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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. 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
glass transition temperature Tg
condensation/step- growth polymerization
random copolymers
poly- p- phenylene benzobisoxazole PBO
2. Coloring agents that do not dissolve into the polymer
pigments
termination
end groups
oligomers
3. Arrangement of the largest substituents where the substituets are offset by 120
solution spinning
staggered conformation
secondary bonding
isotactic dan
4. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
cracking
fillers
shot size
polymers
5. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
melt spinning
polypphenylene terephyhalamide PPTA
barrel
6. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
addition polymerization/chain growth/free- radical polymerization
syndiotactic dyad
dyes
7. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
random copolymers
functionality
plasticizers
8. 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
freeze line
polyurethanes
screen pack
isotactic dan
9. 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
glass transition temperature Tg
secondary bonding
tacticity
10. Polymers that contain amide (- N-) groups in the chain
syndiotactic dyad
thermoplastics
secondary bonding
polyamides
11. Two or more polymers mechanically mixed together but without covalent bonding between them
plyacrylonitrile PAN
copolymer
step- growth/condensation polymerization
blends
12. 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
most common condensation/step- growth polymerization occur between....
viscose process
melt spinning
termination
13. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
pigments
fillers
vinyl monomer
hopper
14. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
secondary bonding
degree of polymerization DPn
rayon
polyesters
15. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
eclipsed conformation/ cis - conformation
plasticizers
trans - conformation
16. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
additives
polyesters
syndiotactic dyad
staggered conformation
17. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
barrel
homopolymer
degree of polymerization DPn
18. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
any carbon with double bonds or repeated substituents
conformation
condensation/step- growth polymerization
addition polymerization/chain growth/free- radical polymerization
19. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
shot size
vulcanization
side groups/ substituents
most common condensation/step- growth polymerization occur between....
20. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
solution spinning
dyes
atactic
tow
21. 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
condensation/step- growth polymerization
petroleum
solution spinning
22. 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
constitution
tacticity
step- growth/condensation polymerization
branching
23. 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
screen pack
extruder
functional groups
24. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
shot size
rayon
polymer backbone
tow
25. First step in the process of polymerization - during which a free radical is formed
initiation
degree of polymerization DPn
addition polymerization/chain growth/free- radical polymerization
propagation
26. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
fillers
mutual termination
configuration
27. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
tow
spinneret
solution spinning
28. 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
blends
injection molding
polyesters
barrel
29. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
thermosets
staggered conformation
polymer backbone
30. Pigments or dyes that change the way light is absorbed or reflected by a polymer
dyes
constitution
end groups
coloring agents
31. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
die
step- growth/condensation polymerization
glass transition temperature Tg
32. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
step- growth/condensation polymerization
polymer backbone
configuration
33. 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
functionality
thermoplastics
barrel
constitution
34. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
syndiotactic dyad
tow
staggered conformation
configuration
35. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
stabilizers
degree of polymerization DPn
polymers
36. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
quenching
polyviyl chloride PVC
polypphenylene terephyhalamide PPTA
polyesters
37. 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
initiation
polypphenylene terephyhalamide PPTA
die
syndiotactic dyad
38. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
thermosets
side groups/ substituents
rayon
39. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
polymethylmethacrylate PMMA
glass transition temperature Tg
thermosets
functional groups
40. Porcess of breaking large organic hydrocarbons into smaller molecules
condensation/step- growth polymerization
free radical
cracking
mutual termination
41. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
structural unit
any carbon with double bonds or repeated substituents
injection molding
polymethylmethacrylate PMMA
42. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polyesters
elastomers
eclipsed conformation/ cis - conformation
primary bonding
43. Atoms attached to the polymer backbone.
homopolymer
relative molecular mass RMM
side groups/ substituents
High volume thermoplastics HVTP
44. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
injection molding
weight average molecular weight Mw
end groups
staggered conformation
45. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
functionality
petroleum
copolymer
poly- p- phenylene benzobisoxazole PBO
46. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
condensation/step- growth polymerization
additives
polyurethanes
extruder
47. 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
plasticizers
homopolymer
block copolymers
48. Covalently bonded chains of molecules with small monomer units repeated from end to end
graft copolymers
polymers
nylon
poly- p- phenylene benzobisoxazole PBO
49. Conformation that occurs when the largest substituent in a molecule are offset by 60
branching
tacticity
gauche conformation
solution spinning
50. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
die
polypphenylene terephyhalamide PPTA
propagation
solution spinning