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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. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
cracking
any carbon with double bonds or repeated substituents
polypphenylene terephyhalamide PPTA
propagation
2. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
constitution
copolymer
fillers
3. Polymer that is made up a single repeat unit
homopolymer
oligomers
elastomers
plasticizers
4. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
vulcanization
branching
solution spinning
5. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
thermosets
trans - conformation
syndiotactic dyad
vulcanization
6. Atoms attached to the polymer backbone.
fillers
elastomers
barrel
side groups/ substituents
7. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
graft copolymers
structural unit
monomers
freeze line
8. Relative configuration of adjecent asymmetric carbons
weight average molecular weight Mw
injection molding
free radical
tacticity
9. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polyviyl chloride PVC
die
quenching
number average molecular weight Mn
10. Smallest repeating unit in a polymer. aka repeat unit
structural unit
polyesters
spinneret
polyamides
11. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
staggered conformation
vulcanization
end groups
asymetric
12. 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
polymethylmethacrylate PMMA
oligomers
staggered conformation
13. One type of polymer that contains at least 85% of polyacrylonitrile PAN
structural unit
gauche conformation
acrylic
plyacrylonitrile PAN
14. Covalent bonding of the polymer backbone and side groups
tow
primary termination
copolymer
primary bonding
15. 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
propagation
weight average molecular weight Mw
injection molding
relative molecular mass RMM
16. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
functionality
additives
degree of polymerization DPn
cracking
17. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
relative molecular mass RMM
oligomers
screen pack
hopper
18. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
degree of polymerization DPn
oligomers
primary bonding
19. First step in the process of polymerization - during which a free radical is formed
monomers
initiation
acrylic
degree of polymerization DPn
20. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
tow
coloring agents
aramid
High volume thermoplastics HVTP
21. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
primary bonding
screen pack
vinyl monomer
eclipsed conformation/ cis - conformation
22. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
conformation
atactic
poly- p- phenylene benzobisoxazole PBO
23. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
mutual termination
staggered conformation
syndiotactic dyad
thermoplastics
24. 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
block copolymers
constitution
atactic
glass transition temperature Tg
25. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
extruder
random copolymers
secondary bonding
copolymer
26. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
quenching
monomers
constitution
alternating copolymers
27. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
functional groups
spinneret
polymers
28. Two or more polymers mechanically mixed together but without covalent bonding between them
plasticizers
blends
coloring agents
aramid
29. 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
tow
syndiotactic dyad
primary termination
condensation/step- growth polymerization
30. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
random copolymers
fillers
barrel
31. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
cracking
vulcanization
free radical
32. Low- molecular- weight building blocks repeated in the polymer chain
polyviyl chloride PVC
monomers
cracking
block copolymers
33. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
staggered conformation
plasticizers
polymethylmethacrylate PMMA
dyes
34. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
pigments
elastomers
configuration
functional groups
35. Number of bonds a molecule has formed
oligomers
petroleum
functionality
melt spinning
36. 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
die
rayon
spinneret
side groups/ substituents
37. Carbon atom capable of multiple configurations due to four different substituents
asymetric
melt spinning
plasticizers
glass transition temperature Tg
38. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
polyurethanes
syndiotactic dyad
propagation
any carbon with double bonds or repeated substituents
39. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
secondary bonding
termination
step- growth/condensation polymerization
40. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
degree of polymerization DPn
polymethylmethacrylate PMMA
primary bonding
oligomers
41. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
fillers
rayon
secondary bonding
tow
42. Molecule containing a highly reactive unpaired electron
end groups
random copolymers
vinyl monomer
free radical
43. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
quenching
polymers
fillers
44. Covalently bonded chains of molecules with small monomer units repeated from end to end
eclipsed conformation/ cis - conformation
configuration
polyviyl chloride PVC
polymers
45. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
degree of polymerization DPn
configuration
pigments
shot size
46. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
alternating copolymers
shot size
block copolymers
plyacrylonitrile PAN
47. 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
weight average molecular weight Mw
branching
block copolymers
polyesters
48. Polymers that contain amide (- N-) groups in the chain
staggered conformation
condensation/step- growth polymerization
polyamides
addition polymerization/chain growth/free- radical polymerization
49. 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
glass transition temperature Tg
aramid
structural unit
melt spinning
50. 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
gauche conformation
barrel
freeze line
plasticizers