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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. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
fillers
conformation
random copolymers
any carbon with double bonds or repeated substituents
2. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
any carbon with double bonds or repeated substituents
eclipsed conformation/ cis - conformation
polymer backbone
atactic
3. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
tow
hopper
number average molecular weight Mn
polymers
4. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
shot size
coloring agents
constitution
freeze line
5. Porcess of breaking large organic hydrocarbons into smaller molecules
initiation
oligomers
functional groups
cracking
6. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
weight average molecular weight Mw
termination
hopper
end groups
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
structural unit
plyacrylonitrile PAN
petroleum
thermoplastics
8. Primary raw material for most polymers
petroleum
solution spinning
tacticity
vulcanization
9. Polymer made up of two of more differenet monomers covalently bonded together
polymers
free radical
copolymer
syndiotactic dyad
10. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
conformation
number average molecular weight Mn
plasticizers
quenching
11. Conformation that occurs when the largest substituent in a molecule are offset by 60
functional groups
gauche conformation
plyacrylonitrile PAN
polyurethanes
12. Conformation in which the largest substituents are offset by 180
vulcanization
trans - conformation
weight average molecular weight Mw
petroleum
13. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
side groups/ substituents
secondary bonding
polypphenylene terephyhalamide PPTA
staggered conformation
14. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
secondary bonding
step- growth/condensation polymerization
termination
cracking
15. 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
High volume thermoplastics HVTP
die
step- growth/condensation polymerization
melt spinning
16. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
viscose process
primary termination
random copolymers
vulcanization
17. Atoms attached to the polymer backbone.
side groups/ substituents
oligomers
functional groups
dyes
18. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
petroleum
homopolymer
tacticity
elastomers
19. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
spinneret
monomers
polyviyl chloride PVC
plasticizers
20. Low- molecular- weight building blocks repeated in the polymer chain
fillers
side groups/ substituents
monomers
acrylic
21. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
freeze line
addition polymerization/chain growth/free- radical polymerization
eclipsed conformation/ cis - conformation
primary bonding
22. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
functionality
polyesters
viscose process
branching
23. 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
branching
polymers
condensation/step- growth polymerization
homopolymer
24. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
extruder
relative molecular mass RMM
vulcanization
25. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
nylon
copolymer
viscose process
26. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
rayon
freeze line
elastomers
nylon
27. Polymer that is made up a single repeat unit
barrel
homopolymer
configuration
plasticizers
28. 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
blends
constitution
nylon
29. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
hopper
polymethylmethacrylate PMMA
cracking
trans - conformation
30. 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
stabilizers
thermoplastics
polyurethanes
31. 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
glass transition temperature Tg
High volume thermoplastics HVTP
conformation
branching
32. Additives whose primary purpose is to reduce the final cost of the product
polymers
alternating copolymers
fillers
most common condensation/step- growth polymerization occur between....
33. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
conformation
plyacrylonitrile PAN
alternating copolymers
hopper
34. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
syndiotactic dyad
primary termination
atactic
relative molecular mass RMM
35. Is not asymetric and cannot have multiple configurations
free radical
any carbon with double bonds or repeated substituents
weight average molecular weight Mw
trans - conformation
36. Relative configuration of adjecent asymmetric carbons
polymers
monomers
mutual termination
tacticity
37. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
tow
random copolymers
any carbon with double bonds or repeated substituents
side groups/ substituents
38. 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
trans - conformation
condensation/step- growth polymerization
relative molecular mass RMM
termination
39. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
tacticity
rayon
stabilizers
termination
40. One type of polymer that contains at least 85% of polyacrylonitrile PAN
pigments
polymers
glass transition temperature Tg
acrylic
41. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
polymers
dyes
tow
fillers
42. Number of bonds a molecule has formed
polyamides
functionality
tacticity
polyesters
43. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
asymetric
copolymer
side groups/ substituents
44. Polymers that contain amide (- N-) groups in the chain
coloring agents
additives
polyamides
pigments
45. Simple polymeric material produced as pellets in large quantities
condensation/step- growth polymerization
polyamides
High volume thermoplastics HVTP
termination
46. Broad category of polymers that includes polymers containing urethane linkages
thermoplastics
gauche conformation
polyurethanes
atactic
47. Covalent bonding of the polymer backbone and side groups
primary bonding
block copolymers
thermosets
glass transition temperature Tg
48. Molecule containing a highly reactive unpaired electron
injection molding
thermoplastics
eclipsed conformation/ cis - conformation
free radical
49. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
blends
fillers
polyamides
stabilizers
50. An acid and an alcohol
melt spinning
most common condensation/step- growth polymerization occur between....
screen pack
thermoplastics