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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. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
most common condensation/step- growth polymerization occur between....
polypphenylene terephyhalamide PPTA
polymers
plyacrylonitrile PAN
2. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
syndiotactic dyad
atactic
thermoplastics
3. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
isotactic dan
dyes
thermoplastics
4. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
oligomers
polyamides
relative molecular mass RMM
polymethylmethacrylate PMMA
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
staggered conformation
hopper
melt spinning
spinneret
6. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
die
extruder
rayon
degree of polymerization DPn
7. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
blends
tacticity
nylon
staggered conformation
8. Softening agents
copolymer
gauche conformation
plasticizers
any carbon with double bonds or repeated substituents
9. Molecule containing a highly reactive unpaired electron
polypphenylene terephyhalamide PPTA
free radical
melt spinning
plasticizers
10. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
glass transition temperature Tg
functionality
side groups/ substituents
eclipsed conformation/ cis - conformation
11. Coloring agents that do not dissolve into the polymer
graft copolymers
block copolymers
pigments
isotactic dan
12. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
tow
coloring agents
thermosets
shot size
13. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
termination
syndiotactic dyad
constitution
screen pack
14. Covalent bonding of the polymer backbone and side groups
primary bonding
petroleum
High volume thermoplastics HVTP
side groups/ substituents
15. Number of repeat/structural units in a polymer chain
polyviyl chloride PVC
blends
degree of polymerization DPn
primary bonding
16. Two or more polymers mechanically mixed together but without covalent bonding between them
conformation
hopper
blends
dyes
17. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
melt spinning
functional groups
homopolymer
thermoplastics
18. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
thermoplastics
conformation
nylon
aramid
19. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
monomers
primary bonding
additives
fillers
20. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
primary termination
alternating copolymers
die
pigments
21. 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
block copolymers
polyesters
polyviyl chloride PVC
22. 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
alternating copolymers
injection molding
polyamides
23. Double bounded organic molecule used to begin addition polymerization
thermosets
random copolymers
extruder
vinyl monomer
24. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
tow
pigments
end groups
propagation
25. 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
free radical
nylon
termination
polyesters
26. Relative configuration of adjecent asymmetric carbons
any carbon with double bonds or repeated substituents
conformation
tacticity
alternating copolymers
27. 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
elastomers
graft copolymers
polymer backbone
28. Polymers that contain amide (- N-) groups in the chain
blends
monomers
polyamides
termination
29. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
blends
aramid
structural unit
stabilizers
30. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
free radical
atactic
tacticity
31. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
elastomers
plyacrylonitrile PAN
initiation
32. Broad category of polymers that includes polymers containing urethane linkages
free radical
primary termination
nylon
polyurethanes
33. Number of bonds a molecule has formed
functionality
alternating copolymers
primary bonding
polyurethanes
34. Polymer made up of two of more differenet monomers covalently bonded together
polyesters
polyurethanes
melt spinning
copolymer
35. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
degree of polymerization DPn
monomers
nylon
36. Primary raw material for most polymers
spinneret
petroleum
pigments
most common condensation/step- growth polymerization occur between....
37. Additives whose primary purpose is to reduce the final cost of the product
fillers
thermoplastics
primary termination
constitution
38. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polymer backbone
configuration
aramid
thermosets
39. Conformation in which the largest substituents are offset by 180
vinyl monomer
trans - conformation
homopolymer
spinneret
40. Low- molecular- weight building blocks repeated in the polymer chain
eclipsed conformation/ cis - conformation
primary bonding
monomers
homopolymer
41. 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
block copolymers
initiation
structural unit
primary bonding
42. One type of polymer that contains at least 85% of polyacrylonitrile PAN
plasticizers
blends
injection molding
acrylic
43. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
any carbon with double bonds or repeated substituents
addition polymerization/chain growth/free- radical polymerization
configuration
initiation
44. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polyamides
atactic
elastomers
random copolymers
45. 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
thermoplastics
polyviyl chloride PVC
condensation/step- growth polymerization
block copolymers
46. Pigments or dyes that change the way light is absorbed or reflected by a polymer
plasticizers
coloring agents
isotactic dan
propagation
47. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
blends
dyes
graft copolymers
end groups
48. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
acrylic
polyesters
end groups
49. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
solution spinning
shot size
screen pack
end groups
50. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
cracking
alternating copolymers
polyviyl chloride PVC
stabilizers