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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. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
spinneret
atactic
polymer backbone
copolymer
2. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
free radical
petroleum
secondary bonding
structural unit
3. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible
block copolymers
side groups/ substituents
glass transition temperature Tg
graft copolymers
4. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
configuration
side groups/ substituents
thermoplastics
pigments
5. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
random copolymers
poly- p- phenylene benzobisoxazole PBO
thermosets
6. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
stabilizers
glass transition temperature Tg
copolymer
7. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
degree of polymerization DPn
vulcanization
graft copolymers
primary termination
8. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
viscose process
nylon
propagation
9. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
primary bonding
polyesters
copolymer
10. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
homopolymer
propagation
termination
11. Simple polymeric material produced as pellets in large quantities
polyurethanes
structural unit
High volume thermoplastics HVTP
dyes
12. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
number average molecular weight Mn
copolymer
end groups
13. Arrangement of the largest substituents where the substituets are offset by 120
isotactic dan
oligomers
High volume thermoplastics HVTP
staggered conformation
14. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
dyes
polyamides
mutual termination
alternating copolymers
15. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
vulcanization
die
constitution
propagation
16. 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
weight average molecular weight Mw
acrylic
staggered conformation
nylon
17. Relative configuration of adjecent asymmetric carbons
eclipsed conformation/ cis - conformation
condensation/step- growth polymerization
plyacrylonitrile PAN
tacticity
18. 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
eclipsed conformation/ cis - conformation
petroleum
number average molecular weight Mn
thermoplastics
19. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
polyviyl chloride PVC
acrylic
poly- p- phenylene benzobisoxazole PBO
dyes
20. 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
rayon
dyes
die
polyamides
21. 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
trans - conformation
extruder
block copolymers
any carbon with double bonds or repeated substituents
22. 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
syndiotactic dyad
degree of polymerization DPn
end groups
solution spinning
23. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
condensation/step- growth polymerization
structural unit
any carbon with double bonds or repeated substituents
elastomers
24. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
plasticizers
injection molding
glass transition temperature Tg
vulcanization
25. Covalent bonding of the polymer backbone and side groups
polymers
mutual termination
primary bonding
secondary bonding
26. 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
syndiotactic dyad
atactic
polymethylmethacrylate PMMA
27. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
shot size
copolymer
configuration
functionality
28. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
viscose process
polyurethanes
block copolymers
29. Polymers that contain amide (- N-) groups in the chain
rayon
polyamides
coloring agents
blends
30. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water
solution spinning
petroleum
screen pack
step- growth/condensation polymerization
31. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
free radical
weight average molecular weight Mw
addition polymerization/chain growth/free- radical polymerization
32. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
propagation
structural unit
constitution
injection molding
33. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
rayon
plasticizers
addition polymerization/chain growth/free- radical polymerization
blends
34. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polypphenylene terephyhalamide PPTA
block copolymers
conformation
eclipsed conformation/ cis - conformation
35. Carbon atom capable of multiple configurations due to four different substituents
gauche conformation
polypphenylene terephyhalamide PPTA
asymetric
configuration
36. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
syndiotactic dyad
functionality
quenching
polymers
37. Pigments or dyes that change the way light is absorbed or reflected by a polymer
screen pack
coloring agents
poly- p- phenylene benzobisoxazole PBO
tow
38. Primary raw material for most polymers
plasticizers
initiation
vulcanization
petroleum
39. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
syndiotactic dyad
barrel
polyviyl chloride PVC
High volume thermoplastics HVTP
40. Polymer made up of two of more differenet monomers covalently bonded together
pigments
graft copolymers
petroleum
copolymer
41. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
step- growth/condensation polymerization
end groups
staggered conformation
additives
42. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
constitution
additives
plyacrylonitrile PAN
alternating copolymers
43. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
constitution
addition polymerization/chain growth/free- radical polymerization
polyviyl chloride PVC
polypphenylene terephyhalamide PPTA
44. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
homopolymer
hopper
dyes
thermoplastics
45. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
blends
graft copolymers
solution spinning
random copolymers
46. Porcess of breaking large organic hydrocarbons into smaller molecules
thermosets
coloring agents
cracking
primary bonding
47. Low- molecular- weight building blocks repeated in the polymer chain
functionality
polypphenylene terephyhalamide PPTA
monomers
polyviyl chloride PVC
48. Molecule containing a highly reactive unpaired electron
quenching
elastomers
free radical
polyamides
49. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
hopper
most common condensation/step- growth polymerization occur between....
High volume thermoplastics HVTP
syndiotactic dyad
50. Conformation in which the largest substituents are offset by 180
viscose process
propagation
freeze line
trans - conformation