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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. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
staggered conformation
quenching
polypphenylene terephyhalamide PPTA
2. Polymer that is made up a single repeat unit
relative molecular mass RMM
homopolymer
polymers
cracking
3. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
eclipsed conformation/ cis - conformation
die
copolymer
polyviyl chloride PVC
4. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
vinyl monomer
additives
primary bonding
polyamides
5. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
configuration
polyesters
polypphenylene terephyhalamide PPTA
freeze line
6. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
weight average molecular weight Mw
asymetric
homopolymer
viscose process
7. 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
configuration
vulcanization
solution spinning
number average molecular weight Mn
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
cracking
nylon
end groups
block copolymers
9. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
fillers
eclipsed conformation/ cis - conformation
viscose process
thermosets
10. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
condensation/step- growth polymerization
polyurethanes
end groups
viscose process
11. Softening agents
petroleum
plasticizers
conformation
free radical
12. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
syndiotactic dyad
viscose process
constitution
13. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared
freeze line
most common condensation/step- growth polymerization occur between....
polyesters
number average molecular weight Mn
14. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
plasticizers
vulcanization
extruder
side groups/ substituents
15. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
hopper
rayon
spinneret
branching
16. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
freeze line
alternating copolymers
graft copolymers
functionality
17. Molecule containing a highly reactive unpaired electron
random copolymers
gauche conformation
free radical
end groups
18. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polypphenylene terephyhalamide PPTA
quenching
pigments
plasticizers
19. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
tacticity
copolymer
isotactic dan
20. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
isotactic dan
homopolymer
monomers
conformation
21. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polypphenylene terephyhalamide PPTA
number average molecular weight Mn
petroleum
eclipsed conformation/ cis - conformation
22. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
number average molecular weight Mn
step- growth/condensation polymerization
syndiotactic dyad
secondary bonding
23. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polyesters
block copolymers
hopper
termination
24. Atoms attached to the polymer backbone.
conformation
initiation
side groups/ substituents
poly- p- phenylene benzobisoxazole PBO
25. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
fillers
polypphenylene terephyhalamide PPTA
termination
polymethylmethacrylate PMMA
26. Additives whose primary purpose is to reduce the final cost of the product
relative molecular mass RMM
solution spinning
fillers
functionality
27. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
rayon
any carbon with double bonds or repeated substituents
pigments
28. 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
number average molecular weight Mn
secondary bonding
mutual termination
structural unit
29. 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
extruder
plasticizers
degree of polymerization DPn
stabilizers
30. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
eclipsed conformation/ cis - conformation
pigments
trans - conformation
31. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
High volume thermoplastics HVTP
aramid
poly- p- phenylene benzobisoxazole PBO
end groups
32. First step in the process of polymerization - during which a free radical is formed
blends
block copolymers
addition polymerization/chain growth/free- radical polymerization
initiation
33. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
relative molecular mass RMM
random copolymers
thermoplastics
mutual termination
34. Carbon atom capable of multiple configurations due to four different substituents
viscose process
fillers
rayon
asymetric
35. Arrangement of the largest substituents where the substituets are offset by 120
polyurethanes
homopolymer
degree of polymerization DPn
staggered conformation
36. 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
configuration
weight average molecular weight Mw
cracking
viscose process
37. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
plasticizers
isotactic dan
primary termination
tow
38. Low- molecular- weight building blocks repeated in the polymer chain
monomers
graft copolymers
injection molding
primary termination
39. Conformation that occurs when the largest substituent in a molecule are offset by 60
extruder
gauche conformation
vinyl monomer
degree of polymerization DPn
40. 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
oligomers
step- growth/condensation polymerization
polymer backbone
stabilizers
41. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
step- growth/condensation polymerization
melt spinning
termination
42. 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
polymethylmethacrylate PMMA
functionality
melt spinning
atactic
43. Porcess of breaking large organic hydrocarbons into smaller molecules
poly- p- phenylene benzobisoxazole PBO
cracking
barrel
plyacrylonitrile PAN
44. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
termination
dyes
viscose process
oligomers
45. Polymer made up of two of more differenet monomers covalently bonded together
petroleum
copolymer
any carbon with double bonds or repeated substituents
thermosets
46. Pigments or dyes that change the way light is absorbed or reflected by a polymer
asymetric
constitution
poly- p- phenylene benzobisoxazole PBO
coloring agents
47. 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
alternating copolymers
screen pack
secondary bonding
relative molecular mass RMM
48. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
side groups/ substituents
relative molecular mass RMM
eclipsed conformation/ cis - conformation
49. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
polyamides
syndiotactic dyad
gauche conformation
side groups/ substituents
50. 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
number average molecular weight Mn
isotactic dan
fillers
plyacrylonitrile PAN