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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. Two or more polymers mechanically mixed together but without covalent bonding between them
injection molding
stabilizers
blends
side groups/ substituents
2. 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
quenching
staggered conformation
plasticizers
thermosets
3. Number of bonds a molecule has formed
extruder
functionality
melt spinning
poly- p- phenylene benzobisoxazole PBO
4. 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
barrel
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
stabilizers
5. 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
cracking
plasticizers
High volume thermoplastics HVTP
isotactic dan
6. Simple polymeric material produced as pellets in large quantities
polyamides
High volume thermoplastics HVTP
end groups
conformation
7. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
alternating copolymers
monomers
stabilizers
hopper
8. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
spinneret
barrel
propagation
shot size
9. 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
structural unit
plyacrylonitrile PAN
primary termination
10. Polymer that is made up a single repeat unit
homopolymer
die
glass transition temperature Tg
freeze line
11. Carbon atom capable of multiple configurations due to four different substituents
isotactic dan
block copolymers
glass transition temperature Tg
asymetric
12. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
graft copolymers
polyviyl chloride PVC
acrylic
functional groups
13. 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
gauche conformation
poly- p- phenylene benzobisoxazole PBO
polyviyl chloride PVC
condensation/step- growth polymerization
14. Primary raw material for most polymers
petroleum
configuration
cracking
alternating copolymers
15. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
dyes
aramid
addition polymerization/chain growth/free- radical polymerization
16. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polypphenylene terephyhalamide PPTA
copolymer
constitution
quenching
17. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
relative molecular mass RMM
petroleum
viscose process
mutual termination
18. 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
copolymer
block copolymers
step- growth/condensation polymerization
19. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
pigments
number average molecular weight Mn
alternating copolymers
polypphenylene terephyhalamide PPTA
20. Polymers that contain amide (- N-) groups in the chain
barrel
polyamides
constitution
melt spinning
21. Polymer made up of two of more differenet monomers covalently bonded together
coloring agents
oligomers
copolymer
primary bonding
22. Covalent bonding of the polymer backbone and side groups
initiation
poly- p- phenylene benzobisoxazole PBO
atactic
primary bonding
23. 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
elastomers
weight average molecular weight Mw
vulcanization
viscose process
24. One type of polymer that contains at least 85% of polyacrylonitrile PAN
gauche conformation
cracking
acrylic
condensation/step- growth polymerization
25. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
structural unit
elastomers
plyacrylonitrile PAN
26. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
step- growth/condensation polymerization
random copolymers
atactic
27. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
rayon
petroleum
graft copolymers
vinyl monomer
28. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
polymer backbone
random copolymers
relative molecular mass RMM
die
29. 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
poly- p- phenylene benzobisoxazole PBO
number average molecular weight Mn
vinyl monomer
block copolymers
30. Conformation that occurs when the largest substituent in a molecule are offset by 60
thermoplastics
polyviyl chloride PVC
thermosets
gauche conformation
31. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
nylon
relative molecular mass RMM
atactic
plyacrylonitrile PAN
32. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
weight average molecular weight Mw
acrylic
thermoplastics
degree of polymerization DPn
33. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
shot size
conformation
free radical
vinyl monomer
34. 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
melt spinning
propagation
glass transition temperature Tg
polyamides
35. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
tacticity
poly- p- phenylene benzobisoxazole PBO
polyurethanes
acrylic
36. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
plyacrylonitrile PAN
copolymer
free radical
additives
37. Porcess of breaking large organic hydrocarbons into smaller molecules
tacticity
cracking
extruder
relative molecular mass RMM
38. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
most common condensation/step- growth polymerization occur between....
fillers
plasticizers
secondary bonding
39. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
thermosets
mutual termination
step- growth/condensation polymerization
40. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
propagation
syndiotactic dyad
atactic
viscose process
41. 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
plasticizers
polymer backbone
polyesters
42. An acid and an alcohol
graft copolymers
most common condensation/step- growth polymerization occur between....
trans - conformation
elastomers
43. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
propagation
condensation/step- growth polymerization
number average molecular weight Mn
44. 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
quenching
block copolymers
tacticity
end groups
45. Softening agents
tacticity
plasticizers
thermosets
acrylic
46. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
primary bonding
side groups/ substituents
trans - conformation
47. 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
conformation
primary termination
melt spinning
thermosets
48. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
hopper
staggered conformation
die
49. Broad category of polymers that includes polymers containing urethane linkages
structural unit
polyurethanes
constitution
plasticizers
50. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
side groups/ substituents
plyacrylonitrile PAN
trans - conformation