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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. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
primary termination
primary bonding
configuration
tow
2. 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
extruder
step- growth/condensation polymerization
rayon
barrel
3. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
glass transition temperature Tg
screen pack
any carbon with double bonds or repeated substituents
termination
4. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
barrel
any carbon with double bonds or repeated substituents
mutual termination
viscose process
5. Porcess of breaking large organic hydrocarbons into smaller molecules
constitution
fillers
die
cracking
6. Double bounded organic molecule used to begin addition polymerization
plasticizers
vinyl monomer
gauche conformation
thermosets
7. Low- molecular- weight building blocks repeated in the polymer chain
functional groups
petroleum
monomers
additives
8. 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
functional groups
petroleum
stabilizers
solution spinning
9. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
blends
melt spinning
vulcanization
syndiotactic dyad
10. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
poly- p- phenylene benzobisoxazole PBO
syndiotactic dyad
die
11. 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
melt spinning
die
eclipsed conformation/ cis - conformation
polypphenylene terephyhalamide PPTA
12. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
staggered conformation
die
polymers
random copolymers
13. 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
side groups/ substituents
block copolymers
step- growth/condensation polymerization
vinyl monomer
14. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
aramid
constitution
dyes
15. 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
functional groups
relative molecular mass RMM
any carbon with double bonds or repeated substituents
weight average molecular weight Mw
16. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
vinyl monomer
conformation
poly- p- phenylene benzobisoxazole PBO
addition polymerization/chain growth/free- radical polymerization
17. Molecule containing a highly reactive unpaired electron
functionality
free radical
alternating copolymers
tow
18. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
coloring agents
weight average molecular weight Mw
conformation
19. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
glass transition temperature Tg
plasticizers
plyacrylonitrile PAN
20. Two or more polymers mechanically mixed together but without covalent bonding between them
polymer backbone
step- growth/condensation polymerization
blends
plasticizers
21. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
glass transition temperature Tg
polyviyl chloride PVC
blends
nylon
22. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
block copolymers
most common condensation/step- growth polymerization occur between....
eclipsed conformation/ cis - conformation
23. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water
High volume thermoplastics HVTP
cracking
condensation/step- growth polymerization
acrylic
24. Is not asymetric and cannot have multiple configurations
trans - conformation
quenching
glass transition temperature Tg
any carbon with double bonds or repeated substituents
25. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
rayon
isotactic dan
conformation
polymer backbone
26. Carbon atom capable of multiple configurations due to four different substituents
asymetric
polyamides
vinyl monomer
functional groups
27. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
asymetric
staggered conformation
functional groups
melt spinning
28. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
polyurethanes
random copolymers
polyesters
29. 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
asymetric
petroleum
conformation
30. Arrangement of the largest substituents where the substituets are offset by 120
cracking
staggered conformation
melt spinning
atactic
31. Smallest repeating unit in a polymer. aka repeat unit
stabilizers
screen pack
structural unit
extruder
32. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
random copolymers
any carbon with double bonds or repeated substituents
extruder
polymers
33. Softening agents
plasticizers
end groups
degree of polymerization DPn
shot size
34. Polymer made up of two of more differenet monomers covalently bonded together
die
copolymer
plasticizers
aramid
35. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
petroleum
functionality
stabilizers
propagation
36. Pigments or dyes that change the way light is absorbed or reflected by a polymer
solution spinning
polyamides
polypphenylene terephyhalamide PPTA
coloring agents
37. 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
mutual termination
alternating copolymers
quenching
relative molecular mass RMM
38. 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
nylon
polyviyl chloride PVC
gauche conformation
39. Relative configuration of adjecent asymmetric carbons
graft copolymers
blends
tacticity
stabilizers
40. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
secondary bonding
die
initiation
nylon
41. 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
polyesters
gauche conformation
free radical
alternating copolymers
42. 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
petroleum
barrel
relative molecular mass RMM
43. Conformation in which the largest substituents are offset by 180
barrel
trans - conformation
petroleum
secondary bonding
44. 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
termination
poly- p- phenylene benzobisoxazole PBO
block copolymers
functional groups
45. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
addition polymerization/chain growth/free- radical polymerization
step- growth/condensation polymerization
polymer backbone
end groups
46. 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
plasticizers
poly- p- phenylene benzobisoxazole PBO
weight average molecular weight Mw
copolymer
47. Additives whose primary purpose is to reduce the final cost of the product
fillers
melt spinning
secondary bonding
asymetric
48. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
dyes
polyesters
plyacrylonitrile PAN
condensation/step- growth polymerization
49. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
elastomers
polyviyl chloride PVC
thermoplastics
side groups/ substituents
50. 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
constitution
asymetric