyl chloride PVC
polymethylmethacrylate PMMA
block copolymers
13. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
glass transition temperature Tg
hopper
propagation
termination
14. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
primary termination
conformation
weight average molecular weight Mw
15. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
propagation
random copolymers
solution spinning
eclipsed conformation/ cis - conformation
16. Primary raw material for most polymers
functional groups
polyurethanes
petroleum
syndiotactic dyad
17. Pigments or dyes that change the way light is absorbed or reflected by a polymer
extruder
coloring agents
number average molecular weight Mn
polypphenylene terephyhalamide PPTA
18. Atoms attached to the polymer backbone.
trans - conformation
thermoplastics
polypphenylene terephyhalamide PPTA
side groups/ substituents
19. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
graft copolymers
coloring agents
polymers
20. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
staggered conformation
spinneret
plasticizers
polyurethanes
21. 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
polypphenylene terephyhalamide PPTA
polyesters
solution spinning
trans - conformation
22. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
syndiotactic dyad
additives
blends
glass transition temperature Tg
23. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
end groups
mutual termination
plasticizers
oligomers
24. Polymers that contain amide (- N-) groups in the chain
solution spinning
structural unit
polyamides
gauche conformation
25. Relative configuration of adjecent asymmetric carbons
vulcanization
graft copolymers
any carbon with double bonds or repeated substituents
tacticity
26. Is not asymetric and cannot have multiple configurations
syndiotactic dyad
mutual termination
polymethylmethacrylate PMMA
any carbon with double bonds or repeated substituents
27. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
stabilizers
plyacrylonitrile PAN
random copolymers
polypphenylene terephyhalamide PPTA
28. 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
side groups/ substituents
dyes
melt spinning
acrylic
29. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
random copolymers
spinneret
polypphenylene terephyhalamide PPTA
conformation
30. Covalently bonded chains of molecules with small monomer units repeated from end to end
branching
poly- p- phenylene benzobisoxazole PBO
hopper
polymers
31. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
trans - conformation
spinneret
degree of polymerization DPn
32. Polymer made up of two of more differenet monomers covalently bonded together
functional groups
freeze line
constitution
copolymer
33. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
barrel
secondary bonding
rayon
die
34. 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
functional groups
branching
secondary bonding
35. 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
thermosets
polyamides
any carbon with double bonds or repeated substituents
die
36. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
any carbon with double bonds or repeated substituents
injection molding
poly- p- phenylene benzobisoxazole PBO
37. Number of bonds a molecule has formed
homopolymer
functionality
elastomers
staggered conformation
38. 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
block copolymers
polyurethanes
asymetric
propagation
39. 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
end groups
condensation/step- growth polymerization
quenching
polyurethanes
40. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
plasticizers
termination
functional groups
poly- p- phenylene benzobisoxazole PBO
41. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
most common condensation/step- growth polymerization occur between....
nylon
atactic
freeze line
42. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
staggered conformation
acrylic
viscose process
primary termination
43. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
oligomers
tow
constitution
44. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
coloring agents
graft copolymers
elastomers
freeze line
45. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
block copolymers
side groups/ substituents
termination
graft copolymers
46. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
termination
screen pack
propagation
47. 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
atactic
barrel
end groups
glass transition temperature Tg
48. 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
configuration
polyamides
isotactic dan
primary bonding
49. 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
configuration
trans - conformation
copolymer
50. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
shot size
nylon
injection molding