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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. Atoms attached to the polymer backbone.
High volume thermoplastics HVTP
branching
side groups/ substituents
vulcanization
2. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
trans - conformation
any carbon with double bonds or repeated substituents
freeze line
3. Polymer made up of two of more differenet monomers covalently bonded together
polyamides
copolymer
plasticizers
tacticity
4. An acid and an alcohol
thermoplastics
aramid
vulcanization
most common condensation/step- growth polymerization occur between....
5. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
coloring agents
acrylic
isotactic dan
alternating copolymers
6. Polymer that is made up a single repeat unit
thermoplastics
homopolymer
branching
melt spinning
7. Number of bonds a molecule has formed
functionality
gauche conformation
alternating copolymers
melt spinning
8. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
monomers
polyamides
secondary bonding
polyesters
9. 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
termination
polyesters
petroleum
extruder
10. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
secondary bonding
polymers
hopper
elastomers
11. 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
number average molecular weight Mn
polymethylmethacrylate PMMA
thermosets
conformation
12. 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
glass transition temperature Tg
propagation
copolymer
functional groups
13. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
acrylic
end groups
most common condensation/step- growth polymerization occur between....
gauche conformation
14. 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
vinyl monomer
syndiotactic dyad
step- growth/condensation polymerization
thermoplastics
15. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
alternating copolymers
melt spinning
random copolymers
16. 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
branching
isotactic dan
trans - conformation
weight average molecular weight Mw
17. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
fillers
thermosets
configuration
hopper
18. First step in the process of polymerization - during which a free radical is formed
propagation
branching
acrylic
initiation
19. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
polymers
graft copolymers
primary bonding
20. Smallest repeating unit in a polymer. aka repeat unit
glass transition temperature Tg
structural unit
acrylic
aramid
21. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
most common condensation/step- growth polymerization occur between....
configuration
condensation/step- growth polymerization
spinneret
22. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
melt spinning
nylon
branching
23. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
High volume thermoplastics HVTP
plyacrylonitrile PAN
atactic
aramid
24. Softening agents
tow
plasticizers
thermosets
random copolymers
25. Primary raw material for most polymers
plyacrylonitrile PAN
rayon
primary bonding
petroleum
26. 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
plasticizers
die
primary bonding
dyes
27. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
plasticizers
High volume thermoplastics HVTP
tow
28. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
random copolymers
tacticity
configuration
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
solution spinning
functionality
functional groups
plyacrylonitrile PAN
30. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
polyesters
plasticizers
block copolymers
spinneret
31. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
weight average molecular weight Mw
functional groups
rayon
solution spinning
32. Broad category of polymers that includes polymers containing urethane linkages
aramid
polyurethanes
polymer backbone
coloring agents
33. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
condensation/step- growth polymerization
isotactic dan
polymers
34. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
polyesters
syndiotactic dyad
alternating copolymers
melt spinning
35. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
plasticizers
polymer backbone
High volume thermoplastics HVTP
branching
36. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
polyviyl chloride PVC
staggered conformation
freeze line
random copolymers
37. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
termination
end groups
viscose process
conformation
38. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
pigments
constitution
freeze line
aramid
39. Conformation that occurs when the largest substituent in a molecule are offset by 60
nylon
gauche conformation
secondary bonding
injection molding
40. Simple polymeric material produced as pellets in large quantities
weight average molecular weight Mw
High volume thermoplastics HVTP
primary bonding
polymers
41. 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
any carbon with double bonds or repeated substituents
conformation
primary bonding
42. Covalent bonding of the polymer backbone and side groups
coloring agents
cracking
number average molecular weight Mn
primary bonding
43. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
branching
petroleum
shot size
44. One type of polymer that contains at least 85% of polyacrylonitrile PAN
copolymer
pigments
plasticizers
acrylic
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
rayon
screen pack
constitution
46. 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
mutual termination
branching
functionality
gauche conformation
47. Conformation in which the largest substituents are offset by 180
thermoplastics
trans - conformation
petroleum
branching
48. Two or more polymers mechanically mixed together but without covalent bonding between them
vulcanization
blends
poly- p- phenylene benzobisoxazole PBO
constitution
49. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
elastomers
vulcanization
any carbon with double bonds or repeated substituents
eclipsed conformation/ cis - conformation
50. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
rayon
quenching
atactic