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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. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
cracking
configuration
elastomers
dyes
2. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
syndiotactic dyad
any carbon with double bonds or repeated substituents
addition polymerization/chain growth/free- radical polymerization
3. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
weight average molecular weight Mw
thermosets
graft copolymers
4. An acid and an alcohol
termination
tacticity
thermoplastics
most common condensation/step- growth polymerization occur between....
5. Number of bonds a molecule has formed
High volume thermoplastics HVTP
functionality
propagation
initiation
6. 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
melt spinning
tow
block copolymers
polyesters
7. Low- molecular- weight building blocks repeated in the polymer chain
side groups/ substituents
monomers
alternating copolymers
plyacrylonitrile PAN
8. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
monomers
conformation
end groups
gauche conformation
9. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
eclipsed conformation/ cis - conformation
step- growth/condensation polymerization
injection molding
structural unit
10. 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
solution spinning
fillers
isotactic dan
vulcanization
11. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
atactic
initiation
polyamides
12. 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
extruder
polyesters
atactic
spinneret
13. 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
melt spinning
staggered conformation
elastomers
asymetric
14. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
elastomers
condensation/step- growth polymerization
syndiotactic dyad
graft copolymers
15. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
random copolymers
functional groups
secondary bonding
mutual termination
16. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
block copolymers
primary termination
relative molecular mass RMM
17. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
fillers
cracking
polymethylmethacrylate PMMA
18. 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
relative molecular mass RMM
polyviyl chloride PVC
branching
structural unit
19. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
any carbon with double bonds or repeated substituents
weight average molecular weight Mw
alternating copolymers
20. Additives whose primary purpose is to reduce the final cost of the product
addition polymerization/chain growth/free- radical polymerization
functionality
fillers
condensation/step- growth polymerization
21. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
functional groups
tacticity
screen pack
22. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
eclipsed conformation/ cis - conformation
High volume thermoplastics HVTP
degree of polymerization DPn
23. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
conformation
freeze line
mutual termination
addition polymerization/chain growth/free- radical polymerization
24. 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
quenching
propagation
polyurethanes
barrel
25. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
cracking
functional groups
number average molecular weight Mn
26. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
injection molding
elastomers
termination
barrel
27. Is not asymetric and cannot have multiple configurations
primary termination
any carbon with double bonds or repeated substituents
addition polymerization/chain growth/free- radical polymerization
end groups
28. Polymer that is made up a single repeat unit
tow
spinneret
step- growth/condensation polymerization
homopolymer
29. Simple polymeric material produced as pellets in large quantities
hopper
spinneret
polymethylmethacrylate PMMA
High volume thermoplastics HVTP
30. Smallest repeating unit in a polymer. aka repeat unit
eclipsed conformation/ cis - conformation
degree of polymerization DPn
structural unit
termination
31. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
vulcanization
initiation
blends
32. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
copolymer
polymer backbone
petroleum
33. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
coloring agents
thermoplastics
vulcanization
34. 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
stabilizers
extruder
elastomers
relative molecular mass RMM
35. First step in the process of polymerization - during which a free radical is formed
homopolymer
initiation
die
fillers
36. Polymer made up of two of more differenet monomers covalently bonded together
any carbon with double bonds or repeated substituents
cracking
copolymer
petroleum
37. Relative configuration of adjecent asymmetric carbons
secondary bonding
aramid
tacticity
shot size
38. Carbon atom capable of multiple configurations due to four different substituents
extruder
spinneret
tacticity
asymetric
39. Conformation that occurs when the largest substituent in a molecule are offset by 60
configuration
constitution
gauche conformation
rayon
40. Covalent bonding of the polymer backbone and side groups
High volume thermoplastics HVTP
fillers
primary bonding
polypphenylene terephyhalamide PPTA
41. Covalently bonded chains of molecules with small monomer units repeated from end to end
polyviyl chloride PVC
gauche conformation
polymers
addition polymerization/chain growth/free- radical polymerization
42. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
trans - conformation
vinyl monomer
primary bonding
43. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior
weight average molecular weight Mw
plyacrylonitrile PAN
nylon
polyesters
44. Atoms attached to the polymer backbone.
graft copolymers
trans - conformation
eclipsed conformation/ cis - conformation
side groups/ substituents
45. 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
homopolymer
alternating copolymers
condensation/step- growth polymerization
dyes
46. 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
copolymer
glass transition temperature Tg
polyurethanes
viscose process
47. Broad category of polymers that includes polymers containing urethane linkages
stabilizers
propagation
polyurethanes
quenching
48. 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
shot size
gauche conformation
initiation
plasticizers
49. Molecule containing a highly reactive unpaired electron
relative molecular mass RMM
High volume thermoplastics HVTP
free radical
configuration
50. Primary raw material for most polymers
petroleum
graft copolymers
thermoplastics
syndiotactic dyad