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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. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
structural unit
primary termination
constitution
block copolymers
2. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
plyacrylonitrile PAN
conformation
polyviyl chloride PVC
injection molding
3. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polymethylmethacrylate PMMA
dyes
configuration
most common condensation/step- growth polymerization occur between....
4. Softening agents
tow
trans - conformation
plasticizers
blends
5. 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
most common condensation/step- growth polymerization occur between....
tacticity
solution spinning
block copolymers
6. Low- molecular- weight building blocks repeated in the polymer chain
most common condensation/step- growth polymerization occur between....
monomers
step- growth/condensation polymerization
addition polymerization/chain growth/free- radical polymerization
7. Conformation in which the largest substituents are offset by 180
isotactic dan
plasticizers
trans - conformation
viscose process
8. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
functional groups
random copolymers
cracking
rayon
9. Molecule containing a highly reactive unpaired electron
free radical
polypphenylene terephyhalamide PPTA
mutual termination
shot size
10. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
most common condensation/step- growth polymerization occur between....
secondary bonding
polyesters
11. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
constitution
polymethylmethacrylate PMMA
glass transition temperature Tg
12. 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
extruder
relative molecular mass RMM
freeze line
stabilizers
13. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
hopper
end groups
stabilizers
syndiotactic dyad
14. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
branching
polymer backbone
any carbon with double bonds or repeated substituents
asymetric
15. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
cracking
elastomers
eclipsed conformation/ cis - conformation
end groups
16. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
any carbon with double bonds or repeated substituents
screen pack
hopper
primary termination
17. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
polymer backbone
aramid
condensation/step- growth polymerization
oligomers
18. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
free radical
spinneret
random copolymers
side groups/ substituents
19. Conformation that occurs when the largest substituent in a molecule are offset by 60
glass transition temperature Tg
poly- p- phenylene benzobisoxazole PBO
cracking
gauche conformation
20. Polymer made up of two of more differenet monomers covalently bonded together
aramid
copolymer
weight average molecular weight Mw
polymethylmethacrylate PMMA
21. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
relative molecular mass RMM
screen pack
monomers
secondary bonding
22. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
random copolymers
syndiotactic dyad
primary termination
23. Is not asymetric and cannot have multiple configurations
rayon
any carbon with double bonds or repeated substituents
functionality
shot size
24. Pigments or dyes that change the way light is absorbed or reflected by a polymer
High volume thermoplastics HVTP
block copolymers
primary termination
coloring agents
25. 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
side groups/ substituents
quenching
graft copolymers
26. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process
viscose process
tacticity
mutual termination
glass transition temperature Tg
27. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
fillers
most common condensation/step- growth polymerization occur between....
primary bonding
spinneret
28. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
configuration
staggered conformation
primary bonding
graft copolymers
29. 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
coloring agents
free radical
weight average molecular weight Mw
solution spinning
30. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
functional groups
barrel
branching
31. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
syndiotactic dyad
hopper
thermosets
isotactic dan
32. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
oligomers
thermosets
injection molding
freeze line
33. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
barrel
polyesters
polymethylmethacrylate PMMA
atactic
34. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
additives
trans - conformation
configuration
35. Atoms attached to the polymer backbone.
cracking
side groups/ substituents
staggered conformation
High volume thermoplastics HVTP
36. Coloring agents that do not dissolve into the polymer
block copolymers
copolymer
pigments
additives
37. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
rayon
polyesters
shot size
polypphenylene terephyhalamide PPTA
38. 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
solution spinning
polyesters
gauche conformation
39. Polymers that contain amide (- N-) groups in the chain
primary termination
polyamides
thermoplastics
polypphenylene terephyhalamide PPTA
40. Smallest repeating unit in a polymer. aka repeat unit
tow
copolymer
melt spinning
structural unit
41. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
quenching
elastomers
alternating copolymers
asymetric
42. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
eclipsed conformation/ cis - conformation
most common condensation/step- growth polymerization occur between....
plyacrylonitrile PAN
extruder
43. Carbon atom capable of multiple configurations due to four different substituents
asymetric
relative molecular mass RMM
block copolymers
stabilizers
44. Covalent bonding of the polymer backbone and side groups
primary bonding
termination
structural unit
plasticizers
45. Broad category of polymers that includes polymers containing urethane linkages
syndiotactic dyad
polymers
trans - conformation
polyurethanes
46. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
copolymer
spinneret
thermoplastics
atactic
47. 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
polyesters
eclipsed conformation/ cis - conformation
hopper
branching
48. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
secondary bonding
random copolymers
melt spinning
atactic
49. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
vulcanization
functional groups
step- growth/condensation polymerization
viscose process
50. Arrangement of the largest substituents where the substituets are offset by 120
shot size
poly- p- phenylene benzobisoxazole PBO
primary termination
staggered conformation