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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. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
most common condensation/step- growth polymerization occur between....
aramid
tacticity
2. Simple polymeric material produced as pellets in large quantities
barrel
poly- p- phenylene benzobisoxazole PBO
plasticizers
High volume thermoplastics HVTP
3. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
functional groups
polyesters
hopper
High volume thermoplastics HVTP
4. First step in the process of polymerization - during which a free radical is formed
copolymer
hopper
initiation
mutual termination
5. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
shot size
addition polymerization/chain growth/free- radical polymerization
polypphenylene terephyhalamide PPTA
monomers
6. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
polymethylmethacrylate PMMA
secondary bonding
barrel
7. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
plasticizers
alternating copolymers
nylon
blends
8. Conformation in which the largest substituents are offset by 180
primary termination
viscose process
polyamides
trans - conformation
9. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
plasticizers
homopolymer
vulcanization
mutual termination
10. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
freeze line
copolymer
viscose process
addition polymerization/chain growth/free- radical polymerization
11. Conformation that occurs when the largest substituent in a molecule are offset by 60
aramid
gauche conformation
polymethylmethacrylate PMMA
number average molecular weight Mn
12. 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
polypphenylene terephyhalamide PPTA
side groups/ substituents
polyviyl chloride PVC
13. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
extruder
nylon
branching
end groups
14. Is not asymetric and cannot have multiple configurations
solution spinning
plasticizers
any carbon with double bonds or repeated substituents
polymer backbone
15. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
step- growth/condensation polymerization
die
vinyl monomer
poly- p- phenylene benzobisoxazole PBO
16. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
propagation
staggered conformation
relative molecular mass RMM
17. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
elastomers
stabilizers
tacticity
monomers
18. 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
thermoplastics
constitution
relative molecular mass RMM
poly- p- phenylene benzobisoxazole PBO
19. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
die
monomers
secondary bonding
relative molecular mass RMM
20. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
asymetric
propagation
injection molding
21. Molecule containing a highly reactive unpaired electron
random copolymers
block copolymers
hopper
free radical
22. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
additives
end groups
constitution
coloring agents
23. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
isotactic dan
fillers
eclipsed conformation/ cis - conformation
vulcanization
24. 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
staggered conformation
functional groups
acrylic
25. Number of repeat/structural units in a polymer chain
any carbon with double bonds or repeated substituents
degree of polymerization DPn
injection molding
thermoplastics
26. Primary raw material for most polymers
oligomers
alternating copolymers
petroleum
aramid
27. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
oligomers
vinyl monomer
plasticizers
28. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
coloring agents
barrel
initiation
quenching
29. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
free radical
block copolymers
viscose process
spinneret
30. 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
block copolymers
free radical
glass transition temperature Tg
oligomers
31. Polymers that contain amide (- N-) groups in the chain
polyamides
any carbon with double bonds or repeated substituents
melt spinning
functional groups
32. 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
asymetric
blends
polyesters
cracking
33. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
configuration
polymethylmethacrylate PMMA
polyesters
conformation
34. An acid and an alcohol
gauche conformation
any carbon with double bonds or repeated substituents
most common condensation/step- growth polymerization occur between....
tacticity
35. Polymer that is made up a single repeat unit
homopolymer
tow
tacticity
propagation
36. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
blends
configuration
hopper
isotactic dan
37. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
monomers
screen pack
oligomers
vulcanization
38. 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
melt spinning
end groups
step- growth/condensation polymerization
isotactic dan
39. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
staggered conformation
polymer backbone
plyacrylonitrile PAN
quenching
40. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
aramid
shot size
staggered conformation
dyes
41. Softening agents
most common condensation/step- growth polymerization occur between....
tow
plasticizers
relative molecular mass RMM
42. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
syndiotactic dyad
tow
extruder
43. Polymer made up of two of more differenet monomers covalently bonded together
conformation
any carbon with double bonds or repeated substituents
copolymer
secondary bonding
44. 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
weight average molecular weight Mw
die
monomers
side groups/ substituents
45. 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
number average molecular weight Mn
thermosets
46. Number of bonds a molecule has formed
structural unit
step- growth/condensation polymerization
functionality
nylon
47. 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
polyesters
polyviyl chloride PVC
condensation/step- growth polymerization
quenching
48. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
screen pack
condensation/step- growth polymerization
blends
49. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
polyesters
isotactic dan
polypphenylene terephyhalamide PPTA
extruder
50. Additives whose primary purpose is to reduce the final cost of the product
eclipsed conformation/ cis - conformation
any carbon with double bonds or repeated substituents
fillers
alternating copolymers