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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. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
pigments
end groups
thermoplastics
polymer backbone
2. Pigments or dyes that change the way light is absorbed or reflected by a polymer
conformation
melt spinning
coloring agents
elastomers
3. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
freeze line
additives
tow
graft copolymers
4. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
polyamides
graft copolymers
High volume thermoplastics HVTP
gauche conformation
5. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
plasticizers
constitution
fillers
syndiotactic dyad
6. 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
propagation
barrel
melt spinning
number average molecular weight Mn
7. 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
polymethylmethacrylate PMMA
glass transition temperature Tg
poly- p- phenylene benzobisoxazole PBO
aramid
8. Low- molecular- weight building blocks repeated in the polymer chain
most common condensation/step- growth polymerization occur between....
conformation
monomers
tacticity
9. 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
coloring agents
polyesters
random copolymers
10. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
plasticizers
High volume thermoplastics HVTP
number average molecular weight Mn
injection molding
11. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
number average molecular weight Mn
High volume thermoplastics HVTP
plasticizers
12. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
tow
petroleum
High volume thermoplastics HVTP
13. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polyesters
polyamides
conformation
staggered conformation
14. 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
asymetric
die
structural unit
blends
15. Primary raw material for most polymers
polyamides
petroleum
branching
oligomers
16. 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
polyesters
coloring agents
poly- p- phenylene benzobisoxazole PBO
solution spinning
17. Carbon atom capable of multiple configurations due to four different substituents
screen pack
relative molecular mass RMM
asymetric
poly- p- phenylene benzobisoxazole PBO
18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
oligomers
petroleum
stabilizers
configuration
19. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
termination
plasticizers
any carbon with double bonds or repeated substituents
20. 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
number average molecular weight Mn
blends
relative molecular mass RMM
branching
21. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
barrel
vulcanization
polyviyl chloride PVC
eclipsed conformation/ cis - conformation
22. Two or more polymers mechanically mixed together but without covalent bonding between them
side groups/ substituents
plasticizers
vulcanization
blends
23. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
number average molecular weight Mn
step- growth/condensation polymerization
elastomers
hopper
24. Double bounded organic molecule used to begin addition polymerization
branching
vinyl monomer
cracking
thermoplastics
25. 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
syndiotactic dyad
solution spinning
polymer backbone
block copolymers
26. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
polyurethanes
polymer backbone
acrylic
27. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
configuration
any carbon with double bonds or repeated substituents
High volume thermoplastics HVTP
28. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
stabilizers
free radical
additives
29. Simple polymeric material produced as pellets in large quantities
functionality
trans - conformation
isotactic dan
High volume thermoplastics HVTP
30. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
step- growth/condensation polymerization
additives
propagation
number average molecular weight Mn
31. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
propagation
additives
polyurethanes
32. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
barrel
acrylic
additives
shot size
33. Relative configuration of adjecent asymmetric carbons
primary bonding
tacticity
primary termination
end groups
34. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
end groups
hopper
degree of polymerization DPn
35. Is not asymetric and cannot have multiple configurations
alternating copolymers
termination
vinyl monomer
any carbon with double bonds or repeated substituents
36. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
solution spinning
High volume thermoplastics HVTP
extruder
thermosets
37. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
alternating copolymers
number average molecular weight Mn
end groups
38. 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
branching
cracking
quenching
structural unit
39. Molecule containing a highly reactive unpaired electron
isotactic dan
secondary bonding
monomers
free radical
40. Smallest repeating unit in a polymer. aka repeat unit
polymer backbone
structural unit
aramid
polyamides
41. Arrangement of the largest substituents where the substituets are offset by 120
aramid
most common condensation/step- growth polymerization occur between....
staggered conformation
propagation
42. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
constitution
screen pack
petroleum
coloring agents
43. Number of repeat/structural units in a polymer chain
shot size
vulcanization
degree of polymerization DPn
mutual termination
44. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
plyacrylonitrile PAN
die
end groups
polyamides
45. Broad category of polymers that includes polymers containing urethane linkages
dyes
High volume thermoplastics HVTP
polyurethanes
eclipsed conformation/ cis - conformation
46. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
vinyl monomer
addition polymerization/chain growth/free- radical polymerization
pigments
number average molecular weight Mn
47. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
relative molecular mass RMM
spinneret
primary termination
monomers
48. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
tow
primary termination
functional groups
solution spinning
49. Conformation that occurs when the largest substituent in a molecule are offset by 60
atactic
gauche conformation
solution spinning
nylon
50. Softening agents
asymetric
nylon
plasticizers
atactic