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. 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
aramid
relative molecular mass RMM
vinyl monomer
thermoplastics
2. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
end groups
polyesters
cracking
3. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
side groups/ substituents
polypphenylene terephyhalamide PPTA
primary termination
oligomers
4. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
branching
polymers
polyviyl chloride PVC
atactic
5. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
alternating copolymers
structural unit
plasticizers
6. Atoms attached to the polymer backbone.
melt spinning
atactic
number average molecular weight Mn
side groups/ substituents
7. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
screen pack
functional groups
injection molding
shot size
8. 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
blends
end groups
polyesters
constitution
9. 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
configuration
polymers
thermoplastics
10. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
syndiotactic dyad
plasticizers
mutual termination
termination
11. Carbon atom capable of multiple configurations due to four different substituents
asymetric
weight average molecular weight Mw
monomers
coloring agents
12. Polymer that is made up a single repeat unit
dyes
cracking
homopolymer
polyamides
13. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
atactic
end groups
nylon
petroleum
14. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
primary termination
nylon
thermoplastics
syndiotactic dyad
15. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
block copolymers
tow
free radical
rayon
16. 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
most common condensation/step- growth polymerization occur between....
rayon
addition polymerization/chain growth/free- radical polymerization
block copolymers
17. Coloring agents that do not dissolve into the polymer
polypphenylene terephyhalamide PPTA
weight average molecular weight Mw
screen pack
pigments
18. Smallest repeating unit in a polymer. aka repeat unit
solution spinning
structural unit
conformation
isotactic dan
19. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
fillers
primary bonding
eclipsed conformation/ cis - conformation
cracking
20. Double bounded organic molecule used to begin addition polymerization
asymetric
vulcanization
thermoplastics
vinyl monomer
21. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
termination
plasticizers
number average molecular weight Mn
functional groups
22. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
polyurethanes
plasticizers
quenching
23. Molecule containing a highly reactive unpaired electron
free radical
random copolymers
configuration
eclipsed conformation/ cis - conformation
24. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
atactic
graft copolymers
syndiotactic dyad
side groups/ substituents
25. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
mutual termination
vulcanization
primary termination
trans - conformation
26. Additives whose primary purpose is to reduce the final cost of the product
dyes
fillers
branching
polyamides
27. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
gauche conformation
constitution
dyes
28. Covalently bonded chains of molecules with small monomer units repeated from end to end
pigments
coloring agents
polymers
extruder
29. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
addition polymerization/chain growth/free- radical polymerization
isotactic dan
injection molding
polymethylmethacrylate PMMA
30. Arrangement of the largest substituents where the substituets are offset by 120
asymetric
relative molecular mass RMM
staggered conformation
polyviyl chloride PVC
31. 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
polyamides
step- growth/condensation polymerization
alternating copolymers
32. Softening agents
functionality
plasticizers
constitution
eclipsed conformation/ cis - conformation
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
elastomers
freeze line
monomers
condensation/step- growth polymerization
34. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
blends
asymetric
propagation
end groups
35. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polyamides
polymer backbone
configuration
petroleum
36. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
any carbon with double bonds or repeated substituents
polyesters
viscose process
gauche conformation
37. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
isotactic dan
shot size
plyacrylonitrile PAN
dyes
38. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
coloring agents
polymethylmethacrylate PMMA
polymer backbone
aramid
39. 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
initiation
mutual termination
plasticizers
gauche conformation
40. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
injection molding
elastomers
polyurethanes
screen pack
41. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
condensation/step- growth polymerization
conformation
screen pack
dyes
42. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
number average molecular weight Mn
freeze line
screen pack
43. 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
rayon
vulcanization
screen pack
step- growth/condensation polymerization
44. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
extruder
functional groups
gauche conformation
45. 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
solution spinning
oligomers
functional groups
side groups/ substituents
46. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
addition polymerization/chain growth/free- radical polymerization
freeze line
mutual termination
atactic
47. Relative configuration of adjecent asymmetric carbons
tacticity
alternating copolymers
solution spinning
elastomers
48. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
graft copolymers
isotactic dan
end groups
polymers
49. Conformation that occurs when the largest substituent in a molecule are offset by 60
syndiotactic dyad
step- growth/condensation polymerization
configuration
gauche conformation
50. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
primary bonding
trans - conformation
aramid