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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. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
polyviyl chloride PVC
rayon
tow
polymer backbone
2. First step in the process of polymerization - during which a free radical is formed
initiation
primary termination
secondary bonding
injection molding
3. 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
polymethylmethacrylate PMMA
random copolymers
quenching
plasticizers
4. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
step- growth/condensation polymerization
polymers
polyesters
5. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
monomers
melt spinning
functionality
6. Relative configuration of adjecent asymmetric carbons
tacticity
primary termination
any carbon with double bonds or repeated substituents
functional groups
7. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
thermoplastics
most common condensation/step- growth polymerization occur between....
polypphenylene terephyhalamide PPTA
8. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
polymethylmethacrylate PMMA
vulcanization
initiation
9. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
shot size
polyviyl chloride PVC
random copolymers
spinneret
10. Broad category of polymers that includes polymers containing urethane linkages
quenching
polyurethanes
any carbon with double bonds or repeated substituents
isotactic dan
11. 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
step- growth/condensation polymerization
initiation
polymethylmethacrylate PMMA
functionality
12. Pigments or dyes that change the way light is absorbed or reflected by a polymer
conformation
coloring agents
polyviyl chloride PVC
polymethylmethacrylate PMMA
13. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
end groups
glass transition temperature Tg
fillers
eclipsed conformation/ cis - conformation
14. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
monomers
polyviyl chloride PVC
oligomers
thermoplastics
15. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
staggered conformation
trans - conformation
step- growth/condensation polymerization
16. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
staggered conformation
coloring agents
side groups/ substituents
viscose process
17. Atoms attached to the polymer backbone.
acrylic
primary bonding
side groups/ substituents
asymetric
18. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
syndiotactic dyad
additives
side groups/ substituents
19. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
syndiotactic dyad
free radical
polyamides
20. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
thermosets
quenching
polyamides
21. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
propagation
structural unit
dyes
22. 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
mutual termination
thermoplastics
end groups
step- growth/condensation polymerization
23. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
structural unit
polymer backbone
tow
glass transition temperature Tg
24. 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
copolymer
aramid
eclipsed conformation/ cis - conformation
25. 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
condensation/step- growth polymerization
freeze line
thermoplastics
26. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
weight average molecular weight Mw
secondary bonding
viscose process
27. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
acrylic
stabilizers
freeze line
branching
28. Conformation that occurs when the largest substituent in a molecule are offset by 60
elastomers
gauche conformation
pigments
step- growth/condensation polymerization
29. Number of bonds a molecule has formed
syndiotactic dyad
functionality
additives
polyviyl chloride PVC
30. Polymer that is made up a single repeat unit
homopolymer
polyamides
primary termination
branching
31. Low- molecular- weight building blocks repeated in the polymer chain
rayon
condensation/step- growth polymerization
monomers
tacticity
32. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
staggered conformation
secondary bonding
polymethylmethacrylate PMMA
syndiotactic dyad
33. 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
plyacrylonitrile PAN
propagation
melt spinning
primary bonding
34. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
elastomers
structural unit
number average molecular weight Mn
vulcanization
35. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
plyacrylonitrile PAN
vinyl monomer
graft copolymers
termination
36. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
additives
conformation
vulcanization
relative molecular mass RMM
37. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
melt spinning
constitution
plasticizers
38. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight
polyamides
alternating copolymers
relative molecular mass RMM
polymers
39. Additives whose primary purpose is to reduce the final cost of the product
block copolymers
most common condensation/step- growth polymerization occur between....
fillers
rayon
40. Polymers that contain amide (- N-) groups in the chain
isotactic dan
tacticity
staggered conformation
polyamides
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
free radical
additives
gauche conformation
42. Conformation in which the largest substituents are offset by 180
trans - conformation
melt spinning
acrylic
secondary bonding
43. 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
conformation
block copolymers
dyes
degree of polymerization DPn
44. An acid and an alcohol
termination
polymethylmethacrylate PMMA
quenching
most common condensation/step- growth polymerization occur between....
45. 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
alternating copolymers
hopper
branching
thermoplastics
46. Double bounded organic molecule used to begin addition polymerization
most common condensation/step- growth polymerization occur between....
tacticity
copolymer
vinyl monomer
47. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
dyes
injection molding
secondary bonding
polypphenylene terephyhalamide PPTA
48. Number of repeat/structural units in a polymer chain
thermosets
solution spinning
degree of polymerization DPn
additives
49. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
solution spinning
syndiotactic dyad
polyurethanes
thermosets
50. 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
additives
glass transition temperature Tg
blends
configuration