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. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
secondary bonding
tow
cracking
end groups
2. Conformation that occurs when the largest substituent in a molecule are offset by 60
cracking
structural unit
gauche conformation
trans - conformation
3. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
asymetric
polyurethanes
hopper
4. Is not asymetric and cannot have multiple configurations
mutual termination
viscose process
any carbon with double bonds or repeated substituents
step- growth/condensation polymerization
5. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
block copolymers
staggered conformation
thermosets
6. Covalent bonding of the polymer backbone and side groups
addition polymerization/chain growth/free- radical polymerization
polymethylmethacrylate PMMA
primary bonding
polyamides
7. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polyviyl chloride PVC
barrel
constitution
aramid
8. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn
melt spinning
free radical
side groups/ substituents
number average molecular weight Mn
9. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
extruder
plasticizers
constitution
nylon
10. Arrangement of the largest substituents where the substituets are offset by 120
block copolymers
isotactic dan
alternating copolymers
staggered conformation
11. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
polyviyl chloride PVC
conformation
plasticizers
12. Number of bonds a molecule has formed
vulcanization
poly- p- phenylene benzobisoxazole PBO
die
functionality
13. Softening agents
plasticizers
blends
freeze line
vinyl monomer
14. 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
trans - conformation
barrel
branching
oligomers
15. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
polyamides
additives
random copolymers
free radical
16. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
blends
nylon
solution spinning
shot size
17. Atoms attached to the polymer backbone.
side groups/ substituents
propagation
oligomers
thermoplastics
18. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
elastomers
initiation
coloring agents
19. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
functional groups
plyacrylonitrile PAN
addition polymerization/chain growth/free- radical polymerization
20. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
oligomers
primary bonding
functionality
21. 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
atactic
polyesters
initiation
addition polymerization/chain growth/free- radical polymerization
22. Polymers that contain amide (- N-) groups in the chain
primary bonding
vinyl monomer
polyamides
quenching
23. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
asymetric
initiation
barrel
polypphenylene terephyhalamide PPTA
24. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
degree of polymerization DPn
polyviyl chloride PVC
plasticizers
atactic
25. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
functional groups
poly- p- phenylene benzobisoxazole PBO
eclipsed conformation/ cis - conformation
end groups
26. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
stabilizers
side groups/ substituents
extruder
27. 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
polymethylmethacrylate PMMA
free radical
branching
polyesters
28. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
polymer backbone
copolymer
polymethylmethacrylate PMMA
stabilizers
29. 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
die
elastomers
solution spinning
block copolymers
30. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
plasticizers
screen pack
number average molecular weight Mn
freeze line
31. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
free radical
quenching
nylon
primary termination
32. Relative configuration of adjecent asymmetric carbons
High volume thermoplastics HVTP
tacticity
side groups/ substituents
spinneret
33. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
spinneret
hopper
propagation
secondary bonding
34. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
relative molecular mass RMM
spinneret
step- growth/condensation polymerization
dyes
35. Number of repeat/structural units in a polymer chain
constitution
weight average molecular weight Mw
degree of polymerization DPn
additives
36. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
cracking
functional groups
pigments
thermoplastics
37. Smallest repeating unit in a polymer. aka repeat unit
constitution
barrel
primary termination
structural unit
38. An acid and an alcohol
polyviyl chloride PVC
primary bonding
most common condensation/step- growth polymerization occur between....
polyurethanes
39. Porcess of breaking large organic hydrocarbons into smaller molecules
nylon
cracking
quenching
polymethylmethacrylate PMMA
40. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
tacticity
step- growth/condensation polymerization
plyacrylonitrile PAN
secondary bonding
41. 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
oligomers
most common condensation/step- growth polymerization occur between....
weight average molecular weight Mw
glass transition temperature Tg
42. 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
polymers
primary termination
gauche conformation
43. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
graft copolymers
secondary bonding
alternating copolymers
polymers
44. Polymer made up of two of more differenet monomers covalently bonded together
coloring agents
end groups
copolymer
degree of polymerization DPn
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
condensation/step- growth polymerization
branching
screen pack
elastomers
46. 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
plasticizers
polyviyl chloride PVC
trans - conformation
melt spinning
47. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
tow
conformation
stabilizers
48. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
mutual termination
gauche conformation
tacticity
49. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
vulcanization
configuration
copolymer
hopper
50. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
spinneret
polyviyl chloride PVC
rayon
homopolymer