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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. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
freeze line
petroleum
propagation
secondary bonding
2. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
plasticizers
staggered conformation
additives
secondary bonding
3. Low- molecular- weight building blocks repeated in the polymer chain
trans - conformation
injection molding
propagation
monomers
4. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
injection molding
die
freeze line
propagation
5. Primary raw material for most polymers
petroleum
tow
primary bonding
degree of polymerization DPn
6. 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
functional groups
homopolymer
plasticizers
7. Atoms attached to the polymer backbone.
side groups/ substituents
functional groups
gauche conformation
screen pack
8. Polymer made up of two of more differenet monomers covalently bonded together
plasticizers
hopper
polypphenylene terephyhalamide PPTA
copolymer
9. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
coloring agents
atactic
propagation
block copolymers
10. 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
syndiotactic dyad
stabilizers
spinneret
number average molecular weight Mn
11. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
glass transition temperature Tg
copolymer
vulcanization
injection molding
12. 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
mutual termination
eclipsed conformation/ cis - conformation
pigments
tow
13. Is not asymetric and cannot have multiple configurations
blends
mutual termination
any carbon with double bonds or repeated substituents
polyurethanes
14. 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
cracking
plasticizers
polyurethanes
15. Polymer that is made up a single repeat unit
copolymer
asymetric
homopolymer
plasticizers
16. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
oligomers
viscose process
addition polymerization/chain growth/free- radical polymerization
constitution
17. Double bounded organic molecule used to begin addition polymerization
plyacrylonitrile PAN
vinyl monomer
secondary bonding
polypphenylene terephyhalamide PPTA
18. Two or more polymers mechanically mixed together but without covalent bonding between them
polyviyl chloride PVC
petroleum
number average molecular weight Mn
blends
19. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
dyes
melt spinning
cracking
primary termination
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
glass transition temperature Tg
addition polymerization/chain growth/free- radical polymerization
step- growth/condensation polymerization
polyesters
21. Carbon atom capable of multiple configurations due to four different substituents
plasticizers
configuration
pigments
asymetric
22. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
initiation
freeze line
poly- p- phenylene benzobisoxazole PBO
copolymer
23. Polymers that contain amide (- N-) groups in the chain
step- growth/condensation polymerization
tacticity
any carbon with double bonds or repeated substituents
polyamides
24. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
staggered conformation
polymethylmethacrylate PMMA
weight average molecular weight Mw
25. Molecule containing a highly reactive unpaired electron
free radical
condensation/step- growth polymerization
polymers
syndiotactic dyad
26. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
termination
relative molecular mass RMM
primary bonding
dyes
27. Simple polymeric material produced as pellets in large quantities
spinneret
conformation
most common condensation/step- growth polymerization occur between....
High volume thermoplastics HVTP
28. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
thermoplastics
configuration
plyacrylonitrile PAN
copolymer
29. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
viscose process
tow
extruder
fillers
30. Covalent bonding of the polymer backbone and side groups
constitution
primary bonding
polymethylmethacrylate PMMA
polymer backbone
31. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
any carbon with double bonds or repeated substituents
dyes
functional groups
free radical
32. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
cracking
screen pack
additives
atactic
33. Porcess of breaking large organic hydrocarbons into smaller molecules
additives
fillers
cracking
polyamides
34. Conformation in which the largest substituents are offset by 180
polymethylmethacrylate PMMA
freeze line
trans - conformation
spinneret
35. 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
constitution
stabilizers
die
configuration
36. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
plyacrylonitrile PAN
eclipsed conformation/ cis - conformation
most common condensation/step- growth polymerization occur between....
degree of polymerization DPn
37. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
rayon
functionality
isotactic dan
38. 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
mutual termination
initiation
side groups/ substituents
block copolymers
39. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
any carbon with double bonds or repeated substituents
random copolymers
melt spinning
nylon
40. 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
tow
configuration
barrel
thermoplastics
41. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
additives
poly- p- phenylene benzobisoxazole PBO
coloring agents
42. Pigments or dyes that change the way light is absorbed or reflected by a polymer
pigments
additives
coloring agents
plyacrylonitrile PAN
43. An acid and an alcohol
coloring agents
side groups/ substituents
most common condensation/step- growth polymerization occur between....
polymethylmethacrylate PMMA
44. 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
solution spinning
shot size
branching
injection molding
45. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
conformation
homopolymer
block copolymers
46. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
polymer backbone
propagation
quenching
stabilizers
47. 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
stabilizers
weight average molecular weight Mw
tacticity
functionality
48. 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
polymethylmethacrylate PMMA
branching
polyviyl chloride PVC
petroleum
49. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
monomers
tow
side groups/ substituents
branching
50. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
staggered conformation
addition polymerization/chain growth/free- radical polymerization
quenching
side groups/ substituents