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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. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
any carbon with double bonds or repeated substituents
extruder
conformation
2. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polymers
most common condensation/step- growth polymerization occur between....
eclipsed conformation/ cis - conformation
High volume thermoplastics HVTP
3. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
polymethylmethacrylate PMMA
quenching
melt spinning
4. 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
step- growth/condensation polymerization
trans - conformation
condensation/step- growth polymerization
primary bonding
5. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
step- growth/condensation polymerization
configuration
oligomers
secondary bonding
6. Two or more polymers mechanically mixed together but without covalent bonding between them
extruder
blends
screen pack
block copolymers
7. Number of bonds a molecule has formed
free radical
functionality
melt spinning
monomers
8. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
tow
viscose process
additives
initiation
9. Pigments or dyes that change the way light is absorbed or reflected by a polymer
thermoplastics
polymethylmethacrylate PMMA
coloring agents
spinneret
10. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
rayon
screen pack
quenching
atactic
11. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
barrel
viscose process
plyacrylonitrile PAN
configuration
12. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
rayon
viscose process
branching
13. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
oligomers
number average molecular weight Mn
alternating copolymers
polyviyl chloride PVC
14. 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
polyesters
branching
condensation/step- growth polymerization
additives
15. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
isotactic dan
syndiotactic dyad
plyacrylonitrile PAN
vinyl monomer
16. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
atactic
polymethylmethacrylate PMMA
barrel
tow
17. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
secondary bonding
copolymer
elastomers
polyesters
18. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
constitution
syndiotactic dyad
additives
fillers
19. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
free radical
quenching
die
polypphenylene terephyhalamide PPTA
20. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
stabilizers
freeze line
syndiotactic dyad
rayon
21. 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
polyesters
die
aramid
free radical
22. Carbon atom capable of multiple configurations due to four different substituents
polypphenylene terephyhalamide PPTA
asymetric
polyviyl chloride PVC
free radical
23. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
mutual termination
thermosets
nylon
pigments
24. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
solution spinning
propagation
alternating copolymers
25. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
structural unit
homopolymer
condensation/step- growth polymerization
26. Porcess of breaking large organic hydrocarbons into smaller molecules
isotactic dan
polyesters
cracking
nylon
27. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
plyacrylonitrile PAN
oligomers
aramid
structural unit
28. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
staggered conformation
rayon
shot size
polyamides
29. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
configuration
termination
injection molding
30. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
freeze line
polymethylmethacrylate PMMA
aramid
31. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
petroleum
plyacrylonitrile PAN
mutual termination
32. Polymers that contain amide (- N-) groups in the chain
polyamides
solution spinning
rayon
shot size
33. 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
poly- p- phenylene benzobisoxazole PBO
termination
polyesters
atactic
34. Smallest repeating unit in a polymer. aka repeat unit
mutual termination
aramid
structural unit
isotactic dan
35. Atoms attached to the polymer backbone.
side groups/ substituents
functionality
dyes
tow
36. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
trans - conformation
random copolymers
vulcanization
constitution
37. 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
isotactic dan
monomers
block copolymers
vinyl monomer
38. Low- molecular- weight building blocks repeated in the polymer chain
number average molecular weight Mn
monomers
constitution
elastomers
39. Double bounded organic molecule used to begin addition polymerization
injection molding
free radical
vinyl monomer
hopper
40. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
configuration
plyacrylonitrile PAN
random copolymers
41. Molecule containing a highly reactive unpaired electron
free radical
conformation
quenching
functionality
42. Coloring agents that do not dissolve into the polymer
graft copolymers
any carbon with double bonds or repeated substituents
pigments
block copolymers
43. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
condensation/step- growth polymerization
syndiotactic dyad
fillers
44. 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
free radical
conformation
poly- p- phenylene benzobisoxazole PBO
45. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
alternating copolymers
elastomers
asymetric
termination
46. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
shot size
additives
viscose process
addition polymerization/chain growth/free- radical polymerization
47. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
tacticity
fillers
stabilizers
screen pack
48. 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
conformation
solution spinning
weight average molecular weight Mw
melt spinning
49. Relative configuration of adjecent asymmetric carbons
structural unit
mutual termination
tacticity
polymers
50. Additives whose primary purpose is to reduce the final cost of the product
oligomers
any carbon with double bonds or repeated substituents
fillers
freeze line