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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. 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
mutual termination
primary termination
homopolymer
isotactic dan
2. Coloring agents that do not dissolve into the polymer
gauche conformation
asymetric
blends
pigments
3. Primary raw material for most polymers
nylon
conformation
pigments
petroleum
4. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
High volume thermoplastics HVTP
oligomers
constitution
gauche conformation
5. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
trans - conformation
screen pack
High volume thermoplastics HVTP
6. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
mutual termination
rayon
thermosets
secondary bonding
7. 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
polyamides
vulcanization
initiation
block copolymers
8. Softening agents
homopolymer
plasticizers
polyviyl chloride PVC
step- growth/condensation polymerization
9. Conformation in which the largest substituents are offset by 180
tacticity
trans - conformation
alternating copolymers
plasticizers
10. 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
branching
pigments
functional groups
structural unit
11. Low- molecular- weight building blocks repeated in the polymer chain
side groups/ substituents
monomers
addition polymerization/chain growth/free- radical polymerization
plasticizers
12. First step in the process of polymerization - during which a free radical is formed
trans - conformation
plasticizers
initiation
die
13. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
relative molecular mass RMM
quenching
weight average molecular weight Mw
eclipsed conformation/ cis - conformation
14. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
thermoplastics
nylon
cracking
functionality
15. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
fillers
blends
polymers
16. 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
eclipsed conformation/ cis - conformation
polyesters
staggered conformation
relative molecular mass RMM
17. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
melt spinning
secondary bonding
aramid
18. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
die
extruder
termination
dyes
19. One type of polymer that contains at least 85% of polyacrylonitrile PAN
oligomers
acrylic
free radical
die
20. 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
melt spinning
constitution
solution spinning
condensation/step- growth polymerization
21. 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
plasticizers
primary termination
functional groups
trans - conformation
22. Additives whose primary purpose is to reduce the final cost of the product
fillers
stabilizers
plasticizers
secondary bonding
23. 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
polypphenylene terephyhalamide PPTA
propagation
primary termination
weight average molecular weight Mw
24. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
coloring agents
acrylic
vulcanization
aramid
25. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
blends
quenching
die
26. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
functional groups
injection molding
polymer backbone
thermosets
27. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
functional groups
freeze line
graft copolymers
polyviyl chloride PVC
28. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
nylon
isotactic dan
condensation/step- growth polymerization
additives
29. An acid and an alcohol
polypphenylene terephyhalamide PPTA
most common condensation/step- growth polymerization occur between....
number average molecular weight Mn
polymers
30. Covalent bonding of the polymer backbone and side groups
constitution
primary bonding
glass transition temperature Tg
condensation/step- growth polymerization
31. 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
blends
mutual termination
melt spinning
die
32. Conformation that occurs when the largest substituent in a molecule are offset by 60
monomers
gauche conformation
glass transition temperature Tg
any carbon with double bonds or repeated substituents
33. Molecule containing a highly reactive unpaired electron
initiation
gauche conformation
secondary bonding
free radical
34. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
end groups
termination
spinneret
cracking
35. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
rayon
weight average molecular weight Mw
blends
injection molding
36. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
gauche conformation
vinyl monomer
additives
screen pack
37. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
mutual termination
staggered conformation
primary bonding
38. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
cracking
atactic
aramid
propagation
39. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
dyes
secondary bonding
plasticizers
quenching
40. 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
stabilizers
additives
mutual termination
aramid
41. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
dyes
free radical
constitution
plasticizers
42. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
stabilizers
functional groups
polyamides
tacticity
43. Arrangement of the largest substituents where the substituets are offset by 120
secondary bonding
staggered conformation
atactic
relative molecular mass RMM
44. Double bounded organic molecule used to begin addition polymerization
High volume thermoplastics HVTP
additives
functionality
vinyl monomer
45. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
dyes
termination
relative molecular mass RMM
eclipsed conformation/ cis - conformation
46. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
viscose process
aramid
conformation
47. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
constitution
thermosets
poly- p- phenylene benzobisoxazole PBO
end groups
48. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
random copolymers
melt spinning
polyesters
49. Number of bonds a molecule has formed
plasticizers
functionality
graft copolymers
random copolymers
50. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
branching
barrel
alternating copolymers
atactic