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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. 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
polyurethanes
injection molding
thermoplastics
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
die
step- growth/condensation polymerization
glass transition temperature Tg
mutual termination
3. Softening agents
acrylic
syndiotactic dyad
plasticizers
vinyl monomer
4. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
shot size
degree of polymerization DPn
elastomers
quenching
5. 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
configuration
elastomers
isotactic dan
plasticizers
6. 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
tacticity
solution spinning
die
polyesters
7. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
die
functional groups
degree of polymerization DPn
eclipsed conformation/ cis - conformation
8. 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
polymer backbone
block copolymers
plasticizers
monomers
9. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
melt spinning
elastomers
additives
tow
10. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
weight average molecular weight Mw
quenching
dyes
graft copolymers
11. 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
dyes
primary termination
branching
polyamides
12. Polymer that is made up a single repeat unit
quenching
degree of polymerization DPn
viscose process
homopolymer
13. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
trans - conformation
copolymer
graft copolymers
plasticizers
14. 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
oligomers
thermoplastics
weight average molecular weight Mw
die
15. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
spinneret
poly- p- phenylene benzobisoxazole PBO
conformation
16. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
any carbon with double bonds or repeated substituents
High volume thermoplastics HVTP
eclipsed conformation/ cis - conformation
17. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
random copolymers
polyurethanes
spinneret
plyacrylonitrile PAN
18. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polyviyl chloride PVC
free radical
constitution
dyes
19. Simple polymeric material produced as pellets in large quantities
plasticizers
eclipsed conformation/ cis - conformation
High volume thermoplastics HVTP
primary termination
20. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
primary termination
polyamides
any carbon with double bonds or repeated substituents
21. Polymer made up of two of more differenet monomers covalently bonded together
functional groups
injection molding
addition polymerization/chain growth/free- radical polymerization
copolymer
22. Is not asymetric and cannot have multiple configurations
condensation/step- growth polymerization
High volume thermoplastics HVTP
any carbon with double bonds or repeated substituents
polyamides
23. An acid and an alcohol
barrel
most common condensation/step- growth polymerization occur between....
primary termination
trans - conformation
24. Conformation in which the largest substituents are offset by 180
plasticizers
trans - conformation
graft copolymers
condensation/step- growth polymerization
25. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
pigments
cracking
polyviyl chloride PVC
spinneret
26. Arrangement of the largest substituents where the substituets are offset by 120
thermosets
staggered conformation
elastomers
primary bonding
27. First step in the process of polymerization - during which a free radical is formed
condensation/step- growth polymerization
petroleum
initiation
most common condensation/step- growth polymerization occur between....
28. Additives whose primary purpose is to reduce the final cost of the product
mutual termination
functionality
elastomers
fillers
29. Covalently bonded chains of molecules with small monomer units repeated from end to end
polyurethanes
polymers
coloring agents
elastomers
30. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
extruder
atactic
vinyl monomer
polyviyl chloride PVC
31. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
primary termination
hopper
aramid
stabilizers
32. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
vulcanization
cracking
die
viscose process
33. Coloring agents that do not dissolve into the polymer
pigments
stabilizers
coloring agents
isotactic dan
34. Carbon atom capable of multiple configurations due to four different substituents
primary termination
staggered conformation
asymetric
eclipsed conformation/ cis - conformation
35. Primary raw material for most polymers
petroleum
polypphenylene terephyhalamide PPTA
primary termination
polyamides
36. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
graft copolymers
petroleum
random copolymers
melt spinning
37. Polymers that contain amide (- N-) groups in the chain
primary termination
polyamides
quenching
trans - conformation
38. Low- molecular- weight building blocks repeated in the polymer chain
monomers
secondary bonding
atactic
most common condensation/step- growth polymerization occur between....
39. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
termination
graft copolymers
die
extruder
40. Two or more polymers mechanically mixed together but without covalent bonding between them
random copolymers
blends
polyviyl chloride PVC
syndiotactic dyad
41. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
cracking
most common condensation/step- growth polymerization occur between....
additives
42. Number of bonds a molecule has formed
alternating copolymers
functionality
degree of polymerization DPn
coloring agents
43. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
solution spinning
syndiotactic dyad
polyesters
44. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
acrylic
coloring agents
extruder
45. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
melt spinning
glass transition temperature Tg
petroleum
46. Double bounded organic molecule used to begin addition polymerization
elastomers
weight average molecular weight Mw
copolymer
vinyl monomer
47. Pigments or dyes that change the way light is absorbed or reflected by a polymer
side groups/ substituents
polymers
pigments
coloring agents
48. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
petroleum
poly- p- phenylene benzobisoxazole PBO
dyes
49. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
structural unit
vulcanization
cracking
glass transition temperature Tg
50. 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
barrel
end groups
screen pack
weight average molecular weight Mw