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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. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
conformation
homopolymer
blends
2. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
petroleum
alternating copolymers
dyes
3. Broad category of polymers that includes polymers containing urethane linkages
atactic
polyurethanes
polyesters
polypphenylene terephyhalamide PPTA
4. 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
plyacrylonitrile PAN
glass transition temperature Tg
homopolymer
syndiotactic dyad
5. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polyviyl chloride PVC
hopper
graft copolymers
additives
6. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
fillers
isotactic dan
oligomers
spinneret
7. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
functional groups
primary termination
propagation
secondary bonding
8. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
polyurethanes
termination
conformation
rayon
9. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
configuration
primary bonding
constitution
10. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
staggered conformation
homopolymer
gauche conformation
conformation
11. Covalently bonded chains of molecules with small monomer units repeated from end to end
poly- p- phenylene benzobisoxazole PBO
quenching
polymers
functional groups
12. Softening agents
polyurethanes
injection molding
plasticizers
isotactic dan
13. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
syndiotactic dyad
viscose process
secondary bonding
primary termination
14. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
viscose process
branching
atactic
alternating copolymers
15. Polymer that is made up a single repeat unit
polyamides
polypphenylene terephyhalamide PPTA
propagation
homopolymer
16. One type of polymer that contains at least 85% of polyacrylonitrile PAN
termination
syndiotactic dyad
viscose process
acrylic
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
monomers
configuration
primary bonding
18. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
die
free radical
addition polymerization/chain growth/free- radical polymerization
graft copolymers
19. Molecule containing a highly reactive unpaired electron
free radical
functionality
spinneret
condensation/step- growth polymerization
20. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
polymethylmethacrylate PMMA
polymers
spinneret
21. Covalent bonding of the polymer backbone and side groups
primary bonding
secondary bonding
polyamides
tow
22. Low- molecular- weight building blocks repeated in the polymer chain
monomers
trans - conformation
initiation
coloring agents
23. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
petroleum
functional groups
vulcanization
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
polyviyl chloride PVC
asymetric
freeze line
25. Is not asymetric and cannot have multiple configurations
graft copolymers
vinyl monomer
barrel
any carbon with double bonds or repeated substituents
26. 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
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
conformation
27. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
constitution
injection molding
number average molecular weight Mn
28. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
monomers
polyesters
end groups
coloring agents
29. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
plasticizers
constitution
spinneret
30. Smallest repeating unit in a polymer. aka repeat unit
structural unit
viscose process
petroleum
injection molding
31. 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
shot size
condensation/step- growth polymerization
mutual termination
branching
32. Double bounded organic molecule used to begin addition polymerization
weight average molecular weight Mw
cracking
rayon
vinyl monomer
33. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
stabilizers
blends
most common condensation/step- growth polymerization occur between....
spinneret
34. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
homopolymer
polyurethanes
polymethylmethacrylate PMMA
nylon
35. 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
random copolymers
plasticizers
step- growth/condensation polymerization
vinyl monomer
36. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
weight average molecular weight Mw
free radical
poly- p- phenylene benzobisoxazole PBO
37. 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
die
weight average molecular weight Mw
constitution
configuration
38. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
High volume thermoplastics HVTP
configuration
rayon
monomers
39. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
High volume thermoplastics HVTP
copolymer
propagation
40. 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
melt spinning
glass transition temperature Tg
polypphenylene terephyhalamide PPTA
poly- p- phenylene benzobisoxazole PBO
41. 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
isotactic dan
weight average molecular weight Mw
screen pack
thermosets
42. Polymers that contain amide (- N-) groups in the chain
polyamides
syndiotactic dyad
branching
pigments
43. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
staggered conformation
conformation
initiation
tow
44. 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
nylon
blends
plasticizers
functionality
45. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
propagation
syndiotactic dyad
staggered conformation
freeze line
46. 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
screen pack
plasticizers
block copolymers
thermosets
47. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
freeze line
propagation
free radical
polypphenylene terephyhalamide PPTA
48. 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
number average molecular weight Mn
coloring agents
weight average molecular weight Mw
tacticity
49. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
pigments
screen pack
free radical
50. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
any carbon with double bonds or repeated substituents
fillers
polyviyl chloride PVC
alternating copolymers
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