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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. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
shot size
tow
functional groups
hopper
2. Low- molecular- weight building blocks repeated in the polymer chain
monomers
random copolymers
graft copolymers
propagation
3. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
configuration
weight average molecular weight Mw
vinyl monomer
screen pack
4. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
quenching
viscose process
polymethylmethacrylate PMMA
poly- p- phenylene benzobisoxazole PBO
5. Number of bonds a molecule has formed
relative molecular mass RMM
functional groups
functionality
glass transition temperature Tg
6. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
injection molding
oligomers
viscose process
addition polymerization/chain growth/free- radical polymerization
7. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
cracking
polypphenylene terephyhalamide PPTA
free radical
screen pack
8. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
eclipsed conformation/ cis - conformation
dyes
melt spinning
plasticizers
9. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
nylon
any carbon with double bonds or repeated substituents
quenching
atactic
10. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
blends
fillers
freeze line
step- growth/condensation polymerization
11. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
syndiotactic dyad
isotactic dan
degree of polymerization DPn
vulcanization
12. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
polymers
alternating copolymers
primary termination
oligomers
13. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
conformation
alternating copolymers
termination
rayon
14. Number of repeat/structural units in a polymer chain
dyes
constitution
vinyl monomer
degree of polymerization DPn
15. Pigments or dyes that change the way light is absorbed or reflected by a polymer
blends
extruder
coloring agents
eclipsed conformation/ cis - conformation
16. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
plasticizers
elastomers
termination
initiation
17. Additives whose primary purpose is to reduce the final cost of the product
die
fillers
weight average molecular weight Mw
random copolymers
18. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
tacticity
injection molding
initiation
melt spinning
19. 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
cracking
eclipsed conformation/ cis - conformation
gauche conformation
barrel
20. 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
functional groups
polyurethanes
nylon
branching
21. 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
vulcanization
condensation/step- growth polymerization
plasticizers
atactic
22. First step in the process of polymerization - during which a free radical is formed
initiation
die
stabilizers
oligomers
23. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
eclipsed conformation/ cis - conformation
spinneret
secondary bonding
mutual termination
24. Polymer made up of two of more differenet monomers covalently bonded together
polymer backbone
thermoplastics
copolymer
blends
25. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
end groups
configuration
staggered conformation
polyviyl chloride PVC
26. 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
High volume thermoplastics HVTP
freeze line
hopper
glass transition temperature Tg
27. Two or more polymers mechanically mixed together but without covalent bonding between them
tow
quenching
graft copolymers
blends
28. Conformation that occurs when the largest substituent in a molecule are offset by 60
quenching
constitution
hopper
gauche conformation
29. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
polymer backbone
structural unit
termination
30. Carbon atom capable of multiple configurations due to four different substituents
asymetric
pigments
conformation
most common condensation/step- growth polymerization occur between....
31. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
freeze line
atactic
stabilizers
polymers
32. 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
termination
coloring agents
number average molecular weight Mn
end groups
33. Primary raw material for most polymers
number average molecular weight Mn
petroleum
dyes
termination
34. Coloring agents that do not dissolve into the polymer
pigments
injection molding
asymetric
mutual termination
35. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polymethylmethacrylate PMMA
elastomers
solution spinning
constitution
36. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
homopolymer
plyacrylonitrile PAN
alternating copolymers
vulcanization
37. Polymers that contain amide (- N-) groups in the chain
hopper
step- growth/condensation polymerization
primary bonding
polyamides
38. Conformation in which the largest substituents are offset by 180
pigments
coloring agents
thermosets
trans - conformation
39. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
viscose process
mutual termination
functional groups
block copolymers
40. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
melt spinning
polyurethanes
graft copolymers
41. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
conformation
acrylic
addition polymerization/chain growth/free- radical polymerization
42. 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
polyamides
polyesters
extruder
secondary bonding
43. 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
fillers
plasticizers
die
constitution
44. Polymer that is made up a single repeat unit
alternating copolymers
rayon
homopolymer
syndiotactic dyad
45. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
shot size
addition polymerization/chain growth/free- radical polymerization
propagation
46. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
dyes
termination
polyesters
initiation
47. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
plasticizers
thermosets
hopper
free radical
48. Simple polymeric material produced as pellets in large quantities
graft copolymers
nylon
mutual termination
High volume thermoplastics HVTP
49. 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
trans - conformation
degree of polymerization DPn
plasticizers
condensation/step- growth polymerization
50. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
syndiotactic dyad
alternating copolymers
primary bonding