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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. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
atactic
rayon
configuration
2. Arrangement of the largest substituents where the substituets are offset by 120
termination
tow
staggered conformation
extruder
3. Smallest repeating unit in a polymer. aka repeat unit
elastomers
structural unit
asymetric
initiation
4. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
copolymer
polypphenylene terephyhalamide PPTA
tacticity
primary termination
5. 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
constitution
die
petroleum
barrel
6. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
elastomers
relative molecular mass RMM
screen pack
monomers
7. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
thermosets
coloring agents
dyes
barrel
8. Additives whose primary purpose is to reduce the final cost of the product
melt spinning
end groups
fillers
initiation
9. 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
gauche conformation
tow
functional groups
melt spinning
10. Relative configuration of adjecent asymmetric carbons
elastomers
configuration
tacticity
cracking
11. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
propagation
secondary bonding
vulcanization
12. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
end groups
glass transition temperature Tg
functional groups
dyes
13. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
block copolymers
shot size
poly- p- phenylene benzobisoxazole PBO
14. 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
polyesters
mutual termination
initiation
structural unit
15. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
polymer backbone
plasticizers
plyacrylonitrile PAN
alternating copolymers
16. Low- molecular- weight building blocks repeated in the polymer chain
graft copolymers
monomers
alternating copolymers
free radical
17. 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
conformation
poly- p- phenylene benzobisoxazole PBO
blends
18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
atactic
plasticizers
functionality
19. 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
elastomers
viscose process
relative molecular mass RMM
extruder
20. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
vulcanization
graft copolymers
stabilizers
plyacrylonitrile PAN
21. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
graft copolymers
condensation/step- growth polymerization
termination
elastomers
22. Is not asymetric and cannot have multiple configurations
copolymer
coloring agents
dyes
any carbon with double bonds or repeated substituents
23. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
plyacrylonitrile PAN
hopper
elastomers
polymer backbone
24. Molecule containing a highly reactive unpaired electron
extruder
die
additives
free radical
25. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
High volume thermoplastics HVTP
shot size
glass transition temperature Tg
26. Two or more polymers mechanically mixed together but without covalent bonding between them
functional groups
primary termination
blends
pigments
27. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
functionality
vinyl monomer
functional groups
28. Covalent bonding of the polymer backbone and side groups
primary bonding
functionality
tow
viscose process
29. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
thermosets
polyamides
syndiotactic dyad
dyes
30. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
polymers
polymer backbone
aramid
random copolymers
31. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
screen pack
atactic
constitution
secondary bonding
32. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water
condensation/step- growth polymerization
plasticizers
acrylic
alternating copolymers
33. Carbon atom capable of multiple configurations due to four different substituents
initiation
petroleum
functionality
asymetric
34. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
eclipsed conformation/ cis - conformation
atactic
plasticizers
fillers
35. 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
thermoplastics
step- growth/condensation polymerization
coloring agents
primary termination
36. Primary raw material for most polymers
thermosets
vulcanization
petroleum
primary termination
37. Polymer that is made up a single repeat unit
homopolymer
monomers
structural unit
plasticizers
38. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
mutual termination
eclipsed conformation/ cis - conformation
acrylic
39. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
monomers
tacticity
hopper
40. 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
fillers
polyesters
plyacrylonitrile PAN
polypphenylene terephyhalamide PPTA
41. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
melt spinning
High volume thermoplastics HVTP
eclipsed conformation/ cis - conformation
nylon
42. 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
polypphenylene terephyhalamide PPTA
oligomers
solution spinning
freeze line
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
viscose process
end groups
weight average molecular weight Mw
homopolymer
44. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
extruder
eclipsed conformation/ cis - conformation
side groups/ substituents
die
45. 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
stabilizers
die
configuration
46. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polypphenylene terephyhalamide PPTA
shot size
High volume thermoplastics HVTP
polymers
47. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
number average molecular weight Mn
addition polymerization/chain growth/free- radical polymerization
dyes
48. Polymers that contain amide (- N-) groups in the chain
polyamides
rayon
syndiotactic dyad
configuration
49. Number of bonds a molecule has formed
any carbon with double bonds or repeated substituents
functionality
branching
alternating copolymers
50. Porcess of breaking large organic hydrocarbons into smaller molecules
screen pack
secondary bonding
cracking
stabilizers