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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. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polyesters
freeze line
eclipsed conformation/ cis - conformation
pigments
2. 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
step- growth/condensation polymerization
tacticity
syndiotactic dyad
die
3. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polymers
structural unit
polypphenylene terephyhalamide PPTA
plyacrylonitrile PAN
4. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
die
polyamides
gauche conformation
end groups
5. One type of polymer that contains at least 85% of polyacrylonitrile PAN
monomers
acrylic
viscose process
branching
6. Primary raw material for most polymers
trans - conformation
polypphenylene terephyhalamide PPTA
petroleum
homopolymer
7. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
constitution
solution spinning
polymethylmethacrylate PMMA
8. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
barrel
aramid
screen pack
quenching
9. Two or more polymers mechanically mixed together but without covalent bonding between them
block copolymers
any carbon with double bonds or repeated substituents
gauche conformation
blends
10. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
dyes
thermosets
nylon
11. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
screen pack
step- growth/condensation polymerization
stabilizers
petroleum
12. Low- molecular- weight building blocks repeated in the polymer chain
polymer backbone
trans - conformation
monomers
poly- p- phenylene benzobisoxazole PBO
13. 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
High volume thermoplastics HVTP
polyamides
graft copolymers
14. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
atactic
acrylic
addition polymerization/chain growth/free- radical polymerization
graft copolymers
15. Atoms attached to the polymer backbone.
side groups/ substituents
nylon
High volume thermoplastics HVTP
asymetric
16. 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
number average molecular weight Mn
primary bonding
mutual termination
copolymer
17. Covalent bonding of the polymer backbone and side groups
primary bonding
tacticity
spinneret
isotactic dan
18. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
polyurethanes
aramid
coloring agents
19. Conformation in which the largest substituents are offset by 180
syndiotactic dyad
thermoplastics
trans - conformation
polyesters
20. 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
gauche conformation
barrel
condensation/step- growth polymerization
end groups
21. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
initiation
cracking
termination
22. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
polyviyl chloride PVC
tow
addition polymerization/chain growth/free- radical polymerization
23. Carbon atom capable of multiple configurations due to four different substituents
asymetric
cracking
stabilizers
aramid
24. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
hopper
coloring agents
aramid
25. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
copolymer
vinyl monomer
addition polymerization/chain growth/free- radical polymerization
conformation
26. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
thermoplastics
vulcanization
eclipsed conformation/ cis - conformation
asymetric
27. Broad category of polymers that includes polymers containing urethane linkages
initiation
functionality
degree of polymerization DPn
polyurethanes
28. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
atactic
solution spinning
condensation/step- growth polymerization
tow
29. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
constitution
termination
number average molecular weight Mn
monomers
30. Polymers that contain amide (- N-) groups in the chain
polyamides
polymethylmethacrylate PMMA
vulcanization
shot size
31. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
conformation
primary termination
die
step- growth/condensation polymerization
32. Additives whose primary purpose is to reduce the final cost of the product
fillers
stabilizers
random copolymers
extruder
33. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
cracking
propagation
glass transition temperature Tg
barrel
34. 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
random copolymers
acrylic
hopper
weight average molecular weight Mw
35. Polymer that is made up a single repeat unit
plasticizers
homopolymer
primary termination
oligomers
36. Porcess of breaking large organic hydrocarbons into smaller molecules
petroleum
cracking
fillers
copolymer
37. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
any carbon with double bonds or repeated substituents
petroleum
extruder
38. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
glass transition temperature Tg
poly- p- phenylene benzobisoxazole PBO
dyes
side groups/ substituents
39. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
block copolymers
staggered conformation
random copolymers
nylon
40. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
secondary bonding
configuration
acrylic
atactic
41. Arrangement of the largest substituents where the substituets are offset by 120
barrel
staggered conformation
shot size
eclipsed conformation/ cis - conformation
42. Pigments or dyes that change the way light is absorbed or reflected by a polymer
structural unit
coloring agents
syndiotactic dyad
copolymer
43. Relative configuration of adjecent asymmetric carbons
eclipsed conformation/ cis - conformation
solution spinning
fillers
tacticity
44. 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
polyviyl chloride PVC
copolymer
mutual termination
pigments
45. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
glass transition temperature Tg
additives
tacticity
syndiotactic dyad
46. Coloring agents that do not dissolve into the polymer
copolymer
additives
pigments
High volume thermoplastics HVTP
47. 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
polymethylmethacrylate PMMA
polymers
freeze line
48. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
graft copolymers
homopolymer
hopper
polyviyl chloride PVC
49. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
elastomers
asymetric
petroleum
alternating copolymers
50. 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
melt spinning
initiation
hopper