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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. Number of bonds a molecule has formed
polymethylmethacrylate PMMA
pigments
functionality
graft copolymers
2. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
glass transition temperature Tg
barrel
functionality
3. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
melt spinning
die
number average molecular weight Mn
propagation
4. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
conformation
weight average molecular weight Mw
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
5. Pigments or dyes that change the way light is absorbed or reflected by a polymer
solution spinning
coloring agents
addition polymerization/chain growth/free- radical polymerization
propagation
6. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
primary bonding
syndiotactic dyad
acrylic
die
7. Polymer that is made up a single repeat unit
homopolymer
elastomers
nylon
end groups
8. Relative configuration of adjecent asymmetric carbons
quenching
polymethylmethacrylate PMMA
solution spinning
tacticity
9. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
vulcanization
oligomers
polyviyl chloride PVC
10. Coloring agents that do not dissolve into the polymer
freeze line
cracking
pigments
random copolymers
11. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
oligomers
monomers
graft copolymers
gauche conformation
12. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
stabilizers
free radical
injection molding
13. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
petroleum
additives
quenching
rayon
14. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
block copolymers
pigments
polypphenylene terephyhalamide PPTA
functional groups
15. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
petroleum
trans - conformation
atactic
screen pack
16. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
primary termination
free radical
vulcanization
17. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
shot size
vinyl monomer
polymers
spinneret
18. 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
stabilizers
primary bonding
addition polymerization/chain growth/free- radical polymerization
19. Is not asymetric and cannot have multiple configurations
freeze line
any carbon with double bonds or repeated substituents
aramid
branching
20. 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
barrel
melt spinning
plasticizers
random copolymers
21. Low- molecular- weight building blocks repeated in the polymer chain
secondary bonding
vulcanization
monomers
branching
22. Broad category of polymers that includes polymers containing urethane linkages
plyacrylonitrile PAN
polyurethanes
shot size
random copolymers
23. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
poly- p- phenylene benzobisoxazole PBO
screen pack
weight average molecular weight Mw
thermosets
24. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
die
eclipsed conformation/ cis - conformation
dyes
functional groups
25. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
weight average molecular weight Mw
end groups
cracking
tow
26. Atoms attached to the polymer backbone.
conformation
configuration
side groups/ substituents
free radical
27. Primary raw material for most polymers
petroleum
isotactic dan
stabilizers
screen pack
28. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
thermosets
hopper
functionality
structural unit
29. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
polyurethanes
end groups
coloring agents
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
relative molecular mass RMM
High volume thermoplastics HVTP
vinyl monomer
freeze line
31. First step in the process of polymerization - during which a free radical is formed
eclipsed conformation/ cis - conformation
initiation
acrylic
aramid
32. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
vinyl monomer
functional groups
blends
33. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
oligomers
polymers
quenching
34. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
side groups/ substituents
poly- p- phenylene benzobisoxazole PBO
random copolymers
thermosets
35. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
additives
homopolymer
spinneret
vulcanization
36. Covalent bonding of the polymer backbone and side groups
primary bonding
petroleum
acrylic
elastomers
37. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
primary termination
alternating copolymers
constitution
screen pack
38. 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
number average molecular weight Mn
configuration
gauche conformation
oligomers
39. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
High volume thermoplastics HVTP
solution spinning
polymer backbone
40. 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
most common condensation/step- growth polymerization occur between....
aramid
polyesters
weight average molecular weight Mw
41. 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
polyurethanes
petroleum
most common condensation/step- growth polymerization occur between....
42. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
polypphenylene terephyhalamide PPTA
glass transition temperature Tg
end groups
43. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polypphenylene terephyhalamide PPTA
shot size
termination
polymer backbone
44. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
injection molding
polymers
primary bonding
45. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
trans - conformation
quenching
random copolymers
stabilizers
46. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
blends
isotactic dan
oligomers
47. 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
shot size
block copolymers
trans - conformation
condensation/step- growth polymerization
48. Porcess of breaking large organic hydrocarbons into smaller molecules
solution spinning
structural unit
plasticizers
cracking
49. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
poly- p- phenylene benzobisoxazole PBO
addition polymerization/chain growth/free- radical polymerization
configuration
dyes
50. 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
plyacrylonitrile PAN
barrel
isotactic dan
polyamides