SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. 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
primary bonding
spinneret
elastomers
isotactic dan
2. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
coloring agents
free radical
elastomers
3. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
gauche conformation
extruder
degree of polymerization DPn
number average molecular weight Mn
4. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
blends
polyesters
shot size
propagation
5. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
vinyl monomer
aramid
atactic
polymer backbone
6. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
coloring agents
termination
gauche conformation
7. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
primary termination
addition polymerization/chain growth/free- radical polymerization
tow
atactic
8. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
asymetric
plasticizers
thermosets
side groups/ substituents
9. Conformation that occurs when the largest substituent in a molecule are offset by 60
termination
gauche conformation
pigments
acrylic
10. Arrangement of the largest substituents where the substituets are offset by 120
tow
polymer backbone
block copolymers
staggered conformation
11. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
tacticity
plyacrylonitrile PAN
constitution
degree of polymerization DPn
12. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
spinneret
end groups
relative molecular mass RMM
aramid
13. Polymers that contain amide (- N-) groups in the chain
fillers
polymers
polyamides
vulcanization
14. One type of polymer that contains at least 85% of polyacrylonitrile PAN
number average molecular weight Mn
acrylic
blends
functional groups
15. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
side groups/ substituents
addition polymerization/chain growth/free- radical polymerization
functional groups
relative molecular mass RMM
16. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polyurethanes
polymethylmethacrylate PMMA
oligomers
staggered conformation
17. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
structural unit
tow
hopper
dyes
18. Additives whose primary purpose is to reduce the final cost of the product
fillers
glass transition temperature Tg
aramid
conformation
19. 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
copolymer
constitution
relative molecular mass RMM
polymethylmethacrylate PMMA
20. Softening agents
pigments
nylon
alternating copolymers
plasticizers
21. Polymer that is made up a single repeat unit
homopolymer
injection molding
rayon
isotactic dan
22. 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
staggered conformation
screen pack
step- growth/condensation polymerization
vinyl monomer
23. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polymethylmethacrylate PMMA
vinyl monomer
polypphenylene terephyhalamide PPTA
viscose process
24. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
graft copolymers
syndiotactic dyad
petroleum
thermosets
25. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
vulcanization
aramid
gauche conformation
nylon
26. 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
solution spinning
glass transition temperature Tg
viscose process
27. Conformation in which the largest substituents are offset by 180
vinyl monomer
syndiotactic dyad
trans - conformation
any carbon with double bonds or repeated substituents
28. Is not asymetric and cannot have multiple configurations
termination
any carbon with double bonds or repeated substituents
spinneret
petroleum
29. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
any carbon with double bonds or repeated substituents
syndiotactic dyad
propagation
polyamides
30. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
plyacrylonitrile PAN
elastomers
staggered conformation
structural unit
31. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
configuration
stabilizers
mutual termination
screen pack
32. Covalently bonded chains of molecules with small monomer units repeated from end to end
viscose process
stabilizers
atactic
polymers
33. 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
trans - conformation
condensation/step- growth polymerization
monomers
shot size
34. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
termination
fillers
rayon
graft copolymers
35. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
condensation/step- growth polymerization
thermoplastics
syndiotactic dyad
vulcanization
36. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
alternating copolymers
dyes
homopolymer
end groups
37. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
High volume thermoplastics HVTP
rayon
most common condensation/step- growth polymerization occur between....
monomers
38. Covalent bonding of the polymer backbone and side groups
monomers
injection molding
any carbon with double bonds or repeated substituents
primary bonding
39. Number of bonds a molecule has formed
functionality
vulcanization
polyurethanes
configuration
40. First step in the process of polymerization - during which a free radical is formed
polypphenylene terephyhalamide PPTA
blends
initiation
solution spinning
41. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
configuration
primary termination
polymers
42. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
plyacrylonitrile PAN
alternating copolymers
staggered conformation
injection molding
43. 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
plasticizers
eclipsed conformation/ cis - conformation
barrel
elastomers
44. Carbon atom capable of multiple configurations due to four different substituents
termination
gauche conformation
asymetric
quenching
45. Simple polymeric material produced as pellets in large quantities
dyes
end groups
High volume thermoplastics HVTP
secondary bonding
46. Atoms attached to the polymer backbone.
branching
side groups/ substituents
screen pack
polyviyl chloride PVC
47. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
block copolymers
isotactic dan
free radical
48. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
random copolymers
plyacrylonitrile PAN
free radical
degree of polymerization DPn
49. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
structural unit
spinneret
aramid
glass transition temperature Tg
50. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process
die
mutual termination
degree of polymerization DPn
termination