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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. 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
primary termination
polyesters
end groups
free radical
2. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
primary bonding
polyurethanes
extruder
poly- p- phenylene benzobisoxazole PBO
3. Broad category of polymers that includes polymers containing urethane linkages
barrel
polyurethanes
graft copolymers
structural unit
4. 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
configuration
eclipsed conformation/ cis - conformation
mutual termination
freeze line
5. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
additives
end groups
thermosets
fillers
6. Number of repeat/structural units in a polymer chain
dyes
degree of polymerization DPn
gauche conformation
solution spinning
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
acrylic
thermoplastics
injection molding
initiation
8. First step in the process of polymerization - during which a free radical is formed
condensation/step- growth polymerization
initiation
fillers
extruder
9. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
alternating copolymers
weight average molecular weight Mw
blends
10. Polymers that contain amide (- N-) groups in the chain
addition polymerization/chain growth/free- radical polymerization
polyamides
tacticity
polymers
11. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
polymethylmethacrylate PMMA
graft copolymers
condensation/step- growth polymerization
12. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
staggered conformation
extruder
nylon
functionality
13. 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
pigments
plasticizers
High volume thermoplastics HVTP
aramid
14. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
plyacrylonitrile PAN
polymethylmethacrylate PMMA
constitution
block copolymers
15. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
step- growth/condensation polymerization
degree of polymerization DPn
atactic
16. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
injection molding
shot size
propagation
solution spinning
17. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
number average molecular weight Mn
polymers
polypphenylene terephyhalamide PPTA
spinneret
18. Relative configuration of adjecent asymmetric carbons
spinneret
tacticity
secondary bonding
alternating copolymers
19. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
melt spinning
alternating copolymers
coloring agents
screen pack
20. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
most common condensation/step- growth polymerization occur between....
secondary bonding
fillers
monomers
21. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
quenching
glass transition temperature Tg
polyviyl chloride PVC
polyurethanes
22. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
primary termination
staggered conformation
pigments
23. 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
elastomers
configuration
number average molecular weight Mn
melt spinning
24. Simple polymeric material produced as pellets in large quantities
branching
rayon
functionality
High volume thermoplastics HVTP
25. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
oligomers
polyamides
dyes
26. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
fillers
nylon
staggered conformation
pigments
27. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
polymers
viscose process
primary termination
28. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
monomers
polypphenylene terephyhalamide PPTA
tow
syndiotactic dyad
29. Covalently bonded chains of molecules with small monomer units repeated from end to end
copolymer
number average molecular weight Mn
eclipsed conformation/ cis - conformation
polymers
30. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
block copolymers
extruder
any carbon with double bonds or repeated substituents
31. Polymer that is made up a single repeat unit
relative molecular mass RMM
staggered conformation
homopolymer
termination
32. An acid and an alcohol
screen pack
side groups/ substituents
most common condensation/step- growth polymerization occur between....
monomers
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
condensation/step- growth polymerization
extruder
screen pack
fillers
34. Covalent bonding of the polymer backbone and side groups
injection molding
primary bonding
polymers
primary termination
35. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
monomers
functional groups
polyamides
eclipsed conformation/ cis - conformation
36. Molecule containing a highly reactive unpaired electron
gauche conformation
branching
graft copolymers
free radical
37. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
thermoplastics
number average molecular weight Mn
graft copolymers
eclipsed conformation/ cis - conformation
38. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
configuration
asymetric
conformation
oligomers
39. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
number average molecular weight Mn
most common condensation/step- growth polymerization occur between....
gauche conformation
40. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
structural unit
coloring agents
poly- p- phenylene benzobisoxazole PBO
41. 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
end groups
injection molding
condensation/step- growth polymerization
relative molecular mass RMM
42. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
polyurethanes
step- growth/condensation polymerization
primary termination
nylon
43. 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
primary termination
melt spinning
primary bonding
eclipsed conformation/ cis - conformation
44. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
addition polymerization/chain growth/free- radical polymerization
additives
injection molding
45. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
quenching
spinneret
random copolymers
additives
46. Low- molecular- weight building blocks repeated in the polymer chain
screen pack
monomers
staggered conformation
alternating copolymers
47. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
screen pack
addition polymerization/chain growth/free- radical polymerization
termination
polymers
48. 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
vulcanization
hopper
barrel
glass transition temperature Tg
49. 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
most common condensation/step- growth polymerization occur between....
plasticizers
block copolymers
solution spinning
50. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
elastomers
polyurethanes
polymethylmethacrylate PMMA