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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. Polymers that contain amide (- N-) groups in the chain
polyamides
fillers
conformation
barrel
2. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
degree of polymerization DPn
atactic
asymetric
3. 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
functional groups
trans - conformation
barrel
isotactic dan
4. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
nylon
copolymer
barrel
oligomers
5. 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
end groups
termination
solution spinning
functional groups
6. Low- molecular- weight building blocks repeated in the polymer chain
structural unit
staggered conformation
hopper
monomers
7. Atoms attached to the polymer backbone.
side groups/ substituents
polyurethanes
coloring agents
monomers
8. Pigments or dyes that change the way light is absorbed or reflected by a polymer
acrylic
alternating copolymers
nylon
coloring agents
9. Covalent bonding of the polymer backbone and side groups
weight average molecular weight Mw
quenching
acrylic
primary bonding
10. Coloring agents that do not dissolve into the polymer
polyamides
addition polymerization/chain growth/free- radical polymerization
weight average molecular weight Mw
pigments
11. First step in the process of polymerization - during which a free radical is formed
extruder
initiation
structural unit
coloring agents
12. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
barrel
dyes
pigments
isotactic dan
13. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
elastomers
isotactic dan
injection molding
quenching
14. An acid and an alcohol
end groups
stabilizers
aramid
most common condensation/step- growth polymerization occur between....
15. 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
eclipsed conformation/ cis - conformation
die
structural unit
asymetric
16. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
weight average molecular weight Mw
oligomers
vulcanization
constitution
17. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
any carbon with double bonds or repeated substituents
free radical
shot size
functional groups
18. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
alternating copolymers
quenching
pigments
end groups
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
injection molding
primary termination
thermoplastics
additives
20. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
injection molding
extruder
polypphenylene terephyhalamide PPTA
mutual termination
21. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
polyesters
syndiotactic dyad
barrel
nylon
22. 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
melt spinning
initiation
cracking
monomers
23. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
block copolymers
polyamides
rayon
freeze line
24. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
configuration
freeze line
asymetric
secondary bonding
25. 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
screen pack
dyes
configuration
number average molecular weight Mn
26. 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
oligomers
viscose process
condensation/step- growth polymerization
hopper
27. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
shot size
termination
oligomers
petroleum
28. Carbon atom capable of multiple configurations due to four different substituents
condensation/step- growth polymerization
aramid
asymetric
glass transition temperature Tg
29. 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
addition polymerization/chain growth/free- radical polymerization
any carbon with double bonds or repeated substituents
step- growth/condensation polymerization
melt spinning
30. 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
staggered conformation
extruder
tow
polyesters
31. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plasticizers
spinneret
plyacrylonitrile PAN
solution spinning
32. 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
weight average molecular weight Mw
plasticizers
structural unit
staggered conformation
33. Conformation in which the largest substituents are offset by 180
spinneret
blends
vinyl monomer
trans - conformation
34. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
configuration
functionality
vulcanization
35. Porcess of breaking large organic hydrocarbons into smaller molecules
thermosets
plyacrylonitrile PAN
cracking
staggered conformation
36. Softening agents
coloring agents
graft copolymers
plasticizers
shot size
37. Covalently bonded chains of molecules with small monomer units repeated from end to end
shot size
additives
polymers
plasticizers
38. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
structural unit
poly- p- phenylene benzobisoxazole PBO
polyurethanes
conformation
39. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
spinneret
eclipsed conformation/ cis - conformation
condensation/step- growth polymerization
initiation
40. Relative configuration of adjecent asymmetric carbons
eclipsed conformation/ cis - conformation
homopolymer
dyes
tacticity
41. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
functionality
polymethylmethacrylate PMMA
polyamides
42. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
shot size
functionality
propagation
43. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
constitution
alternating copolymers
syndiotactic dyad
tow
44. 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
aramid
solution spinning
isotactic dan
atactic
45. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
graft copolymers
spinneret
shot size
initiation
46. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
asymetric
step- growth/condensation polymerization
isotactic dan
aramid
47. 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
viscose process
extruder
branching
functionality
48. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
petroleum
hopper
polyviyl chloride PVC
polypphenylene terephyhalamide PPTA
49. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
polyamides
end groups
nylon
plasticizers
50. Double bounded organic molecule used to begin addition polymerization
blends
tacticity
vinyl monomer
polymer backbone