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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. 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
pigments
branching
plasticizers
any carbon with double bonds or repeated substituents
2. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
stabilizers
number average molecular weight Mn
elastomers
polyviyl chloride PVC
3. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
staggered conformation
syndiotactic dyad
homopolymer
4. 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
dyes
thermosets
freeze line
5. Pigments or dyes that change the way light is absorbed or reflected by a polymer
plasticizers
hopper
plyacrylonitrile PAN
coloring agents
6. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polyviyl chloride PVC
configuration
vinyl monomer
tacticity
7. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
polypphenylene terephyhalamide PPTA
number average molecular weight Mn
addition polymerization/chain growth/free- radical polymerization
termination
8. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
asymetric
isotactic dan
thermoplastics
blends
9. 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
plasticizers
pigments
quenching
structural unit
10. Molecule containing a highly reactive unpaired electron
vinyl monomer
free radical
oligomers
shot size
11. Coloring agents that do not dissolve into the polymer
mutual termination
gauche conformation
pigments
viscose process
12. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
gauche conformation
functional groups
dyes
13. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
termination
plasticizers
end groups
14. Is not asymetric and cannot have multiple configurations
copolymer
hopper
blends
any carbon with double bonds or repeated substituents
15. Number of repeat/structural units in a polymer chain
polymers
propagation
functionality
degree of polymerization DPn
16. 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
polyurethanes
die
aramid
degree of polymerization DPn
17. An acid and an alcohol
polyesters
condensation/step- growth polymerization
structural unit
most common condensation/step- growth polymerization occur between....
18. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
thermosets
most common condensation/step- growth polymerization occur between....
block copolymers
spinneret
19. Polymers that contain amide (- N-) groups in the chain
dyes
polyamides
any carbon with double bonds or repeated substituents
cracking
20. 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
conformation
random copolymers
melt spinning
polyamides
21. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
secondary bonding
rayon
die
vinyl monomer
22. Double bounded organic molecule used to begin addition polymerization
polyurethanes
extruder
configuration
vinyl monomer
23. Relative configuration of adjecent asymmetric carbons
High volume thermoplastics HVTP
plasticizers
tacticity
vulcanization
24. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
aramid
poly- p- phenylene benzobisoxazole PBO
copolymer
gauche conformation
25. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
weight average molecular weight Mw
branching
syndiotactic dyad
aramid
26. Softening agents
hopper
relative molecular mass RMM
atactic
plasticizers
27. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
branching
additives
vinyl monomer
polyamides
28. Polymer that is made up a single repeat unit
condensation/step- growth polymerization
homopolymer
any carbon with double bonds or repeated substituents
polypphenylene terephyhalamide PPTA
29. Atoms attached to the polymer backbone.
glass transition temperature Tg
thermosets
side groups/ substituents
degree of polymerization DPn
30. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
plasticizers
addition polymerization/chain growth/free- radical polymerization
free radical
dyes
31. 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
step- growth/condensation polymerization
block copolymers
dyes
pigments
32. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
addition polymerization/chain growth/free- radical polymerization
alternating copolymers
condensation/step- growth polymerization
thermosets
33. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
oligomers
constitution
plasticizers
34. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
dyes
blends
eclipsed conformation/ cis - conformation
staggered conformation
35. 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
staggered conformation
relative molecular mass RMM
stabilizers
viscose process
36. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
shot size
screen pack
hopper
vulcanization
37. One type of polymer that contains at least 85% of polyacrylonitrile PAN
nylon
relative molecular mass RMM
acrylic
polymethylmethacrylate PMMA
38. Additives whose primary purpose is to reduce the final cost of the product
block copolymers
melt spinning
mutual termination
fillers
39. Arrangement of the largest substituents where the substituets are offset by 120
asymetric
structural unit
vulcanization
staggered conformation
40. 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
fillers
syndiotactic dyad
glass transition temperature Tg
weight average molecular weight Mw
41. 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
termination
polyurethanes
solution spinning
gauche conformation
42. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
die
secondary bonding
copolymer
any carbon with double bonds or repeated substituents
43. 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
configuration
gauche conformation
alternating copolymers
44. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
atactic
trans - conformation
vulcanization
functional groups
45. Covalent bonding of the polymer backbone and side groups
fillers
primary bonding
elastomers
melt spinning
46. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
shot size
plyacrylonitrile PAN
spinneret
degree of polymerization DPn
47. Primary raw material for most polymers
polymethylmethacrylate PMMA
shot size
die
petroleum
48. Conformation in which the largest substituents are offset by 180
viscose process
trans - conformation
polymer backbone
die
49. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
injection molding
extruder
fillers
plasticizers
50. Two or more polymers mechanically mixed together but without covalent bonding between them
functional groups
blends
gauche conformation
plyacrylonitrile PAN