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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. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
vulcanization
nylon
isotactic dan
2. 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
structural unit
relative molecular mass RMM
polypphenylene terephyhalamide PPTA
spinneret
3. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
viscose process
any carbon with double bonds or repeated substituents
secondary bonding
4. Relative configuration of adjecent asymmetric carbons
coloring agents
tacticity
screen pack
primary termination
5. Carbon atom capable of multiple configurations due to four different substituents
polypphenylene terephyhalamide PPTA
trans - conformation
poly- p- phenylene benzobisoxazole PBO
asymetric
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
blends
fillers
coloring agents
screen pack
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
injection molding
nylon
thermoplastics
primary termination
8. Softening agents
primary bonding
condensation/step- growth polymerization
addition polymerization/chain growth/free- radical polymerization
plasticizers
9. 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
structural unit
elastomers
plasticizers
solution spinning
10. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
primary bonding
additives
aramid
graft copolymers
11. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
polyamides
addition polymerization/chain growth/free- radical polymerization
extruder
fillers
12. Atoms attached to the polymer backbone.
side groups/ substituents
mutual termination
condensation/step- growth polymerization
random copolymers
13. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
stabilizers
graft copolymers
petroleum
termination
14. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
any carbon with double bonds or repeated substituents
plasticizers
trans - conformation
15. 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
screen pack
High volume thermoplastics HVTP
termination
16. 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
polyesters
condensation/step- growth polymerization
polypphenylene terephyhalamide PPTA
step- growth/condensation polymerization
17. Arrangement of the largest substituents where the substituets are offset by 120
weight average molecular weight Mw
elastomers
structural unit
staggered conformation
18. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
petroleum
oligomers
propagation
19. Conformation that occurs when the largest substituent in a molecule are offset by 60
acrylic
plyacrylonitrile PAN
gauche conformation
shot size
20. Primary raw material for most polymers
glass transition temperature Tg
quenching
petroleum
screen pack
21. Number of bonds a molecule has formed
functionality
isotactic dan
shot size
primary termination
22. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
weight average molecular weight Mw
primary termination
quenching
23. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
constitution
atactic
primary termination
vulcanization
24. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
melt spinning
die
cracking
25. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
secondary bonding
termination
configuration
High volume thermoplastics HVTP
26. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
cracking
termination
melt spinning
27. Covalently bonded chains of molecules with small monomer units repeated from end to end
addition polymerization/chain growth/free- radical polymerization
polymers
primary bonding
quenching
28. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
viscose process
coloring agents
extruder
aramid
29. One type of polymer that contains at least 85% of polyacrylonitrile PAN
polymers
addition polymerization/chain growth/free- radical polymerization
acrylic
functional groups
30. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
plasticizers
addition polymerization/chain growth/free- radical polymerization
stabilizers
polymethylmethacrylate PMMA
31. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
additives
branching
dyes
oligomers
32. Conformation in which the largest substituents are offset by 180
elastomers
atactic
trans - conformation
mutual termination
33. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
copolymer
alternating copolymers
plyacrylonitrile PAN
addition polymerization/chain growth/free- radical polymerization
34. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
solution spinning
plyacrylonitrile PAN
propagation
35. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
relative molecular mass RMM
polyesters
initiation
nylon
36. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polymer backbone
alternating copolymers
polypphenylene terephyhalamide PPTA
graft copolymers
37. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
additives
polymers
structural unit
tow
38. 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
alternating copolymers
quenching
number average molecular weight Mn
dyes
39. 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
cracking
isotactic dan
glass transition temperature Tg
mutual termination
40. 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
eclipsed conformation/ cis - conformation
die
extruder
block copolymers
41. Is not asymetric and cannot have multiple configurations
step- growth/condensation polymerization
polyesters
polyviyl chloride PVC
any carbon with double bonds or repeated substituents
42. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
homopolymer
polyesters
additives
43. Porcess of breaking large organic hydrocarbons into smaller molecules
screen pack
cracking
pigments
constitution
44. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
plasticizers
vulcanization
conformation
vinyl monomer
45. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
isotactic dan
configuration
addition polymerization/chain growth/free- radical polymerization
46. Additives whose primary purpose is to reduce the final cost of the product
aramid
any carbon with double bonds or repeated substituents
fillers
melt spinning
47. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
dyes
aramid
propagation
48. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
screen pack
viscose process
termination
constitution
49. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
initiation
thermoplastics
structural unit
polymethylmethacrylate PMMA
50. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
mutual termination
fillers
end groups
syndiotactic dyad