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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 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
staggered conformation
polymer backbone
step- growth/condensation polymerization
termination
2. 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
nylon
plasticizers
3. Broad category of polymers that includes polymers containing urethane linkages
functional groups
thermosets
propagation
polyurethanes
4. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
initiation
termination
vinyl monomer
weight average molecular weight Mw
5. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
aramid
random copolymers
injection molding
shot size
6. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
melt spinning
conformation
side groups/ substituents
polymethylmethacrylate PMMA
7. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
conformation
viscose process
step- growth/condensation polymerization
additives
8. Polymer that is made up a single repeat unit
branching
homopolymer
weight average molecular weight Mw
random copolymers
9. Is not asymetric and cannot have multiple configurations
conformation
any carbon with double bonds or repeated substituents
acrylic
oligomers
10. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
structural unit
initiation
polymer backbone
11. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
block copolymers
High volume thermoplastics HVTP
aramid
polypphenylene terephyhalamide PPTA
12. Two or more polymers mechanically mixed together but without covalent bonding between them
High volume thermoplastics HVTP
blends
polymer backbone
secondary bonding
13. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
poly- p- phenylene benzobisoxazole PBO
end groups
alternating copolymers
rayon
14. Relative configuration of adjecent asymmetric carbons
initiation
tacticity
propagation
trans - conformation
15. Polymer made up of two of more differenet monomers covalently bonded together
freeze line
copolymer
propagation
random copolymers
16. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
trans - conformation
syndiotactic dyad
secondary bonding
extruder
17. Coloring agents that do not dissolve into the polymer
polyviyl chloride PVC
termination
die
pigments
18. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
polyesters
polypphenylene terephyhalamide PPTA
viscose process
secondary bonding
19. 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
number average molecular weight Mn
end groups
secondary bonding
extruder
20. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
additives
tow
functionality
polymers
21. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
staggered conformation
thermosets
poly- p- phenylene benzobisoxazole PBO
polypphenylene terephyhalamide PPTA
22. Double bounded organic molecule used to begin addition polymerization
nylon
barrel
vinyl monomer
trans - conformation
23. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
plasticizers
spinneret
thermosets
functionality
24. 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
thermosets
barrel
alternating copolymers
polyurethanes
25. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
extruder
additives
nylon
atactic
26. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
plyacrylonitrile PAN
screen pack
polymers
vinyl monomer
27. 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
copolymer
isotactic dan
melt spinning
configuration
28. An acid and an alcohol
poly- p- phenylene benzobisoxazole PBO
termination
most common condensation/step- growth polymerization occur between....
melt spinning
29. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
functionality
conformation
oligomers
shot size
30. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polymethylmethacrylate PMMA
homopolymer
hopper
random copolymers
31. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
secondary bonding
asymetric
screen pack
eclipsed conformation/ cis - conformation
32. Simple polymeric material produced as pellets in large quantities
polymer backbone
polyesters
High volume thermoplastics HVTP
plasticizers
33. Number of bonds a molecule has formed
functionality
copolymer
injection molding
fillers
34. 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
relative molecular mass RMM
polyamides
condensation/step- growth polymerization
step- growth/condensation polymerization
35. 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
aramid
propagation
fillers
block copolymers
36. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
thermosets
polymers
end groups
vulcanization
37. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
configuration
acrylic
side groups/ substituents
stabilizers
38. Primary raw material for most polymers
polymethylmethacrylate PMMA
block copolymers
petroleum
fillers
39. Pigments or dyes that change the way light is absorbed or reflected by a polymer
acrylic
condensation/step- growth polymerization
coloring agents
aramid
40. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units
melt spinning
asymetric
isotactic dan
solution spinning
41. Molecule containing a highly reactive unpaired electron
most common condensation/step- growth polymerization occur between....
hopper
free radical
dyes
42. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
polyamides
elastomers
aramid
propagation
43. 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
polymers
condensation/step- growth polymerization
elastomers
polymer backbone
44. 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
propagation
conformation
elastomers
polyesters
45. 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
solution spinning
primary termination
random copolymers
vulcanization
46. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
termination
side groups/ substituents
solution spinning
47. Softening agents
shot size
functionality
plasticizers
solution spinning
48. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
functional groups
polymers
monomers
nylon
49. Smallest repeating unit in a polymer. aka repeat unit
structural unit
glass transition temperature Tg
acrylic
functional groups
50. 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
step- growth/condensation polymerization
monomers
hopper