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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. Additives whose primary purpose is to reduce the final cost of the product
fillers
end groups
oligomers
injection molding
2. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
aramid
screen pack
asymetric
3. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
viscose process
extruder
degree of polymerization DPn
dyes
4. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
acrylic
polyesters
polymethylmethacrylate PMMA
thermoplastics
5. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
end groups
gauche conformation
poly- p- phenylene benzobisoxazole PBO
plyacrylonitrile PAN
6. 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
alternating copolymers
glass transition temperature Tg
condensation/step- growth polymerization
asymetric
7. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
plasticizers
screen pack
acrylic
8. 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
condensation/step- growth polymerization
constitution
addition polymerization/chain growth/free- radical polymerization
block copolymers
9. Low- molecular- weight building blocks repeated in the polymer chain
rayon
copolymer
monomers
weight average molecular weight Mw
10. 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
propagation
functionality
polymers
11. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
cracking
any carbon with double bonds or repeated substituents
polyviyl chloride PVC
addition polymerization/chain growth/free- radical polymerization
12. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
asymetric
viscose process
most common condensation/step- growth polymerization occur between....
13. Porcess of breaking large organic hydrocarbons into smaller molecules
thermoplastics
isotactic dan
cracking
freeze line
14. 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
die
functionality
termination
shot size
15. 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
number average molecular weight Mn
plyacrylonitrile PAN
viscose process
mutual termination
16. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
cracking
side groups/ substituents
termination
17. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
asymetric
gauche conformation
termination
number average molecular weight Mn
18. 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
eclipsed conformation/ cis - conformation
secondary bonding
polyurethanes
19. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
propagation
oligomers
poly- p- phenylene benzobisoxazole PBO
20. Atoms attached to the polymer backbone.
polypphenylene terephyhalamide PPTA
coloring agents
side groups/ substituents
propagation
21. Number of bonds a molecule has formed
blends
solution spinning
additives
functionality
22. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
cracking
extruder
random copolymers
23. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
rayon
melt spinning
additives
24. Polymer that is made up a single repeat unit
isotactic dan
homopolymer
screen pack
number average molecular weight Mn
25. One type of polymer that contains at least 85% of polyacrylonitrile PAN
step- growth/condensation polymerization
elastomers
screen pack
acrylic
26. Primary raw material for most polymers
syndiotactic dyad
petroleum
functionality
configuration
27. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
quenching
freeze line
injection molding
28. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
hopper
fillers
polypphenylene terephyhalamide PPTA
29. Pigments or dyes that change the way light is absorbed or reflected by a polymer
polymer backbone
alternating copolymers
coloring agents
quenching
30. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
extruder
plyacrylonitrile PAN
aramid
additives
31. Double bounded organic molecule used to begin addition polymerization
functional groups
polymethylmethacrylate PMMA
vinyl monomer
homopolymer
32. Coloring agents that do not dissolve into the polymer
condensation/step- growth polymerization
pigments
elastomers
polyurethanes
33. 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
step- growth/condensation polymerization
shot size
relative molecular mass RMM
elastomers
34. Softening agents
polymethylmethacrylate PMMA
polypphenylene terephyhalamide PPTA
plasticizers
eclipsed conformation/ cis - conformation
35. 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
extruder
gauche conformation
melt spinning
blends
36. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
condensation/step- growth polymerization
plasticizers
polymers
syndiotactic dyad
37. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
weight average molecular weight Mw
gauche conformation
thermosets
glass transition temperature Tg
38. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
gauche conformation
weight average molecular weight Mw
screen pack
39. Covalently bonded chains of molecules with small monomer units repeated from end to end
injection molding
polymers
graft copolymers
thermoplastics
40. Conformation in which the largest substituents are offset by 180
addition polymerization/chain growth/free- radical polymerization
trans - conformation
vulcanization
blends
41. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polypphenylene terephyhalamide PPTA
any carbon with double bonds or repeated substituents
polymer backbone
isotactic dan
42. Arrangement of the largest substituents where the substituets are offset by 120
polymers
branching
staggered conformation
injection molding
43. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
gauche conformation
vinyl monomer
quenching
44. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
extruder
tow
graft copolymers
functional groups
45. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
relative molecular mass RMM
gauche conformation
configuration
functional groups
46. 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
elastomers
pigments
solution spinning
functionality
47. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
extruder
random copolymers
propagation
polyesters
48. 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
elastomers
polymethylmethacrylate PMMA
barrel
secondary bonding
49. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
elastomers
polymer backbone
poly- p- phenylene benzobisoxazole PBO
stabilizers
50. 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
tow
initiation
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