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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. 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
asymetric
solution spinning
trans - conformation
rayon
2. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
conformation
quenching
polyesters
3. Pigments or dyes that change the way light is absorbed or reflected by a polymer
step- growth/condensation polymerization
freeze line
poly- p- phenylene benzobisoxazole PBO
coloring agents
4. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
thermoplastics
aramid
screen pack
mutual termination
5. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polyviyl chloride PVC
shot size
gauche conformation
mutual termination
6. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
monomers
viscose process
mutual termination
7. Carbon atom capable of multiple configurations due to four different substituents
termination
primary termination
asymetric
branching
8. Primary raw material for most polymers
barrel
primary bonding
petroleum
rayon
9. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyesters
petroleum
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
10. 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
polymers
branching
polyamides
freeze line
11. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
plyacrylonitrile PAN
viscose process
most common condensation/step- growth polymerization occur between....
12. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
any carbon with double bonds or repeated substituents
melt spinning
viscose process
hopper
13. 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
elastomers
cracking
rayon
14. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
thermosets
conformation
alternating copolymers
initiation
15. 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
step- growth/condensation polymerization
glass transition temperature Tg
coloring agents
polyviyl chloride PVC
16. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
die
hopper
viscose process
gauche conformation
17. Number of bonds a molecule has formed
functional groups
functionality
cracking
polyviyl chloride PVC
18. Conformation that occurs when the largest substituent in a molecule are offset by 60
oligomers
quenching
gauche conformation
thermoplastics
19. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
configuration
injection molding
constitution
extruder
20. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
thermosets
elastomers
end groups
cracking
21. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
polypphenylene terephyhalamide PPTA
freeze line
termination
dyes
22. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
polymer backbone
primary termination
condensation/step- growth polymerization
poly- p- phenylene benzobisoxazole PBO
23. Covalently bonded chains of molecules with small monomer units repeated from end to end
spinneret
nylon
tacticity
polymers
24. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
side groups/ substituents
tacticity
tow
25. 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
primary bonding
number average molecular weight Mn
thermosets
petroleum
26. Coloring agents that do not dissolve into the polymer
injection molding
pigments
isotactic dan
side groups/ substituents
27. Relative configuration of adjecent asymmetric carbons
tacticity
fillers
stabilizers
condensation/step- growth polymerization
28. 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
condensation/step- growth polymerization
atactic
step- growth/condensation polymerization
free radical
29. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
syndiotactic dyad
addition polymerization/chain growth/free- radical polymerization
initiation
polypphenylene terephyhalamide PPTA
30. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
plyacrylonitrile PAN
freeze line
trans - conformation
31. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
asymetric
constitution
staggered conformation
termination
32. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
rayon
polymer backbone
side groups/ substituents
33. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
High volume thermoplastics HVTP
coloring agents
extruder
stabilizers
34. 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
secondary bonding
freeze line
monomers
block copolymers
35. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
cracking
graft copolymers
vulcanization
36. Two or more polymers mechanically mixed together but without covalent bonding between them
polyurethanes
relative molecular mass RMM
blends
petroleum
37. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
additives
dyes
polymer backbone
branching
38. Number of repeat/structural units in a polymer chain
side groups/ substituents
viscose process
degree of polymerization DPn
staggered conformation
39. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
glass transition temperature Tg
aramid
polymethylmethacrylate PMMA
thermosets
40. 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
polyesters
coloring agents
barrel
melt spinning
41. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
functionality
copolymer
propagation
rayon
42. 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
monomers
polyviyl chloride PVC
step- growth/condensation polymerization
43. Smallest repeating unit in a polymer. aka repeat unit
addition polymerization/chain growth/free- radical polymerization
die
structural unit
degree of polymerization DPn
44. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
quenching
petroleum
nylon
plyacrylonitrile PAN
45. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
barrel
degree of polymerization DPn
die
eclipsed conformation/ cis - conformation
46. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
die
mutual termination
screen pack
47. 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
termination
quenching
mutual termination
propagation
48. Conformation in which the largest substituents are offset by 180
tacticity
propagation
trans - conformation
degree of polymerization DPn
49. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
vinyl monomer
dyes
shot size
functional groups
50. 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
thermosets
trans - conformation
isotactic dan
polymers