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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. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber
barrel
monomers
block copolymers
screen pack
2. Conformation in which the largest substituents are offset by 180
polymer backbone
elastomers
trans - conformation
stabilizers
3. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
vinyl monomer
random copolymers
most common condensation/step- growth polymerization occur between....
polyurethanes
4. Carbon atom capable of multiple configurations due to four different substituents
asymetric
trans - conformation
hopper
rayon
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
block copolymers
side groups/ substituents
glass transition temperature Tg
conformation
6. 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
plyacrylonitrile PAN
step- growth/condensation polymerization
melt spinning
barrel
7. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
functional groups
pigments
vulcanization
staggered conformation
8. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
polymers
dyes
fillers
thermoplastics
9. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
thermosets
functional groups
eclipsed conformation/ cis - conformation
additives
10. Low- molecular- weight building blocks repeated in the polymer chain
acrylic
mutual termination
cracking
monomers
11. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
syndiotactic dyad
any carbon with double bonds or repeated substituents
dyes
termination
12. Broad category of polymers that includes polymers containing urethane linkages
nylon
screen pack
syndiotactic dyad
polyurethanes
13. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
primary termination
oligomers
thermosets
High volume thermoplastics HVTP
14. One type of polymer that contains at least 85% of polyacrylonitrile PAN
polyurethanes
acrylic
propagation
quenching
15. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
homopolymer
termination
polymer backbone
16. Pigments or dyes that change the way light is absorbed or reflected by a polymer
free radical
coloring agents
atactic
initiation
17. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
injection molding
syndiotactic dyad
shot size
thermosets
18. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
propagation
melt spinning
polymethylmethacrylate PMMA
syndiotactic dyad
19. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
stabilizers
polyamides
plyacrylonitrile PAN
any carbon with double bonds or repeated substituents
20. Molecule containing a highly reactive unpaired electron
most common condensation/step- growth polymerization occur between....
polyesters
propagation
free radical
21. 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
syndiotactic dyad
tacticity
branching
polyurethanes
22. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
acrylic
eclipsed conformation/ cis - conformation
propagation
graft copolymers
23. 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
functionality
petroleum
relative molecular mass RMM
random copolymers
24. Polymers that contain amide (- N-) groups in the chain
acrylic
gauche conformation
asymetric
polyamides
25. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
degree of polymerization DPn
block copolymers
conformation
polymethylmethacrylate PMMA
26. Covalent bonding of the polymer backbone and side groups
aramid
condensation/step- growth polymerization
barrel
primary bonding
27. Polymer that is made up a single repeat unit
plyacrylonitrile PAN
plasticizers
homopolymer
aramid
28. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
nylon
oligomers
weight average molecular weight Mw
screen pack
29. Smallest repeating unit in a polymer. aka repeat unit
dyes
termination
tow
structural unit
30. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
most common condensation/step- growth polymerization occur between....
spinneret
vulcanization
primary termination
31. Arrangement of the largest substituents where the substituets are offset by 120
shot size
staggered conformation
vinyl monomer
degree of polymerization DPn
32. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
constitution
weight average molecular weight Mw
blends
33. 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
thermosets
acrylic
condensation/step- growth polymerization
plasticizers
34. Atoms attached to the polymer backbone.
staggered conformation
side groups/ substituents
structural unit
polymers
35. Double bounded organic molecule used to begin addition polymerization
polymers
vinyl monomer
monomers
weight average molecular weight Mw
36. Two or more polymers mechanically mixed together but without covalent bonding between them
extruder
blends
glass transition temperature Tg
rayon
37. Simple polymeric material produced as pellets in large quantities
solution spinning
copolymer
High volume thermoplastics HVTP
termination
38. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
barrel
stabilizers
poly- p- phenylene benzobisoxazole PBO
polyamides
39. Polymer made up of two of more differenet monomers covalently bonded together
blends
polyesters
copolymer
degree of polymerization DPn
40. Primary raw material for most polymers
number average molecular weight Mn
structural unit
tow
petroleum
41. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
poly- p- phenylene benzobisoxazole PBO
alternating copolymers
isotactic dan
42. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
primary termination
homopolymer
secondary bonding
barrel
43. 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
die
oligomers
aramid
weight average molecular weight Mw
44. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polymer backbone
polypphenylene terephyhalamide PPTA
polyamides
additives
45. Is not asymetric and cannot have multiple configurations
termination
shot size
any carbon with double bonds or repeated substituents
most common condensation/step- growth polymerization occur between....
46. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
barrel
polyviyl chloride PVC
initiation
viscose process
47. 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
staggered conformation
plyacrylonitrile PAN
glass transition temperature Tg
eclipsed conformation/ cis - conformation
48. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
coloring agents
syndiotactic dyad
propagation
any carbon with double bonds or repeated substituents
49. Softening agents
solution spinning
termination
oligomers
plasticizers
50. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
functional groups
block copolymers
polymethylmethacrylate PMMA
any carbon with double bonds or repeated substituents