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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. 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
isotactic dan
number average molecular weight Mn
stabilizers
polyamides
2. Broad category of polymers that includes polymers containing urethane linkages
secondary bonding
High volume thermoplastics HVTP
nylon
polyurethanes
3. Conformation in which the largest substituents are offset by 180
spinneret
rayon
trans - conformation
primary bonding
4. Covalent bonding of the polymer backbone and side groups
primary bonding
melt spinning
syndiotactic dyad
thermosets
5. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
number average molecular weight Mn
addition polymerization/chain growth/free- radical polymerization
condensation/step- growth polymerization
6. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
condensation/step- growth polymerization
shot size
homopolymer
polyviyl chloride PVC
7. 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
mutual termination
step- growth/condensation polymerization
block copolymers
copolymer
8. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
petroleum
polyamides
eclipsed conformation/ cis - conformation
secondary bonding
9. 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
propagation
melt spinning
die
rayon
10. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
quenching
propagation
atactic
side groups/ substituents
11. Coloring agents that do not dissolve into the polymer
viscose process
constitution
pigments
secondary bonding
12. 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
plasticizers
vinyl monomer
side groups/ substituents
copolymer
13. Molecule containing a highly reactive unpaired electron
free radical
hopper
spinneret
copolymer
14. Polymer that is made up a single repeat unit
atactic
conformation
any carbon with double bonds or repeated substituents
homopolymer
15. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
degree of polymerization DPn
primary bonding
polymers
random copolymers
16. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
any carbon with double bonds or repeated substituents
injection molding
melt spinning
secondary bonding
17. 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
polyesters
conformation
freeze line
any carbon with double bonds or repeated substituents
18. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
copolymer
cracking
end groups
dyes
19. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
primary termination
additives
screen pack
20. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
polyesters
thermosets
aramid
constitution
21. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
gauche conformation
plyacrylonitrile PAN
functionality
polymethylmethacrylate PMMA
22. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
additives
quenching
gauche conformation
melt spinning
23. First step in the process of polymerization - during which a free radical is formed
initiation
structural unit
shot size
spinneret
24. Low- molecular- weight building blocks repeated in the polymer chain
shot size
mutual termination
monomers
alternating copolymers
25. 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
secondary bonding
side groups/ substituents
die
end groups
26. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
primary termination
extruder
viscose process
solution spinning
27. Additives whose primary purpose is to reduce the final cost of the product
fillers
structural unit
barrel
stabilizers
28. Relative configuration of adjecent asymmetric carbons
eclipsed conformation/ cis - conformation
end groups
tow
tacticity
29. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
polyamides
stabilizers
staggered conformation
30. Carbon atom capable of multiple configurations due to four different substituents
asymetric
initiation
random copolymers
number average molecular weight Mn
31. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
branching
polypphenylene terephyhalamide PPTA
tow
gauche conformation
32. 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
initiation
relative molecular mass RMM
monomers
33. Polymer made up of two of more differenet monomers covalently bonded together
side groups/ substituents
thermosets
copolymer
isotactic dan
34. 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
free radical
conformation
graft copolymers
relative molecular mass RMM
35. 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
additives
extruder
constitution
barrel
36. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
block copolymers
spinneret
secondary bonding
polymers
37. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
random copolymers
poly- p- phenylene benzobisoxazole PBO
stabilizers
atactic
38. Arrangement of the largest substituents where the substituets are offset by 120
polyviyl chloride PVC
staggered conformation
polymer backbone
extruder
39. 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
tacticity
monomers
configuration
solution spinning
40. 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
block copolymers
eclipsed conformation/ cis - conformation
secondary bonding
41. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
thermosets
polymethylmethacrylate PMMA
propagation
die
42. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
polyviyl chloride PVC
configuration
viscose process
43. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
asymetric
aramid
addition polymerization/chain growth/free- radical polymerization
graft copolymers
44. Atoms attached to the polymer backbone.
side groups/ substituents
random copolymers
trans - conformation
any carbon with double bonds or repeated substituents
45. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
graft copolymers
eclipsed conformation/ cis - conformation
polypphenylene terephyhalamide PPTA
addition polymerization/chain growth/free- radical polymerization
46. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
copolymer
barrel
rayon
asymetric
47. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
block copolymers
plasticizers
thermoplastics
glass transition temperature Tg
48. 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
trans - conformation
coloring agents
polymethylmethacrylate PMMA
isotactic dan
49. Number of repeat/structural units in a polymer chain
hopper
secondary bonding
degree of polymerization DPn
end groups
50. 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
poly- p- phenylene benzobisoxazole PBO
block copolymers
staggered conformation
copolymer