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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. Polymer made up of two of more differenet monomers covalently bonded together
propagation
pigments
copolymer
step- growth/condensation polymerization
2. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
injection molding
solution spinning
pigments
3. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
nylon
spinneret
conformation
elastomers
4. Two or more polymers mechanically mixed together but without covalent bonding between them
conformation
melt spinning
blends
trans - conformation
5. First step in the process of polymerization - during which a free radical is formed
initiation
fillers
thermoplastics
condensation/step- growth polymerization
6. 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
plasticizers
blends
copolymer
polymers
7. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
staggered conformation
shot size
relative molecular mass RMM
stabilizers
8. Number of bonds a molecule has formed
fillers
functionality
rayon
functional groups
9. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
block copolymers
polymer backbone
plyacrylonitrile PAN
weight average molecular weight Mw
10. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
side groups/ substituents
asymetric
mutual termination
11. Smallest repeating unit in a polymer. aka repeat unit
shot size
blends
primary bonding
structural unit
12. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
condensation/step- growth polymerization
plasticizers
cracking
13. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
coloring agents
injection molding
screen pack
primary termination
14. Conformation in which the largest substituents are offset by 180
trans - conformation
any carbon with double bonds or repeated substituents
shot size
injection molding
15. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
tow
free radical
dyes
16. Broad category of polymers that includes polymers containing urethane linkages
copolymer
polyamides
eclipsed conformation/ cis - conformation
polyurethanes
17. One type of polymer that contains at least 85% of polyacrylonitrile PAN
any carbon with double bonds or repeated substituents
plasticizers
spinneret
acrylic
18. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
polyamides
aramid
stabilizers
petroleum
19. Low- molecular- weight building blocks repeated in the polymer chain
stabilizers
rayon
monomers
polyamides
20. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
tow
configuration
isotactic dan
free radical
21. 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
structural unit
number average molecular weight Mn
configuration
thermosets
22. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
conformation
structural unit
atactic
monomers
23. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
initiation
conformation
die
functionality
24. Double bounded organic molecule used to begin addition polymerization
stabilizers
extruder
polyamides
vinyl monomer
25. 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
step- growth/condensation polymerization
weight average molecular weight Mw
alternating copolymers
any carbon with double bonds or repeated substituents
26. 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
free radical
configuration
any carbon with double bonds or repeated substituents
27. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
atactic
plasticizers
termination
alternating copolymers
28. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
vinyl monomer
polypphenylene terephyhalamide PPTA
primary termination
29. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
rayon
plyacrylonitrile PAN
condensation/step- growth polymerization
copolymer
30. 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
quenching
elastomers
end groups
relative molecular mass RMM
31. Conformation that occurs when the largest substituent in a molecule are offset by 60
die
secondary bonding
gauche conformation
isotactic dan
32. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
branching
syndiotactic dyad
thermoplastics
initiation
33. Molecule containing a highly reactive unpaired electron
free radical
nylon
thermosets
stabilizers
34. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
blends
tacticity
addition polymerization/chain growth/free- radical polymerization
configuration
35. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
pigments
nylon
vulcanization
quenching
36. Additives whose primary purpose is to reduce the final cost of the product
homopolymer
stabilizers
fillers
branching
37. 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
branching
cracking
hopper
barrel
38. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
vulcanization
solution spinning
cracking
39. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
configuration
extruder
freeze line
condensation/step- growth polymerization
40. Polymers that contain amide (- N-) groups in the chain
configuration
acrylic
polyviyl chloride PVC
polyamides
41. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
polyesters
thermosets
acrylic
side groups/ substituents
42. Polymer that is made up a single repeat unit
structural unit
hopper
homopolymer
isotactic dan
43. An acid and an alcohol
viscose process
end groups
die
most common condensation/step- growth polymerization occur between....
44. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
polyesters
secondary bonding
random copolymers
termination
45. 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
High volume thermoplastics HVTP
atactic
most common condensation/step- growth polymerization occur between....
46. 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
injection molding
High volume thermoplastics HVTP
barrel
die
47. 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
functional groups
structural unit
termination
mutual termination
48. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
asymetric
acrylic
oligomers
thermoplastics
49. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
isotactic dan
addition polymerization/chain growth/free- radical polymerization
acrylic
random copolymers
50. Primary raw material for most polymers
cracking
petroleum
freeze line
poly- p- phenylene benzobisoxazole PBO