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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
pigments
extruder
dyes
2. Atoms attached to the polymer backbone.
staggered conformation
side groups/ substituents
secondary bonding
functionality
3. 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
polyamides
dyes
copolymer
4. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
condensation/step- growth polymerization
block copolymers
glass transition temperature Tg
5. Polymer that is made up a single repeat unit
homopolymer
polypphenylene terephyhalamide PPTA
functionality
branching
6. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
hopper
nylon
die
free radical
7. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
any carbon with double bonds or repeated substituents
step- growth/condensation polymerization
coloring agents
8. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
graft copolymers
rayon
fillers
9. 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
atactic
melt spinning
viscose process
die
10. 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
polyamides
weight average molecular weight Mw
polypphenylene terephyhalamide PPTA
step- growth/condensation polymerization
11. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
polyesters
elastomers
termination
isotactic dan
12. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
dyes
functionality
propagation
plasticizers
13. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
polyamides
plasticizers
viscose process
oligomers
14. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
free radical
staggered conformation
melt spinning
15. Simple polymeric material produced as pellets in large quantities
functionality
relative molecular mass RMM
shot size
High volume thermoplastics HVTP
16. Carbon atom capable of multiple configurations due to four different substituents
vinyl monomer
elastomers
acrylic
asymetric
17. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
polyesters
die
injection molding
18. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
polypphenylene terephyhalamide PPTA
atactic
number average molecular weight Mn
aramid
19. Smallest repeating unit in a polymer. aka repeat unit
structural unit
viscose process
degree of polymerization DPn
primary termination
20. One type of polymer that contains at least 85% of polyacrylonitrile PAN
any carbon with double bonds or repeated substituents
glass transition temperature Tg
polymers
acrylic
21. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
relative molecular mass RMM
screen pack
staggered conformation
oligomers
22. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
eclipsed conformation/ cis - conformation
termination
branching
most common condensation/step- growth polymerization occur between....
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
solution spinning
relative molecular mass RMM
condensation/step- growth polymerization
polyurethanes
24. 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
alternating copolymers
viscose process
plasticizers
step- growth/condensation polymerization
25. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
shot size
eclipsed conformation/ cis - conformation
hopper
gauche conformation
26. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
polyamides
polymethylmethacrylate PMMA
polyviyl chloride PVC
thermosets
27. 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
weight average molecular weight Mw
injection molding
spinneret
solution spinning
28. Polymers that contain amide (- N-) groups in the chain
additives
polyamides
plyacrylonitrile PAN
staggered conformation
29. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
condensation/step- growth polymerization
constitution
glass transition temperature Tg
free radical
30. Arrangement of the largest substituents where the substituets are offset by 120
blends
aramid
alternating copolymers
staggered conformation
31. 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
step- growth/condensation polymerization
number average molecular weight Mn
end groups
hopper
32. Softening agents
plasticizers
degree of polymerization DPn
die
polyamides
33. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
cracking
configuration
tacticity
end groups
34. Number of repeat/structural units in a polymer chain
step- growth/condensation polymerization
any carbon with double bonds or repeated substituents
additives
degree of polymerization DPn
35. 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
branching
alternating copolymers
aramid
36. First step in the process of polymerization - during which a free radical is formed
glass transition temperature Tg
functionality
stabilizers
initiation
37. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
acrylic
isotactic dan
shot size
polyviyl chloride PVC
38. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymers
polymer backbone
dyes
most common condensation/step- growth polymerization occur between....
39. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
freeze line
relative molecular mass RMM
thermoplastics
40. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
plasticizers
primary termination
pigments
spinneret
41. 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
end groups
primary termination
spinneret
42. 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
vulcanization
condensation/step- growth polymerization
elastomers
cracking
43. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
plyacrylonitrile PAN
polypphenylene terephyhalamide PPTA
secondary bonding
homopolymer
44. Molecule containing a highly reactive unpaired electron
elastomers
asymetric
free radical
functional groups
45. Number of bonds a molecule has formed
most common condensation/step- growth polymerization occur between....
freeze line
pigments
functionality
46. Pigments or dyes that change the way light is absorbed or reflected by a polymer
thermosets
coloring agents
addition polymerization/chain growth/free- radical polymerization
dyes
47. Covalent bonding of the polymer backbone and side groups
pigments
stabilizers
primary bonding
syndiotactic dyad
48. Porcess of breaking large organic hydrocarbons into smaller molecules
plasticizers
gauche conformation
cracking
branching
49. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
alternating copolymers
solution spinning
quenching
50. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
termination
addition polymerization/chain growth/free- radical polymerization
freeze line
degree of polymerization DPn