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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. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
weight average molecular weight Mw
stabilizers
primary bonding
primary termination
2. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tacticity
primary termination
tow
most common condensation/step- growth polymerization occur between....
3. Conformation that occurs when the largest substituent in a molecule are offset by 60
extruder
step- growth/condensation polymerization
gauche conformation
plasticizers
4. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
shot size
gauche conformation
aramid
vinyl monomer
5. Polymer made up of two of more differenet monomers covalently bonded together
graft copolymers
relative molecular mass RMM
copolymer
petroleum
6. Is not asymetric and cannot have multiple configurations
addition polymerization/chain growth/free- radical polymerization
elastomers
blends
any carbon with double bonds or repeated substituents
7. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
injection molding
plyacrylonitrile PAN
thermoplastics
petroleum
8. An acid and an alcohol
primary bonding
most common condensation/step- growth polymerization occur between....
branching
vulcanization
9. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
acrylic
melt spinning
poly- p- phenylene benzobisoxazole PBO
trans - conformation
10. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
thermosets
viscose process
plyacrylonitrile PAN
asymetric
11. Conformation in which the largest substituents are offset by 180
staggered conformation
primary termination
number average molecular weight Mn
trans - conformation
12. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
mutual termination
barrel
condensation/step- growth polymerization
termination
13. 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
quenching
injection molding
weight average molecular weight Mw
14. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
shot size
acrylic
dyes
vinyl monomer
15. Polymers that contain amide (- N-) groups in the chain
polyamides
pigments
tow
random copolymers
16. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
nylon
branching
petroleum
17. Additives whose primary purpose is to reduce the final cost of the product
step- growth/condensation polymerization
homopolymer
fillers
graft copolymers
18. Carbon atom capable of multiple configurations due to four different substituents
atactic
isotactic dan
addition polymerization/chain growth/free- radical polymerization
asymetric
19. 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
isotactic dan
die
rayon
plyacrylonitrile PAN
20. 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....
plasticizers
relative molecular mass RMM
conformation
21. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
petroleum
tacticity
propagation
viscose process
22. First step in the process of polymerization - during which a free radical is formed
acrylic
initiation
relative molecular mass RMM
primary bonding
23. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
syndiotactic dyad
asymetric
configuration
24. Arrangement of the largest substituents where the substituets are offset by 120
quenching
staggered conformation
acrylic
step- growth/condensation polymerization
25. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
branching
mutual termination
syndiotactic dyad
polyurethanes
26. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
die
plasticizers
vinyl monomer
27. Two or more polymers mechanically mixed together but without covalent bonding between them
thermosets
polyesters
blends
eclipsed conformation/ cis - conformation
28. 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
rayon
hopper
weight average molecular weight Mw
additives
29. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
tacticity
staggered conformation
step- growth/condensation polymerization
30. Smallest repeating unit in a polymer. aka repeat unit
aramid
fillers
structural unit
polyesters
31. 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
freeze line
die
vinyl monomer
cracking
32. Simple polymeric material produced as pellets in large quantities
oligomers
end groups
nylon
High volume thermoplastics HVTP
33. Primary raw material for most polymers
petroleum
addition polymerization/chain growth/free- radical polymerization
dyes
syndiotactic dyad
34. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
melt spinning
isotactic dan
atactic
addition polymerization/chain growth/free- radical polymerization
35. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
oligomers
primary termination
any carbon with double bonds or repeated substituents
elastomers
36. 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
relative molecular mass RMM
initiation
branching
conformation
37. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
vulcanization
free radical
screen pack
polyviyl chloride PVC
38. 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
petroleum
block copolymers
eclipsed conformation/ cis - conformation
side groups/ substituents
39. Softening agents
blends
any carbon with double bonds or repeated substituents
plasticizers
shot size
40. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
monomers
glass transition temperature Tg
staggered conformation
41. 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
rayon
glass transition temperature Tg
die
syndiotactic dyad
42. Covalent bonding of the polymer backbone and side groups
hopper
initiation
primary bonding
block copolymers
43. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
copolymer
injection molding
stabilizers
homopolymer
44. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
free radical
spinneret
graft copolymers
most common condensation/step- growth polymerization occur between....
45. 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
polymer backbone
poly- p- phenylene benzobisoxazole PBO
pigments
46. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
polymethylmethacrylate PMMA
thermosets
constitution
47. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
homopolymer
degree of polymerization DPn
propagation
freeze line
48. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
blends
coloring agents
alternating copolymers
primary bonding
49. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
branching
polyviyl chloride PVC
freeze line
polypphenylene terephyhalamide PPTA
50. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
weight average molecular weight Mw
primary termination
shot size
thermosets