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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 chains of molecules with small monomer units repeated from end to end
blends
staggered conformation
degree of polymerization DPn
polymers
2. Broad category of polymers that includes polymers containing urethane linkages
conformation
quenching
polyurethanes
monomers
3. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
conformation
cracking
random copolymers
fillers
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
thermoplastics
tacticity
additives
syndiotactic dyad
5. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
acrylic
secondary bonding
degree of polymerization DPn
extruder
6. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
die
polypphenylene terephyhalamide PPTA
eclipsed conformation/ cis - conformation
injection molding
7. Number of repeat/structural units in a polymer chain
plasticizers
degree of polymerization DPn
aramid
rayon
8. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
tow
alternating copolymers
plyacrylonitrile PAN
glass transition temperature Tg
9. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
weight average molecular weight Mw
branching
polymethylmethacrylate PMMA
polypphenylene terephyhalamide PPTA
10. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
additives
monomers
termination
11. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
initiation
shot size
thermosets
12. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
staggered conformation
polyviyl chloride PVC
plasticizers
freeze line
13. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
asymetric
polyviyl chloride PVC
branching
block copolymers
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
constitution
polymers
die
nylon
15. Double bounded organic molecule used to begin addition polymerization
tacticity
barrel
vinyl monomer
pigments
16. Relative configuration of adjecent asymmetric carbons
vinyl monomer
addition polymerization/chain growth/free- radical polymerization
plasticizers
tacticity
17. 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
barrel
atactic
constitution
secondary bonding
18. 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
gauche conformation
step- growth/condensation polymerization
shot size
viscose process
19. Molecule containing a highly reactive unpaired electron
syndiotactic dyad
free radical
cracking
polymers
20. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
structural unit
constitution
homopolymer
21. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
plyacrylonitrile PAN
vulcanization
weight average molecular weight Mw
22. 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
solution spinning
spinneret
stabilizers
23. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
number average molecular weight Mn
polymers
conformation
block copolymers
24. 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
plasticizers
block copolymers
trans - conformation
polyamides
25. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
vulcanization
blends
configuration
plyacrylonitrile PAN
26. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
addition polymerization/chain growth/free- radical polymerization
shot size
extruder
27. Polymer made up of two of more differenet monomers covalently bonded together
stabilizers
tow
copolymer
branching
28. 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
alternating copolymers
fillers
end groups
29. Coloring agents that do not dissolve into the polymer
branching
additives
polyviyl chloride PVC
pigments
30. One type of polymer that contains at least 85% of polyacrylonitrile PAN
tacticity
vinyl monomer
acrylic
polyamides
31. Pigments or dyes that change the way light is absorbed or reflected by a polymer
graft copolymers
functional groups
addition polymerization/chain growth/free- radical polymerization
coloring agents
32. 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
condensation/step- growth polymerization
plyacrylonitrile PAN
hopper
eclipsed conformation/ cis - conformation
33. Polymers that contain amide (- N-) groups in the chain
primary termination
viscose process
polypphenylene terephyhalamide PPTA
polyamides
34. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
any carbon with double bonds or repeated substituents
constitution
plasticizers
functionality
35. 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
hopper
polyesters
thermoplastics
poly- p- phenylene benzobisoxazole PBO
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
weight average molecular weight Mw
acrylic
thermoplastics
branching
37. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
structural unit
secondary bonding
coloring agents
38. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
gauche conformation
hopper
melt spinning
39. Softening agents
plasticizers
dyes
homopolymer
thermosets
40. Arrangement of the largest substituents where the substituets are offset by 120
addition polymerization/chain growth/free- radical polymerization
propagation
staggered conformation
primary termination
41. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
termination
graft copolymers
mutual termination
random copolymers
42. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
trans - conformation
polyamides
freeze line
hopper
43. 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
isotactic dan
functionality
degree of polymerization DPn
dyes
44. Conformation in which the largest substituents are offset by 180
pigments
weight average molecular weight Mw
primary bonding
trans - conformation
45. Is not asymetric and cannot have multiple configurations
polyviyl chloride PVC
branching
shot size
any carbon with double bonds or repeated substituents
46. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
conformation
condensation/step- growth polymerization
quenching
random copolymers
47. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
thermoplastics
stabilizers
High volume thermoplastics HVTP
48. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
functional groups
petroleum
stabilizers
elastomers
49. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
asymetric
viscose process
isotactic dan
initiation
50. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
end groups
random copolymers
homopolymer
configuration