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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. Number of repeat/structural units in a polymer chain
number average molecular weight Mn
thermoplastics
degree of polymerization DPn
block copolymers
2. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tacticity
thermoplastics
most common condensation/step- growth polymerization occur between....
tow
3. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
eclipsed conformation/ cis - conformation
polymers
thermosets
4. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
isotactic dan
syndiotactic dyad
screen pack
functionality
5. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
injection molding
tacticity
propagation
glass transition temperature Tg
6. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
polyamides
fillers
pigments
poly- p- phenylene benzobisoxazole PBO
7. Pigments or dyes that change the way light is absorbed or reflected by a polymer
homopolymer
polymers
coloring agents
petroleum
8. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
graft copolymers
quenching
dyes
end groups
9. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
initiation
additives
degree of polymerization DPn
branching
10. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
trans - conformation
polyamides
elastomers
thermosets
11. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
tow
barrel
staggered conformation
12. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
blends
die
isotactic dan
spinneret
13. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
degree of polymerization DPn
mutual termination
screen pack
injection molding
14. Carbon atom capable of multiple configurations due to four different substituents
elastomers
condensation/step- growth polymerization
asymetric
side groups/ substituents
15. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
graft copolymers
gauche conformation
High volume thermoplastics HVTP
16. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
atactic
extruder
free radical
17. Smallest repeating unit in a polymer. aka repeat unit
structural unit
plasticizers
most common condensation/step- growth polymerization occur between....
eclipsed conformation/ cis - conformation
18. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
configuration
pigments
termination
primary termination
19. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
aramid
propagation
oligomers
atactic
20. Porcess of breaking large organic hydrocarbons into smaller molecules
eclipsed conformation/ cis - conformation
copolymer
free radical
cracking
21. Arrangement of the largest substituents where the substituets are offset by 120
initiation
free radical
staggered conformation
graft copolymers
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
dyes
solution spinning
step- growth/condensation polymerization
23. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
degree of polymerization DPn
viscose process
glass transition temperature Tg
initiation
24. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
degree of polymerization DPn
branching
isotactic dan
25. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polypphenylene terephyhalamide PPTA
shot size
stabilizers
weight average molecular weight Mw
26. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
graft copolymers
solution spinning
free radical
functional groups
27. Atoms attached to the polymer backbone.
side groups/ substituents
gauche conformation
block copolymers
nylon
28. Softening agents
polyurethanes
polymers
plasticizers
tow
29. Broad category of polymers that includes polymers containing urethane linkages
polymer backbone
polyurethanes
dyes
fillers
30. Relative configuration of adjecent asymmetric carbons
elastomers
weight average molecular weight Mw
asymetric
tacticity
31. 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
branching
any carbon with double bonds or repeated substituents
vinyl monomer
barrel
32. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
tow
viscose process
trans - conformation
random copolymers
33. Molecule containing a highly reactive unpaired electron
stabilizers
blends
free radical
primary bonding
34. Double bounded organic molecule used to begin addition polymerization
screen pack
vinyl monomer
polymethylmethacrylate PMMA
configuration
35. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
block copolymers
rayon
vinyl monomer
acrylic
36. 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
thermosets
copolymer
random copolymers
37. Coloring agents that do not dissolve into the polymer
melt spinning
pigments
free radical
plasticizers
38. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
poly- p- phenylene benzobisoxazole PBO
polymers
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
isotactic dan
dyes
number average molecular weight Mn
syndiotactic dyad
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
syndiotactic dyad
die
tacticity
end groups
41. Primary raw material for most polymers
eclipsed conformation/ cis - conformation
barrel
elastomers
petroleum
42. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
propagation
side groups/ substituents
structural unit
43. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
vulcanization
barrel
poly- p- phenylene benzobisoxazole PBO
thermoplastics
44. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polymer backbone
propagation
acrylic
constitution
45. Is not asymetric and cannot have multiple configurations
most common condensation/step- growth polymerization occur between....
any carbon with double bonds or repeated substituents
syndiotactic dyad
melt spinning
46. Additives whose primary purpose is to reduce the final cost of the product
fillers
constitution
plasticizers
polymers
47. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
constitution
plasticizers
primary bonding
functional groups
48. 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
pigments
graft copolymers
number average molecular weight Mn
49. 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
nylon
syndiotactic dyad
secondary bonding
relative molecular mass RMM
50. 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
weight average molecular weight Mw
relative molecular mass RMM
extruder
High volume thermoplastics HVTP