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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. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
trans - conformation
configuration
polyurethanes
2. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
block copolymers
rayon
termination
end groups
3. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
addition polymerization/chain growth/free- radical polymerization
mutual termination
gauche conformation
configuration
4. Carbon atom capable of multiple configurations due to four different substituents
freeze line
number average molecular weight Mn
asymetric
plasticizers
5. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
screen pack
constitution
plyacrylonitrile PAN
extruder
6. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
condensation/step- growth polymerization
fillers
vulcanization
syndiotactic dyad
7. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
pigments
termination
shot size
polyamides
8. Simple polymeric material produced as pellets in large quantities
thermoplastics
number average molecular weight Mn
relative molecular mass RMM
High volume thermoplastics HVTP
9. 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
aramid
stabilizers
quenching
melt spinning
10. 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
propagation
shot size
glass transition temperature Tg
plasticizers
11. Porcess of breaking large organic hydrocarbons into smaller molecules
secondary bonding
cracking
condensation/step- growth polymerization
vulcanization
12. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
elastomers
shot size
step- growth/condensation polymerization
13. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
step- growth/condensation polymerization
fillers
quenching
mutual termination
14. Is not asymetric and cannot have multiple configurations
quenching
melt spinning
any carbon with double bonds or repeated substituents
configuration
15. Two or more polymers mechanically mixed together but without covalent bonding between them
barrel
blends
polyurethanes
asymetric
16. Polymer that is made up a single repeat unit
homopolymer
tow
injection molding
initiation
17. Conformation in which the largest substituents are offset by 180
plasticizers
trans - conformation
isotactic dan
constitution
18. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
coloring agents
mutual termination
injection molding
19. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
trans - conformation
pigments
vulcanization
weight average molecular weight Mw
20. Low- molecular- weight building blocks repeated in the polymer chain
most common condensation/step- growth polymerization occur between....
petroleum
monomers
staggered conformation
21. Atoms attached to the polymer backbone.
secondary bonding
number average molecular weight Mn
fillers
side groups/ substituents
22. Polymers that contain amide (- N-) groups in the chain
High volume thermoplastics HVTP
blends
polyamides
number average molecular weight Mn
23. An acid and an alcohol
plyacrylonitrile PAN
most common condensation/step- growth polymerization occur between....
propagation
solution spinning
24. 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
thermoplastics
vulcanization
block copolymers
free radical
25. 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
atactic
propagation
solution spinning
end groups
26. Broad category of polymers that includes polymers containing urethane linkages
acrylic
step- growth/condensation polymerization
any carbon with double bonds or repeated substituents
polyurethanes
27. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
dyes
polyurethanes
functional groups
28. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
spinneret
freeze line
thermoplastics
plasticizers
29. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
acrylic
petroleum
most common condensation/step- growth polymerization occur between....
addition polymerization/chain growth/free- radical polymerization
30. 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
oligomers
cracking
screen pack
31. 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
asymetric
stabilizers
hopper
polyesters
32. 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
alternating copolymers
additives
elastomers
33. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
syndiotactic dyad
end groups
primary bonding
34. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
poly- p- phenylene benzobisoxazole PBO
functional groups
functionality
conformation
35. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
initiation
oligomers
isotactic dan
aramid
36. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
acrylic
constitution
staggered conformation
polyviyl chloride PVC
37. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
relative molecular mass RMM
polymers
atactic
structural unit
38. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
primary termination
trans - conformation
petroleum
stabilizers
39. 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
hopper
syndiotactic dyad
number average molecular weight Mn
termination
40. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
rayon
shot size
coloring agents
fillers
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
graft copolymers
monomers
polyamides
isotactic dan
42. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
configuration
secondary bonding
atactic
most common condensation/step- growth polymerization occur between....
43. 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
melt spinning
extruder
acrylic
44. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
degree of polymerization DPn
secondary bonding
random copolymers
plasticizers
45. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
constitution
plasticizers
tow
solution spinning
46. Polymer made up of two of more differenet monomers covalently bonded together
asymetric
oligomers
staggered conformation
copolymer
47. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
graft copolymers
poly- p- phenylene benzobisoxazole PBO
isotactic dan
gauche conformation
48. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
end groups
acrylic
tacticity
polymethylmethacrylate PMMA
49. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
thermosets
viscose process
most common condensation/step- growth polymerization occur between....
staggered conformation
50. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
mutual termination
eclipsed conformation/ cis - conformation
atactic
cracking