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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. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
thermosets
vulcanization
plyacrylonitrile PAN
number average molecular weight Mn
2. 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
thermosets
staggered conformation
solution spinning
plasticizers
3. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
stabilizers
tow
isotactic dan
additives
4. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
thermoplastics
side groups/ substituents
rayon
5. Low- molecular- weight building blocks repeated in the polymer chain
elastomers
propagation
monomers
coloring agents
6. Polymers that contain amide (- N-) groups in the chain
additives
polyamides
rayon
eclipsed conformation/ cis - conformation
7. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
graft copolymers
thermoplastics
polypphenylene terephyhalamide PPTA
vinyl monomer
8. Atoms attached to the polymer backbone.
constitution
polyurethanes
side groups/ substituents
copolymer
9. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
atactic
extruder
trans - conformation
10. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
coloring agents
polymer backbone
shot size
end groups
11. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
tow
polyesters
side groups/ substituents
nylon
12. Primary raw material for most polymers
step- growth/condensation polymerization
High volume thermoplastics HVTP
spinneret
petroleum
13. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
die
petroleum
coloring agents
14. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
melt spinning
number average molecular weight Mn
rayon
graft copolymers
15. Relative configuration of adjecent asymmetric carbons
spinneret
die
block copolymers
tacticity
16. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
isotactic dan
fillers
polyamides
17. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
die
graft copolymers
plyacrylonitrile PAN
pigments
18. Coloring agents that do not dissolve into the polymer
most common condensation/step- growth polymerization occur between....
pigments
spinneret
polyesters
19. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
isotactic dan
functionality
random copolymers
weight average molecular weight Mw
20. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
vulcanization
number average molecular weight Mn
polypphenylene terephyhalamide PPTA
condensation/step- growth polymerization
21. Double bounded organic molecule used to begin addition polymerization
polymethylmethacrylate PMMA
vinyl monomer
plasticizers
viscose process
22. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
asymetric
aramid
shot size
stabilizers
23. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
stabilizers
plasticizers
alternating copolymers
poly- p- phenylene benzobisoxazole PBO
24. 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
step- growth/condensation polymerization
degree of polymerization DPn
hopper
fillers
25. Conformation in which the largest substituents are offset by 180
configuration
elastomers
trans - conformation
rayon
26. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
glass transition temperature Tg
atactic
pigments
constitution
27. Polymer made up of two of more differenet monomers covalently bonded together
polyamides
extruder
gauche conformation
copolymer
28. An acid and an alcohol
polyviyl chloride PVC
mutual termination
thermosets
most common condensation/step- growth polymerization occur between....
29. Covalent bonding of the polymer backbone and side groups
High volume thermoplastics HVTP
aramid
copolymer
primary bonding
30. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
poly- p- phenylene benzobisoxazole PBO
quenching
acrylic
31. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polyamides
additives
polymethylmethacrylate PMMA
termination
32. Broad category of polymers that includes polymers containing urethane linkages
High volume thermoplastics HVTP
polyurethanes
pigments
free radical
33. 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
polyamides
stabilizers
number average molecular weight Mn
petroleum
34. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
freeze line
asymetric
stabilizers
secondary bonding
35. 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
atactic
condensation/step- growth polymerization
polyamides
branching
36. Smallest repeating unit in a polymer. aka repeat unit
structural unit
polypphenylene terephyhalamide PPTA
block copolymers
termination
37. Pigments or dyes that change the way light is absorbed or reflected by a polymer
number average molecular weight Mn
coloring agents
rayon
hopper
38. Number of bonds a molecule has formed
hopper
petroleum
functionality
stabilizers
39. First step in the process of polymerization - during which a free radical is formed
number average molecular weight Mn
termination
freeze line
initiation
40. Porcess of breaking large organic hydrocarbons into smaller molecules
plyacrylonitrile PAN
melt spinning
cracking
random copolymers
41. Number of repeat/structural units in a polymer chain
relative molecular mass RMM
random copolymers
degree of polymerization DPn
tow
42. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
copolymer
blends
dyes
end groups
43. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
solution spinning
stabilizers
gauche conformation
vinyl monomer
44. 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
spinneret
glass transition temperature Tg
vinyl monomer
end groups
45. Polymer that is made up a single repeat unit
homopolymer
dyes
tow
degree of polymerization DPn
46. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
fillers
conformation
oligomers
isotactic dan
47. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
graft copolymers
additives
primary bonding
injection molding
48. 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
polyviyl chloride PVC
injection molding
melt spinning
homopolymer
49. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
eclipsed conformation/ cis - conformation
plasticizers
functionality
50. 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
constitution
free radical
block copolymers
degree of polymerization DPn