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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. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
constitution
staggered conformation
block copolymers
configuration
2. 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
aramid
tacticity
mutual termination
homopolymer
3. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
melt spinning
tow
most common condensation/step- growth polymerization occur between....
degree of polymerization DPn
4. Polymer that is made up a single repeat unit
homopolymer
branching
acrylic
screen pack
5. Carbon atom capable of multiple configurations due to four different substituents
degree of polymerization DPn
plyacrylonitrile PAN
asymetric
hopper
6. 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
injection molding
plasticizers
side groups/ substituents
7. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
solution spinning
elastomers
vinyl monomer
stabilizers
8. Coloring agents that do not dissolve into the polymer
solution spinning
random copolymers
atactic
pigments
9. 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
quenching
number average molecular weight Mn
10. 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
functional groups
additives
polyamides
weight average molecular weight Mw
11. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
homopolymer
atactic
side groups/ substituents
syndiotactic dyad
12. Two or more polymers mechanically mixed together but without covalent bonding between them
cracking
nylon
blends
polyurethanes
13. Additives whose primary purpose is to reduce the final cost of the product
shot size
barrel
fillers
structural unit
14. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
block copolymers
quenching
end groups
15. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
plyacrylonitrile PAN
polypphenylene terephyhalamide PPTA
oligomers
16. 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
additives
initiation
block copolymers
High volume thermoplastics HVTP
17. First step in the process of polymerization - during which a free radical is formed
initiation
structural unit
polymer backbone
polypphenylene terephyhalamide PPTA
18. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
oligomers
blends
block copolymers
19. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
thermoplastics
glass transition temperature Tg
spinneret
poly- p- phenylene benzobisoxazole PBO
20. 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
additives
configuration
spinneret
21. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
monomers
copolymer
poly- p- phenylene benzobisoxazole PBO
22. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
solution spinning
termination
injection molding
primary termination
23. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
additives
polyurethanes
alternating copolymers
primary termination
24. Atoms attached to the polymer backbone.
alternating copolymers
side groups/ substituents
graft copolymers
configuration
25. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
addition polymerization/chain growth/free- radical polymerization
additives
pigments
alternating copolymers
26. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
termination
polymer backbone
primary bonding
27. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
thermoplastics
eclipsed conformation/ cis - conformation
rayon
end groups
28. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
copolymer
degree of polymerization DPn
condensation/step- growth polymerization
29. Conformation in which the largest substituents are offset by 180
rayon
coloring agents
trans - conformation
constitution
30. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
structural unit
mutual termination
constitution
31. Double bounded organic molecule used to begin addition polymerization
most common condensation/step- growth polymerization occur between....
isotactic dan
polyesters
vinyl monomer
32. Covalently bonded chains of molecules with small monomer units repeated from end to end
asymetric
initiation
polymers
random copolymers
33. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
any carbon with double bonds or repeated substituents
number average molecular weight Mn
homopolymer
34. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
degree of polymerization DPn
block copolymers
rayon
vulcanization
35. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
blends
dyes
thermosets
36. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
configuration
plasticizers
homopolymer
plyacrylonitrile PAN
37. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
number average molecular weight Mn
tacticity
screen pack
barrel
38. 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
melt spinning
polymethylmethacrylate PMMA
glass transition temperature Tg
nylon
39. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
trans - conformation
branching
polypphenylene terephyhalamide PPTA
shot size
40. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
branching
gauche conformation
die
41. Low- molecular- weight building blocks repeated in the polymer chain
monomers
solution spinning
polypphenylene terephyhalamide PPTA
copolymer
42. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
staggered conformation
rayon
vinyl monomer
polymer backbone
43. Pigments or dyes that change the way light is absorbed or reflected by a polymer
dyes
spinneret
coloring agents
melt spinning
44. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
alternating copolymers
poly- p- phenylene benzobisoxazole PBO
aramid
polyamides
45. Polymer made up of two of more differenet monomers covalently bonded together
step- growth/condensation polymerization
alternating copolymers
vulcanization
copolymer
46. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
blends
constitution
screen pack
elastomers
47. Conformation that occurs when the largest substituent in a molecule are offset by 60
pigments
weight average molecular weight Mw
tow
gauche conformation
48. 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
isotactic dan
homopolymer
49. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
structural unit
mutual termination
elastomers
50. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
barrel
rayon
condensation/step- growth polymerization
die