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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. 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
fillers
solution spinning
any carbon with double bonds or repeated substituents
relative molecular mass RMM
2. Conformation that occurs when the largest substituent in a molecule are offset by 60
plyacrylonitrile PAN
gauche conformation
viscose process
tacticity
3. 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
polyesters
die
branching
thermosets
4. 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
copolymer
plasticizers
graft copolymers
5. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
High volume thermoplastics HVTP
condensation/step- growth polymerization
freeze line
6. 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
glass transition temperature Tg
most common condensation/step- growth polymerization occur between....
end groups
isotactic dan
7. 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
hopper
polyurethanes
asymetric
melt spinning
8. 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
block copolymers
staggered conformation
homopolymer
9. Molecule containing a highly reactive unpaired electron
free radical
polypphenylene terephyhalamide PPTA
petroleum
degree of polymerization DPn
10. Arrangement of the largest substituents where the substituets are offset by 120
homopolymer
staggered conformation
initiation
thermoplastics
11. 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
structural unit
quenching
polymethylmethacrylate PMMA
12. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
condensation/step- growth polymerization
spinneret
polymethylmethacrylate PMMA
primary bonding
13. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
free radical
polymer backbone
nylon
extruder
14. 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
isotactic dan
cracking
coloring agents
weight average molecular weight Mw
15. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
eclipsed conformation/ cis - conformation
step- growth/condensation polymerization
thermoplastics
16. Polymers that contain amide (- N-) groups in the chain
polyamides
mutual termination
vinyl monomer
freeze line
17. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
any carbon with double bonds or repeated substituents
propagation
petroleum
shot size
18. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
blends
mutual termination
stabilizers
injection molding
19. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
termination
primary bonding
vinyl monomer
polypphenylene terephyhalamide PPTA
20. 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
most common condensation/step- growth polymerization occur between....
copolymer
mutual termination
shot size
21. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
most common condensation/step- growth polymerization occur between....
spinneret
coloring agents
random copolymers
22. Porcess of breaking large organic hydrocarbons into smaller molecules
alternating copolymers
weight average molecular weight Mw
freeze line
cracking
23. Covalently bonded chains of molecules with small monomer units repeated from end to end
initiation
relative molecular mass RMM
end groups
polymers
24. Coloring agents that do not dissolve into the polymer
fillers
pigments
weight average molecular weight Mw
step- growth/condensation polymerization
25. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
viscose process
block copolymers
thermoplastics
graft copolymers
26. Relative configuration of adjecent asymmetric carbons
cracking
weight average molecular weight Mw
nylon
tacticity
27. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
High volume thermoplastics HVTP
cracking
additives
polymer backbone
28. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
coloring agents
degree of polymerization DPn
hopper
29. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
branching
quenching
syndiotactic dyad
plasticizers
30. Additives whose primary purpose is to reduce the final cost of the product
copolymer
poly- p- phenylene benzobisoxazole PBO
fillers
polymer backbone
31. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
vulcanization
addition polymerization/chain growth/free- radical polymerization
polymers
32. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
aramid
primary termination
tacticity
end groups
33. Carbon atom capable of multiple configurations due to four different substituents
configuration
addition polymerization/chain growth/free- radical polymerization
stabilizers
asymetric
34. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
poly- p- phenylene benzobisoxazole PBO
melt spinning
primary bonding
35. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
extruder
conformation
termination
alternating copolymers
36. 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
vinyl monomer
glass transition temperature Tg
number average molecular weight Mn
melt spinning
37. Low- molecular- weight building blocks repeated in the polymer chain
stabilizers
secondary bonding
condensation/step- growth polymerization
monomers
38. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
atactic
side groups/ substituents
aramid
plasticizers
39. Conformation in which the largest substituents are offset by 180
tacticity
alternating copolymers
trans - conformation
aramid
40. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
addition polymerization/chain growth/free- radical polymerization
spinneret
polyviyl chloride PVC
eclipsed conformation/ cis - conformation
41. Softening agents
tow
plasticizers
block copolymers
hopper
42. 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
blends
coloring agents
step- growth/condensation polymerization
acrylic
43. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
isotactic dan
atactic
freeze line
hopper
44. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
oligomers
polyviyl chloride PVC
condensation/step- growth polymerization
High volume thermoplastics HVTP
45. 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
blends
die
conformation
thermoplastics
46. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
thermoplastics
syndiotactic dyad
coloring agents
47. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
degree of polymerization DPn
spinneret
termination
weight average molecular weight Mw
48. Smallest repeating unit in a polymer. aka repeat unit
polyesters
structural unit
random copolymers
polyamides
49. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
polymers
rayon
tow
50. Number of bonds a molecule has formed
functionality
injection molding
cracking
coloring agents