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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. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
glass transition temperature Tg
poly- p- phenylene benzobisoxazole PBO
monomers
tow
2. 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
solution spinning
block copolymers
mutual termination
step- growth/condensation polymerization
3. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
polymers
nylon
elastomers
4. Pigments or dyes that change the way light is absorbed or reflected by a polymer
any carbon with double bonds or repeated substituents
coloring agents
blends
oligomers
5. 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
glass transition temperature Tg
trans - conformation
melt spinning
freeze line
6. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
solution spinning
plyacrylonitrile PAN
secondary bonding
pigments
7. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
extruder
polyesters
plyacrylonitrile PAN
polymethylmethacrylate PMMA
8. Conformation in which the largest substituents are offset by 180
additives
plasticizers
trans - conformation
solution spinning
9. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
syndiotactic dyad
shot size
stabilizers
10. 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
aramid
hopper
step- growth/condensation polymerization
11. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
shot size
number average molecular weight Mn
dyes
thermosets
12. Polymers that contain amide (- N-) groups in the chain
syndiotactic dyad
barrel
polyamides
rayon
13. 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
solution spinning
plasticizers
polymethylmethacrylate PMMA
glass transition temperature Tg
14. 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
melt spinning
primary termination
secondary bonding
15. Carbon atom capable of multiple configurations due to four different substituents
functionality
petroleum
vinyl monomer
asymetric
16. Coloring agents that do not dissolve into the polymer
viscose process
nylon
solution spinning
pigments
17. Is not asymetric and cannot have multiple configurations
addition polymerization/chain growth/free- radical polymerization
conformation
rayon
any carbon with double bonds or repeated substituents
18. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
isotactic dan
viscose process
extruder
acrylic
19. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
plasticizers
extruder
end groups
20. 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
polypphenylene terephyhalamide PPTA
polymethylmethacrylate PMMA
viscose process
21. 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
primary termination
die
functionality
staggered conformation
22. Conformation that occurs when the largest substituent in a molecule are offset by 60
termination
random copolymers
gauche conformation
thermoplastics
23. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
alternating copolymers
pigments
constitution
graft copolymers
24. Number of bonds a molecule has formed
polymethylmethacrylate PMMA
functionality
copolymer
shot size
25. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
polyamides
functional groups
atactic
polymer backbone
26. Atoms attached to the polymer backbone.
tow
polyesters
side groups/ substituents
secondary bonding
27. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
elastomers
spinneret
oligomers
melt spinning
28. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
oligomers
barrel
plyacrylonitrile PAN
29. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
poly- p- phenylene benzobisoxazole PBO
eclipsed conformation/ cis - conformation
hopper
quenching
30. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
stabilizers
dyes
staggered conformation
31. Polymer made up of two of more differenet monomers covalently bonded together
mutual termination
copolymer
viscose process
acrylic
32. Broad category of polymers that includes polymers containing urethane linkages
addition polymerization/chain growth/free- radical polymerization
polyurethanes
mutual termination
solution spinning
33. Polymer that is made up a single repeat unit
primary termination
melt spinning
condensation/step- growth polymerization
homopolymer
34. 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
configuration
fillers
copolymer
solution spinning
35. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
stabilizers
aramid
side groups/ substituents
thermoplastics
36. 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
weight average molecular weight Mw
elastomers
degree of polymerization DPn
37. Relative configuration of adjecent asymmetric carbons
tacticity
polyurethanes
propagation
mutual termination
38. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
addition polymerization/chain growth/free- radical polymerization
condensation/step- growth polymerization
block copolymers
39. Smallest repeating unit in a polymer. aka repeat unit
structural unit
High volume thermoplastics HVTP
oligomers
trans - conformation
40. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
injection molding
polyurethanes
alternating copolymers
41. Primary raw material for most polymers
hopper
poly- p- phenylene benzobisoxazole PBO
petroleum
additives
42. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
trans - conformation
oligomers
additives
copolymer
43. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
glass transition temperature Tg
secondary bonding
plyacrylonitrile PAN
44. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
polymers
rayon
most common condensation/step- growth polymerization occur between....
end groups
45. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
termination
additives
step- growth/condensation polymerization
constitution
46. 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
conformation
nylon
hopper
branching
47. Double bounded organic molecule used to begin addition polymerization
shot size
vinyl monomer
polyviyl chloride PVC
elastomers
48. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
dyes
poly- p- phenylene benzobisoxazole PBO
shot size
blends
49. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
primary bonding
aramid
High volume thermoplastics HVTP
relative molecular mass RMM
50. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
graft copolymers
polymethylmethacrylate PMMA
homopolymer