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. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
cracking
structural unit
constitution
2. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
melt spinning
constitution
additives
plasticizers
3. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
viscose process
High volume thermoplastics HVTP
elastomers
additives
4. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
cracking
any carbon with double bonds or repeated substituents
nylon
initiation
5. 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
condensation/step- growth polymerization
number average molecular weight Mn
solution spinning
pigments
6. Atoms attached to the polymer backbone.
alternating copolymers
number average molecular weight Mn
poly- p- phenylene benzobisoxazole PBO
side groups/ substituents
7. Number of bonds a molecule has formed
functionality
polyamides
random copolymers
cracking
8. Conformation in which the largest substituents are offset by 180
trans - conformation
polymers
tacticity
polyurethanes
9. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
weight average molecular weight Mw
polymer backbone
condensation/step- growth polymerization
10. Primary raw material for most polymers
syndiotactic dyad
side groups/ substituents
functionality
petroleum
11. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
functional groups
viscose process
tow
12. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
screen pack
elastomers
rayon
stabilizers
13. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
alternating copolymers
rayon
polypphenylene terephyhalamide PPTA
14. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
staggered conformation
plasticizers
stabilizers
functional groups
15. First step in the process of polymerization - during which a free radical is formed
eclipsed conformation/ cis - conformation
initiation
additives
polymers
16. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
freeze line
random copolymers
vinyl monomer
polymethylmethacrylate PMMA
17. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
oligomers
coloring agents
structural unit
18. 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
end groups
mutual termination
number average molecular weight Mn
trans - conformation
19. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
plyacrylonitrile PAN
dyes
condensation/step- growth polymerization
20. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
pigments
secondary bonding
syndiotactic dyad
21. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
functionality
polyurethanes
polymer backbone
configuration
22. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
graft copolymers
conformation
elastomers
thermosets
23. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
tacticity
cracking
atactic
24. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
acrylic
homopolymer
syndiotactic dyad
nylon
25. Double bounded organic molecule used to begin addition polymerization
elastomers
plyacrylonitrile PAN
vinyl monomer
polyviyl chloride PVC
26. 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
gauche conformation
isotactic dan
any carbon with double bonds or repeated substituents
shot size
27. Porcess of breaking large organic hydrocarbons into smaller molecules
asymetric
branching
cracking
polyurethanes
28. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
plasticizers
hopper
extruder
thermoplastics
29. 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
polypphenylene terephyhalamide PPTA
eclipsed conformation/ cis - conformation
branching
hopper
30. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermoplastics
nylon
eclipsed conformation/ cis - conformation
thermosets
31. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
stabilizers
solution spinning
oligomers
32. Relative configuration of adjecent asymmetric carbons
block copolymers
tacticity
branching
fillers
33. Softening agents
eclipsed conformation/ cis - conformation
plasticizers
polyviyl chloride PVC
polymer backbone
34. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
oligomers
nylon
quenching
High volume thermoplastics HVTP
35. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
elastomers
vulcanization
atactic
end groups
36. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
plyacrylonitrile PAN
any carbon with double bonds or repeated substituents
dyes
injection molding
37. 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
step- growth/condensation polymerization
number average molecular weight Mn
isotactic dan
melt spinning
38. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
primary termination
additives
solution spinning
secondary bonding
39. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
mutual termination
gauche conformation
constitution
40. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
plyacrylonitrile PAN
graft copolymers
vulcanization
syndiotactic dyad
41. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
homopolymer
alternating copolymers
polyviyl chloride PVC
primary termination
42. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
vinyl monomer
vulcanization
rayon
atactic
43. Is not asymetric and cannot have multiple configurations
syndiotactic dyad
primary bonding
any carbon with double bonds or repeated substituents
propagation
44. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
cracking
elastomers
eclipsed conformation/ cis - conformation
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
primary termination
shot size
constitution
mutual termination
46. Low- molecular- weight building blocks repeated in the polymer chain
degree of polymerization DPn
primary termination
monomers
plyacrylonitrile PAN
47. Coloring agents that do not dissolve into the polymer
pigments
propagation
monomers
thermoplastics
48. Smallest repeating unit in a polymer. aka repeat unit
alternating copolymers
structural unit
nylon
rayon
49. Polymer made up of two of more differenet monomers covalently bonded together
polyesters
spinneret
High volume thermoplastics HVTP
copolymer
50. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
shot size
freeze line
staggered conformation
polyamides