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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. 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
mutual termination
number average molecular weight Mn
thermosets
tacticity
2. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
structural unit
plasticizers
thermosets
secondary bonding
3. Molecule containing a highly reactive unpaired electron
free radical
isotactic dan
functionality
pigments
4. 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
injection molding
constitution
random copolymers
5. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polymethylmethacrylate PMMA
shot size
glass transition temperature Tg
tacticity
6. Conformation that occurs when the largest substituent in a molecule are offset by 60
vinyl monomer
initiation
elastomers
gauche conformation
7. One type of polymer that contains at least 85% of polyacrylonitrile PAN
tow
pigments
atactic
acrylic
8. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
plasticizers
polymers
homopolymer
9. Is not asymetric and cannot have multiple configurations
degree of polymerization DPn
any carbon with double bonds or repeated substituents
gauche conformation
primary bonding
10. Covalently bonded chains of molecules with small monomer units repeated from end to end
constitution
plasticizers
barrel
polymers
11. Arrangement of the largest substituents where the substituets are offset by 120
thermoplastics
staggered conformation
additives
relative molecular mass RMM
12. 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
asymetric
polyamides
barrel
free radical
13. 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
pigments
condensation/step- growth polymerization
any carbon with double bonds or repeated substituents
end groups
14. Two or more polymers mechanically mixed together but without covalent bonding between them
termination
blends
polyesters
monomers
15. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
polyesters
conformation
termination
16. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
petroleum
branching
nylon
vinyl monomer
17. Polymers that contain amide (- N-) groups in the chain
polymethylmethacrylate PMMA
polyamides
polymer backbone
tow
18. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
freeze line
polymer backbone
any carbon with double bonds or repeated substituents
screen pack
19. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
solution spinning
polymethylmethacrylate PMMA
polypphenylene terephyhalamide PPTA
free radical
20. Number of bonds a molecule has formed
gauche conformation
syndiotactic dyad
addition polymerization/chain growth/free- radical polymerization
functionality
21. Coloring agents that do not dissolve into the polymer
initiation
polyamides
melt spinning
pigments
22. Porcess of breaking large organic hydrocarbons into smaller molecules
injection molding
functionality
cracking
shot size
23. 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
step- growth/condensation polymerization
glass transition temperature Tg
initiation
additives
24. Polymer that is made up a single repeat unit
High volume thermoplastics HVTP
block copolymers
oligomers
homopolymer
25. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
trans - conformation
vulcanization
mutual termination
26. Carbon atom capable of multiple configurations due to four different substituents
asymetric
polyamides
primary termination
relative molecular mass RMM
27. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
free radical
atactic
plyacrylonitrile PAN
stabilizers
28. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
polyviyl chloride PVC
solution spinning
cracking
29. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
freeze line
structural unit
aramid
die
30. 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
block copolymers
secondary bonding
branching
gauche conformation
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
thermoplastics
primary termination
tow
random copolymers
32. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
step- growth/condensation polymerization
condensation/step- growth polymerization
random copolymers
plasticizers
33. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
isotactic dan
alternating copolymers
degree of polymerization DPn
melt spinning
34. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
dyes
pigments
stabilizers
35. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
any carbon with double bonds or repeated substituents
petroleum
rayon
solution spinning
36. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
glass transition temperature Tg
polyurethanes
polyviyl chloride PVC
37. Conformation in which the largest substituents are offset by 180
polymethylmethacrylate PMMA
addition polymerization/chain growth/free- radical polymerization
trans - conformation
coloring agents
38. Smallest repeating unit in a polymer. aka repeat unit
secondary bonding
polyesters
any carbon with double bonds or repeated substituents
structural unit
39. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
nylon
petroleum
polyviyl chloride PVC
any carbon with double bonds or repeated substituents
40. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
asymetric
coloring agents
quenching
eclipsed conformation/ cis - conformation
41. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
rayon
plyacrylonitrile PAN
freeze line
poly- p- phenylene benzobisoxazole PBO
42. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
polyesters
vulcanization
hopper
43. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
polymers
viscose process
free radical
oligomers
44. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
homopolymer
copolymer
hopper
addition polymerization/chain growth/free- radical polymerization
45. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
cracking
side groups/ substituents
injection molding
polyurethanes
46. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
polyamides
barrel
rayon
47. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
dyes
oligomers
additives
primary bonding
48. Number of repeat/structural units in a polymer chain
tow
degree of polymerization DPn
poly- p- phenylene benzobisoxazole PBO
freeze line
49. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
conformation
secondary bonding
die
constitution
50. 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
configuration
die
dyes
poly- p- phenylene benzobisoxazole PBO