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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. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
petroleum
eclipsed conformation/ cis - conformation
vinyl monomer
fillers
2. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
nylon
asymetric
trans - conformation
3. 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
thermosets
polymer backbone
step- growth/condensation polymerization
functional groups
4. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
free radical
shot size
any carbon with double bonds or repeated substituents
polypphenylene terephyhalamide PPTA
5. Number of bonds a molecule has formed
hopper
asymetric
addition polymerization/chain growth/free- radical polymerization
functionality
6. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
relative molecular mass RMM
nylon
initiation
random copolymers
7. Relative configuration of adjecent asymmetric carbons
isotactic dan
tacticity
aramid
vinyl monomer
8. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
graft copolymers
addition polymerization/chain growth/free- radical polymerization
tow
thermosets
9. Coloring agents that do not dissolve into the polymer
plyacrylonitrile PAN
polypphenylene terephyhalamide PPTA
aramid
pigments
10. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
eclipsed conformation/ cis - conformation
die
conformation
glass transition temperature Tg
11. 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
barrel
cracking
plasticizers
shot size
12. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
secondary bonding
viscose process
trans - conformation
initiation
13. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
constitution
functionality
primary bonding
tow
14. First step in the process of polymerization - during which a free radical is formed
initiation
degree of polymerization DPn
copolymer
functional groups
15. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
number average molecular weight Mn
branching
elastomers
dyes
16. One type of polymer that contains at least 85% of polyacrylonitrile PAN
configuration
plasticizers
plasticizers
acrylic
17. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
condensation/step- growth polymerization
initiation
quenching
functional groups
18. 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
isotactic dan
structural unit
mutual termination
initiation
19. Simple polymeric material produced as pellets in large quantities
condensation/step- growth polymerization
vinyl monomer
petroleum
High volume thermoplastics HVTP
20. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
polymer backbone
hopper
plyacrylonitrile PAN
vulcanization
21. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
polyamides
conformation
alternating copolymers
22. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
screen pack
thermoplastics
relative molecular mass RMM
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
staggered conformation
freeze line
propagation
rayon
24. 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
thermosets
glass transition temperature Tg
injection molding
atactic
25. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
structural unit
thermoplastics
polyurethanes
polyesters
26. Covalently bonded chains of molecules with small monomer units repeated from end to end
tow
polymers
quenching
High volume thermoplastics HVTP
27. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
quenching
secondary bonding
alternating copolymers
eclipsed conformation/ cis - conformation
28. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
staggered conformation
functionality
addition polymerization/chain growth/free- radical polymerization
vulcanization
29. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
end groups
polymers
polyamides
configuration
30. Low- molecular- weight building blocks repeated in the polymer chain
vinyl monomer
monomers
copolymer
freeze line
31. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
glass transition temperature Tg
polyamides
coloring agents
rayon
32. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polymethylmethacrylate PMMA
polyamides
aramid
hopper
33. 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
alternating copolymers
barrel
melt spinning
glass transition temperature Tg
34. Pigments or dyes that change the way light is absorbed or reflected by a polymer
side groups/ substituents
petroleum
coloring agents
quenching
35. Arrangement of the largest substituents where the substituets are offset by 120
die
plyacrylonitrile PAN
staggered conformation
isotactic dan
36. 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
pigments
plasticizers
polypphenylene terephyhalamide PPTA
dyes
37. 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
trans - conformation
vinyl monomer
branching
polyesters
38. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
addition polymerization/chain growth/free- radical polymerization
alternating copolymers
dyes
melt spinning
39. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
trans - conformation
nylon
mutual termination
primary bonding
40. Is not asymetric and cannot have multiple configurations
solution spinning
gauche conformation
melt spinning
any carbon with double bonds or repeated substituents
41. 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
branching
shot size
die
petroleum
42. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
plyacrylonitrile PAN
polyviyl chloride PVC
elastomers
additives
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
tow
constitution
weight average molecular weight Mw
shot size
44. 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
thermoplastics
any carbon with double bonds or repeated substituents
polymethylmethacrylate PMMA
branching
45. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
freeze line
atactic
glass transition temperature Tg
46. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
solution spinning
spinneret
aramid
polyesters
47. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
configuration
primary bonding
shot size
vinyl monomer
48. Molecule containing a highly reactive unpaired electron
functional groups
constitution
free radical
polymer backbone
49. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
acrylic
isotactic dan
atactic
syndiotactic dyad
50. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
coloring agents
tacticity
isotactic dan
extruder