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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. Primary raw material for most polymers
vinyl monomer
condensation/step- growth polymerization
addition polymerization/chain growth/free- radical polymerization
petroleum
2. 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
pigments
aramid
tow
3. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
oligomers
polyviyl chloride PVC
polyurethanes
4. Is not asymetric and cannot have multiple configurations
mutual termination
any carbon with double bonds or repeated substituents
polypphenylene terephyhalamide PPTA
pigments
5. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
polypphenylene terephyhalamide PPTA
plasticizers
solution spinning
plyacrylonitrile PAN
6. Atoms attached to the polymer backbone.
petroleum
side groups/ substituents
hopper
condensation/step- growth polymerization
7. 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
atactic
dyes
polyviyl chloride PVC
block copolymers
8. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
monomers
copolymer
conformation
9. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
plasticizers
atactic
blends
polypphenylene terephyhalamide PPTA
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
nylon
plyacrylonitrile PAN
branching
hopper
11. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
plyacrylonitrile PAN
free radical
primary bonding
12. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
free radical
functionality
end groups
relative molecular mass RMM
13. 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
barrel
weight average molecular weight Mw
functional groups
polymers
14. 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
blends
block copolymers
relative molecular mass RMM
plyacrylonitrile PAN
15. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
polyamides
plasticizers
condensation/step- growth polymerization
propagation
16. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
free radical
tow
condensation/step- growth polymerization
rayon
17. Carbon atom capable of multiple configurations due to four different substituents
asymetric
tacticity
random copolymers
plasticizers
18. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
cracking
hopper
stabilizers
degree of polymerization DPn
19. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
conformation
degree of polymerization DPn
weight average molecular weight Mw
20. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
alternating copolymers
functionality
extruder
atactic
21. Covalent bonding of the polymer backbone and side groups
initiation
primary bonding
acrylic
plasticizers
22. 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
High volume thermoplastics HVTP
condensation/step- growth polymerization
dyes
plasticizers
23. Polymer that is made up a single repeat unit
syndiotactic dyad
primary bonding
plyacrylonitrile PAN
homopolymer
24. Low- molecular- weight building blocks repeated in the polymer chain
polyurethanes
acrylic
poly- p- phenylene benzobisoxazole PBO
monomers
25. 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
mutual termination
quenching
additives
26. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
aramid
graft copolymers
branching
27. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
isotactic dan
spinneret
end groups
free radical
28. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
propagation
addition polymerization/chain growth/free- radical polymerization
elastomers
polyamides
29. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
blends
syndiotactic dyad
functionality
aramid
30. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
asymetric
functionality
cracking
31. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
tow
aramid
additives
32. Additives whose primary purpose is to reduce the final cost of the product
pigments
viscose process
fillers
any carbon with double bonds or repeated substituents
33. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
polymer backbone
plasticizers
thermoplastics
High volume thermoplastics HVTP
34. Number of repeat/structural units in a polymer chain
vulcanization
fillers
degree of polymerization DPn
condensation/step- growth polymerization
35. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
isotactic dan
oligomers
pigments
mutual termination
36. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
coloring agents
polyurethanes
thermoplastics
elastomers
37. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
poly- p- phenylene benzobisoxazole PBO
thermosets
High volume thermoplastics HVTP
weight average molecular weight Mw
38. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
secondary bonding
screen pack
primary termination
39. 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
branching
vulcanization
number average molecular weight Mn
tow
40. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
homopolymer
primary termination
extruder
die
41. 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
thermosets
solution spinning
hopper
mutual termination
42. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
atactic
poly- p- phenylene benzobisoxazole PBO
extruder
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
primary bonding
functionality
monomers
weight average molecular weight Mw
44. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
polypphenylene terephyhalamide PPTA
screen pack
initiation
petroleum
45. Coloring agents that do not dissolve into the polymer
mutual termination
quenching
screen pack
pigments
46. Porcess of breaking large organic hydrocarbons into smaller molecules
polyesters
tow
atactic
cracking
47. An acid and an alcohol
polymers
most common condensation/step- growth polymerization occur between....
polyurethanes
glass transition temperature Tg
48. Number of bonds a molecule has formed
functionality
tow
alternating copolymers
glass transition temperature Tg
49. 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
dyes
condensation/step- growth polymerization
isotactic dan
polymers
50. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
hopper
additives
polymer backbone
die