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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 contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber
nylon
polyesters
barrel
elastomers
2. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
cracking
freeze line
side groups/ substituents
thermoplastics
3. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
hopper
eclipsed conformation/ cis - conformation
nylon
block copolymers
4. One type of polymer that contains at least 85% of polyacrylonitrile PAN
nylon
additives
acrylic
configuration
5. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
fillers
conformation
thermoplastics
aramid
6. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
random copolymers
mutual termination
viscose process
gauche conformation
7. Conformation that occurs when the largest substituent in a molecule are offset by 60
plasticizers
primary termination
gauche conformation
functionality
8. Coloring agents that do not dissolve into the polymer
condensation/step- growth polymerization
solution spinning
pigments
thermosets
9. Additives whose primary purpose is to reduce the final cost of the product
fillers
functional groups
isotactic dan
polymers
10. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
block copolymers
any carbon with double bonds or repeated substituents
dyes
thermoplastics
11. Covalent bonding of the polymer backbone and side groups
primary bonding
plasticizers
polyamides
free radical
12. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
quenching
alternating copolymers
polyamides
elastomers
13. Carbon atom capable of multiple configurations due to four different substituents
random copolymers
acrylic
quenching
asymetric
14. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
trans - conformation
polypphenylene terephyhalamide PPTA
degree of polymerization DPn
vinyl monomer
15. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
High volume thermoplastics HVTP
plasticizers
addition polymerization/chain growth/free- radical polymerization
functional groups
16. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
degree of polymerization DPn
random copolymers
thermoplastics
atactic
17. Simple polymeric material produced as pellets in large quantities
aramid
High volume thermoplastics HVTP
spinneret
vinyl monomer
18. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
plyacrylonitrile PAN
aramid
thermosets
19. 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
polyurethanes
shot size
free radical
melt spinning
20. 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
copolymer
secondary bonding
alternating copolymers
isotactic dan
21. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
acrylic
vulcanization
hopper
freeze line
22. Covalently bonded chains of molecules with small monomer units repeated from end to end
tacticity
nylon
polymers
injection molding
23. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
thermosets
polymethylmethacrylate PMMA
elastomers
primary termination
24. Broad category of polymers that includes polymers containing urethane linkages
condensation/step- growth polymerization
constitution
polyurethanes
polymethylmethacrylate PMMA
25. Low- molecular- weight building blocks repeated in the polymer chain
eclipsed conformation/ cis - conformation
monomers
alternating copolymers
plasticizers
26. 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
aramid
gauche conformation
asymetric
27. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
thermoplastics
degree of polymerization DPn
secondary bonding
primary bonding
28. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
alternating copolymers
aramid
petroleum
29. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
asymetric
polyurethanes
stabilizers
30. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA
graft copolymers
block copolymers
polyurethanes
termination
31. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
any carbon with double bonds or repeated substituents
poly- p- phenylene benzobisoxazole PBO
blends
polyviyl chloride PVC
32. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
random copolymers
extruder
fillers
step- growth/condensation polymerization
33. Polymer that is made up a single repeat unit
homopolymer
die
pigments
primary bonding
34. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
petroleum
secondary bonding
melt spinning
random copolymers
35. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
plasticizers
dyes
nylon
functionality
36. Polymers that contain amide (- N-) groups in the chain
injection molding
copolymer
polyamides
spinneret
37. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
spinneret
block copolymers
atactic
syndiotactic dyad
38. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
degree of polymerization DPn
poly- p- phenylene benzobisoxazole PBO
staggered conformation
polyurethanes
39. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
thermoplastics
fillers
hopper
40. Pigments or dyes that change the way light is absorbed or reflected by a polymer
polymer backbone
any carbon with double bonds or repeated substituents
isotactic dan
coloring agents
41. Polymer made up of two of more differenet monomers covalently bonded together
condensation/step- growth polymerization
polypphenylene terephyhalamide PPTA
copolymer
pigments
42. Primary raw material for most polymers
alternating copolymers
petroleum
poly- p- phenylene benzobisoxazole PBO
viscose process
43. First step in the process of polymerization - during which a free radical is formed
polypphenylene terephyhalamide PPTA
initiation
isotactic dan
termination
44. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
most common condensation/step- growth polymerization occur between....
barrel
coloring agents
graft copolymers
45. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
eclipsed conformation/ cis - conformation
acrylic
spinneret
injection molding
46. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
condensation/step- growth polymerization
quenching
alternating copolymers
weight average molecular weight Mw
47. Relative configuration of adjecent asymmetric carbons
elastomers
gauche conformation
functionality
tacticity
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
monomers
barrel
tacticity
weight average molecular weight Mw
49. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
polymer backbone
acrylic
polyviyl chloride PVC
plyacrylonitrile PAN
50. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
oligomers
plasticizers
vulcanization
functionality