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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. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
free radical
constitution
end groups
propagation
2. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
weight average molecular weight Mw
graft copolymers
staggered conformation
viscose process
3. Primary raw material for most polymers
petroleum
extruder
functional groups
secondary bonding
4. First step in the process of polymerization - during which a free radical is formed
monomers
die
free radical
initiation
5. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
free radical
degree of polymerization DPn
side groups/ substituents
conformation
6. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
copolymer
functionality
homopolymer
elastomers
7. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
random copolymers
vinyl monomer
configuration
8. 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
initiation
coloring agents
die
9. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
solution spinning
functionality
extruder
secondary bonding
10. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
relative molecular mass RMM
constitution
elastomers
11. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
termination
vulcanization
aramid
functional groups
12. 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
asymetric
functionality
weight average molecular weight Mw
die
13. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
primary termination
polyviyl chloride PVC
freeze line
staggered conformation
14. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
tow
aramid
coloring agents
rayon
15. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
graft copolymers
fillers
degree of polymerization DPn
16. 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
thermoplastics
monomers
mutual termination
thermosets
17. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
High volume thermoplastics HVTP
extruder
plyacrylonitrile PAN
configuration
18. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
hopper
stabilizers
addition polymerization/chain growth/free- radical polymerization
injection molding
19. Number of bonds a molecule has formed
acrylic
blends
functionality
primary bonding
20. Polymer made up of two of more differenet monomers covalently bonded together
poly- p- phenylene benzobisoxazole PBO
homopolymer
copolymer
fillers
21. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
polyamides
secondary bonding
plasticizers
22. 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
dyes
number average molecular weight Mn
isotactic dan
plasticizers
23. 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
quenching
secondary bonding
die
relative molecular mass RMM
24. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
plasticizers
thermoplastics
polymethylmethacrylate PMMA
polyviyl chloride PVC
25. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
polyurethanes
polyesters
tacticity
syndiotactic dyad
26. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
freeze line
quenching
condensation/step- growth polymerization
27. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
relative molecular mass RMM
polymethylmethacrylate PMMA
primary termination
28. 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
mutual termination
condensation/step- growth polymerization
relative molecular mass RMM
syndiotactic dyad
29. Coloring agents that do not dissolve into the polymer
structural unit
vulcanization
functionality
pigments
30. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
end groups
termination
injection molding
functionality
31. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
rayon
structural unit
most common condensation/step- growth polymerization occur between....
32. Polymer that is made up a single repeat unit
homopolymer
thermosets
addition polymerization/chain growth/free- radical polymerization
gauche conformation
33. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
block copolymers
spinneret
viscose process
end groups
34. 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
poly- p- phenylene benzobisoxazole PBO
fillers
solution spinning
35. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
freeze line
polymer backbone
thermosets
additives
36. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polypphenylene terephyhalamide PPTA
atactic
block copolymers
weight average molecular weight Mw
37. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
primary bonding
gauche conformation
step- growth/condensation polymerization
38. Softening agents
free radical
plasticizers
staggered conformation
freeze line
39. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
thermoplastics
degree of polymerization DPn
acrylic
40. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
quenching
plasticizers
rayon
isotactic dan
41. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
primary termination
viscose process
initiation
spinneret
42. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
configuration
polyamides
High volume thermoplastics HVTP
poly- p- phenylene benzobisoxazole PBO
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
relative molecular mass RMM
melt spinning
extruder
nylon
44. 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
polyamides
step- growth/condensation polymerization
propagation
polyesters
45. An acid and an alcohol
propagation
oligomers
most common condensation/step- growth polymerization occur between....
copolymer
46. Conformation that occurs when the largest substituent in a molecule are offset by 60
screen pack
gauche conformation
fillers
glass transition temperature Tg
47. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymers
polymer backbone
polyurethanes
quenching
48. One type of polymer that contains at least 85% of polyacrylonitrile PAN
structural unit
isotactic dan
acrylic
polymers
49. Covalently bonded chains of molecules with small monomer units repeated from end to end
shot size
asymetric
polymers
syndiotactic dyad
50. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
end groups
termination
any carbon with double bonds or repeated substituents