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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. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
hopper
polypphenylene terephyhalamide PPTA
block copolymers
additives
2. One type of polymer that contains at least 85% of polyacrylonitrile PAN
blends
primary bonding
acrylic
isotactic dan
3. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
constitution
atactic
primary bonding
aramid
4. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
polyviyl chloride PVC
stabilizers
relative molecular mass RMM
syndiotactic dyad
5. 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
functional groups
melt spinning
polyviyl chloride PVC
plyacrylonitrile PAN
6. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polyviyl chloride PVC
configuration
additives
any carbon with double bonds or repeated substituents
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
propagation
conformation
solution spinning
weight average molecular weight Mw
8. Pigments or dyes that change the way light is absorbed or reflected by a polymer
propagation
coloring agents
vulcanization
extruder
9. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
polymers
polypphenylene terephyhalamide PPTA
plyacrylonitrile PAN
10. Relative configuration of adjecent asymmetric carbons
glass transition temperature Tg
conformation
tacticity
tow
11. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
configuration
cracking
initiation
primary termination
12. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polyviyl chloride PVC
propagation
configuration
quenching
13. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
plasticizers
gauche conformation
shot size
14. Polymers that contain amide (- N-) groups in the chain
polymers
die
polyamides
extruder
15. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
rayon
number average molecular weight Mn
initiation
conformation
16. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
screen pack
elastomers
plasticizers
nylon
17. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
plyacrylonitrile PAN
eclipsed conformation/ cis - conformation
blends
18. Softening agents
plasticizers
asymetric
gauche conformation
stabilizers
19. Atoms attached to the polymer backbone.
side groups/ substituents
barrel
termination
fillers
20. 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
step- growth/condensation polymerization
High volume thermoplastics HVTP
oligomers
shot size
21. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
copolymer
acrylic
solution spinning
22. 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
blends
extruder
High volume thermoplastics HVTP
block copolymers
23. 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
degree of polymerization DPn
polymethylmethacrylate PMMA
barrel
configuration
24. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
barrel
mutual termination
propagation
termination
25. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
blends
hopper
asymetric
conformation
26. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
polymer backbone
addition polymerization/chain growth/free- radical polymerization
polypphenylene terephyhalamide PPTA
shot size
27. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
extruder
thermoplastics
elastomers
random copolymers
28. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
most common condensation/step- growth polymerization occur between....
glass transition temperature Tg
elastomers
29. 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
barrel
plasticizers
eclipsed conformation/ cis - conformation
die
30. 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
conformation
relative molecular mass RMM
copolymer
die
31. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
block copolymers
syndiotactic dyad
primary termination
polyviyl chloride PVC
32. Broad category of polymers that includes polymers containing urethane linkages
glass transition temperature Tg
polyurethanes
atactic
plyacrylonitrile PAN
33. 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
relative molecular mass RMM
syndiotactic dyad
branching
polyviyl chloride PVC
34. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
polypphenylene terephyhalamide PPTA
random copolymers
syndiotactic dyad
35. Carbon atom capable of multiple configurations due to four different substituents
polyviyl chloride PVC
propagation
screen pack
asymetric
36. 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
die
free radical
polymethylmethacrylate PMMA
plasticizers
37. 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
any carbon with double bonds or repeated substituents
blends
vulcanization
condensation/step- growth polymerization
38. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
end groups
tow
tacticity
39. Additives whose primary purpose is to reduce the final cost of the product
functional groups
fillers
alternating copolymers
hopper
40. Simple polymeric material produced as pellets in large quantities
poly- p- phenylene benzobisoxazole PBO
High volume thermoplastics HVTP
quenching
number average molecular weight Mn
41. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
gauche conformation
fillers
shot size
42. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
monomers
secondary bonding
quenching
43. 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
glass transition temperature Tg
thermosets
quenching
vulcanization
44. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
functionality
propagation
tow
structural unit
45. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
number average molecular weight Mn
polyurethanes
oligomers
46. 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
number average molecular weight Mn
weight average molecular weight Mw
most common condensation/step- growth polymerization occur between....
relative molecular mass RMM
47. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
monomers
shot size
random copolymers
degree of polymerization DPn
48. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
eclipsed conformation/ cis - conformation
polyurethanes
rayon
viscose process
49. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
condensation/step- growth polymerization
injection molding
vulcanization
thermoplastics
50. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
termination
atactic
acrylic