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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. Covalent bonding of the polymer backbone and side groups
graft copolymers
random copolymers
spinneret
primary bonding
2. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
branching
syndiotactic dyad
polyviyl chloride PVC
barrel
3. Atoms attached to the polymer backbone.
blends
isotactic dan
configuration
side groups/ substituents
4. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
petroleum
isotactic dan
atactic
5. 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
nylon
secondary bonding
stabilizers
block copolymers
6. 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
side groups/ substituents
conformation
die
any carbon with double bonds or repeated substituents
7. Polymer that is made up a single repeat unit
homopolymer
step- growth/condensation polymerization
monomers
polymethylmethacrylate PMMA
8. Polymers that contain amide (- N-) groups in the chain
nylon
polyamides
condensation/step- growth polymerization
functionality
9. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
barrel
spinneret
additives
end groups
10. Pigments or dyes that change the way light is absorbed or reflected by a polymer
syndiotactic dyad
pigments
relative molecular mass RMM
coloring agents
11. Relative configuration of adjecent asymmetric carbons
quenching
aramid
die
tacticity
12. 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
shot size
atactic
polymer backbone
13. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
atactic
copolymer
random copolymers
14. Smallest repeating unit in a polymer. aka repeat unit
termination
monomers
constitution
structural unit
15. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
free radical
staggered conformation
screen pack
16. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
shot size
free radical
poly- p- phenylene benzobisoxazole PBO
conformation
17. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
cracking
eclipsed conformation/ cis - conformation
atactic
thermosets
18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polymers
configuration
step- growth/condensation polymerization
free radical
19. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
spinneret
atactic
functional groups
20. 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
plyacrylonitrile PAN
syndiotactic dyad
configuration
weight average molecular weight Mw
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
most common condensation/step- growth polymerization occur between....
initiation
plasticizers
eclipsed conformation/ cis - conformation
22. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
glass transition temperature Tg
functionality
tow
screen pack
23. Coloring agents that do not dissolve into the polymer
High volume thermoplastics HVTP
pigments
primary bonding
monomers
24. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
vinyl monomer
alternating copolymers
spinneret
dyes
25. Number of bonds a molecule has formed
functionality
monomers
blends
tacticity
26. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
constitution
step- growth/condensation polymerization
side groups/ substituents
27. Molecule containing a highly reactive unpaired electron
cracking
polymer backbone
freeze line
free radical
28. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
freeze line
dyes
melt spinning
29. Low- molecular- weight building blocks repeated in the polymer chain
monomers
random copolymers
primary bonding
additives
30. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
oligomers
pigments
vinyl monomer
vulcanization
31. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
petroleum
stabilizers
syndiotactic dyad
atactic
32. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
alternating copolymers
configuration
functional groups
aramid
33. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
syndiotactic dyad
melt spinning
end groups
polymer backbone
34. Arrangement of the largest substituents where the substituets are offset by 120
atactic
staggered conformation
monomers
secondary bonding
35. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
addition polymerization/chain growth/free- radical polymerization
side groups/ substituents
elastomers
acrylic
36. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
copolymer
injection molding
blends
screen pack
37. 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
fillers
secondary bonding
relative molecular mass RMM
number average molecular weight Mn
38. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polyamides
spinneret
hopper
aramid
39. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
quenching
conformation
propagation
melt spinning
40. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
viscose process
extruder
stabilizers
conformation
41. 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
isotactic dan
glass transition temperature Tg
vinyl monomer
42. Double bounded organic molecule used to begin addition polymerization
thermoplastics
structural unit
vinyl monomer
aramid
43. Porcess of breaking large organic hydrocarbons into smaller molecules
random copolymers
graft copolymers
cracking
freeze line
44. Conformation in which the largest substituents are offset by 180
shot size
glass transition temperature Tg
addition polymerization/chain growth/free- radical polymerization
trans - conformation
45. Number of repeat/structural units in a polymer chain
trans - conformation
constitution
alternating copolymers
degree of polymerization DPn
46. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
rayon
nylon
stabilizers
freeze line
47. Carbon atom capable of multiple configurations due to four different substituents
tacticity
side groups/ substituents
asymetric
structural unit
48. 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
random copolymers
glass transition temperature Tg
fillers
die
49. 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
tacticity
aramid
thermoplastics
isotactic dan
50. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
vulcanization
gauche conformation
termination