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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. Primary raw material for most polymers
dyes
petroleum
asymetric
polymers
2. Coloring agents that do not dissolve into the polymer
monomers
shot size
pigments
isotactic dan
3. Carbon atom capable of multiple configurations due to four different substituents
asymetric
eclipsed conformation/ cis - conformation
primary termination
initiation
4. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
polyviyl chloride PVC
coloring agents
propagation
extruder
5. 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
glass transition temperature Tg
step- growth/condensation polymerization
degree of polymerization DPn
syndiotactic dyad
6. 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
propagation
degree of polymerization DPn
solution spinning
polymethylmethacrylate PMMA
7. 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
polyurethanes
copolymer
block copolymers
trans - conformation
8. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
thermoplastics
screen pack
die
relative molecular mass RMM
9. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polymethylmethacrylate PMMA
shot size
any carbon with double bonds or repeated substituents
acrylic
10. An acid and an alcohol
condensation/step- growth polymerization
most common condensation/step- growth polymerization occur between....
staggered conformation
isotactic dan
11. Simple polymeric material produced as pellets in large quantities
constitution
High volume thermoplastics HVTP
termination
additives
12. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
tacticity
step- growth/condensation polymerization
acrylic
13. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
propagation
degree of polymerization DPn
addition polymerization/chain growth/free- radical polymerization
High volume thermoplastics HVTP
14. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
hopper
configuration
structural unit
quenching
15. 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
relative molecular mass RMM
number average molecular weight Mn
blends
constitution
16. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
alternating copolymers
propagation
atactic
17. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
spinneret
atactic
tow
syndiotactic dyad
18. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
initiation
block copolymers
elastomers
thermosets
19. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
condensation/step- growth polymerization
isotactic dan
rayon
extruder
20. 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
plyacrylonitrile PAN
quenching
acrylic
21. 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
High volume thermoplastics HVTP
secondary bonding
functional groups
melt spinning
22. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
elastomers
eclipsed conformation/ cis - conformation
propagation
23. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
primary bonding
conformation
oligomers
aramid
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
plasticizers
primary termination
rayon
functional groups
25. Arrangement of the largest substituents where the substituets are offset by 120
nylon
staggered conformation
syndiotactic dyad
tacticity
26. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
die
functional groups
primary bonding
polyviyl chloride PVC
27. First step in the process of polymerization - during which a free radical is formed
block copolymers
spinneret
glass transition temperature Tg
initiation
28. Porcess of breaking large organic hydrocarbons into smaller molecules
mutual termination
dyes
propagation
cracking
29. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
spinneret
viscose process
solution spinning
cracking
30. Low- molecular- weight building blocks repeated in the polymer chain
glass transition temperature Tg
monomers
barrel
aramid
31. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
monomers
isotactic dan
screen pack
32. Two or more polymers mechanically mixed together but without covalent bonding between them
staggered conformation
blends
barrel
termination
33. 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
number average molecular weight Mn
polyesters
plasticizers
trans - conformation
34. Covalently bonded chains of molecules with small monomer units repeated from end to end
die
number average molecular weight Mn
primary termination
polymers
35. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
atactic
nylon
plyacrylonitrile PAN
homopolymer
36. 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
block copolymers
solution spinning
polyamides
37. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
atactic
melt spinning
glass transition temperature Tg
38. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
side groups/ substituents
vulcanization
functional groups
end groups
39. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
tacticity
poly- p- phenylene benzobisoxazole PBO
polyamides
fillers
40. 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
branching
die
spinneret
dyes
41. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
configuration
asymetric
aramid
step- growth/condensation polymerization
42. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
extruder
eclipsed conformation/ cis - conformation
elastomers
dyes
43. Polymer made up of two of more differenet monomers covalently bonded together
screen pack
copolymer
isotactic dan
blends
44. Covalent bonding of the polymer backbone and side groups
dyes
primary bonding
viscose process
functionality
45. 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
any carbon with double bonds or repeated substituents
High volume thermoplastics HVTP
number average molecular weight Mn
plasticizers
46. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
pigments
elastomers
oligomers
blends
47. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
polyamides
tow
spinneret
homopolymer
48. Additives whose primary purpose is to reduce the final cost of the product
glass transition temperature Tg
thermoplastics
eclipsed conformation/ cis - conformation
fillers
49. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
polypphenylene terephyhalamide PPTA
tacticity
free radical
50. Broad category of polymers that includes polymers containing urethane linkages
number average molecular weight Mn
polyurethanes
thermoplastics
extruder